Document:

Exhibit
4.01

 

[FACE OF NOTE]

 

Unless this certificate is presented by an authorized
representative of The Depository Trust Company (55 Water Street, New York, New
York) to the issuer or its agent for registration of transfer, exchange or
payment, and any certificate issued is registered in the name of Cede & Co.
or such other name as requested by an authorized representative of The
Depository Trust Company and any payment is made to Cede & Co., ANY
TRANSFER, PLEDGE OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL since the registered owner hereof, Cede & Co., has an interest
herein.

 

	
  REGISTERED

  	
  CUSIP: 22541FDL7

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  PRINCIPAL AMOUNT:
  $19,245,000

  
	
  NO. 1

  	
   

  

 

 

CREDIT SUISSE
FIRST BOSTON (USA), INC.

ProNotes Linked to the Value of a Basket of
Commodities

due December 22, 2008

 

CREDIT SUISSE FIRST BOSTON (USA), INC., a Delaware
corporation (the “Company”, which term includes any successor corporation under
the Indenture hereinafter referred to), for value received, hereby promises to
pay to Cede & Co., or registered assigns, at the office or agency of the
Company in New York, New York, the Redemption Amount (as defined on the reverse
hereof) on the Maturity Date (as defined on the reverse hereof).

 

Reference is hereby made to the further provisions of
this Note set forth on the reverse hereof, which further provisions shall for
all purposes have the same effect as if set forth at this place.

 

This Note shall not be valid or become obligatory for
any purpose until the certificate of authentication hereon shall have been
manually signed by the Trustee under the Indenture referred to on the reverse
hereof.

 

This
Note will not pay interest.

 

F-1

 

IN
WITNESS WHEREOF, the Company has caused this Note to be duly executed under its
corporate seal.

 

	
   

  	
  CREDIT SUISSE FIRST BOSTON (USA), INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
  [SEAL]

  	
  By:

  	
  /s/ Peter Feeney 

  	
   

  
	
   

  	
   

  	
  Name: 

  	
  Peter Feeney

  
	
   

  	
   

  	
  Title:

  	
  Treasurer

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  CREDIT SUISSE FIRST BOSTON (USA), INC.

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Grace Koo 

  	
   

  
	
   

  	
   

  	
  Name:

  	
  Grace Koo

  
	
   

  	
   

  	
  Title:

  	
  Managing Director

  
					

 

 

CERTIFICATE OF AUTHENTICATION

 

This is one of the Securities of the series designated
therein referred to in the within-mentioned Indenture.

 

Dated:  December 21, 2005

 

	
   

  	
  JPMORGAN CHASE BANK,

  
	
   

  	
  as Trustee

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
   

  	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Tai B. Lee

  	
   

  
	
   

  	
   

  	
  Authorized Signatory

  
					

 

F-2

 

[REVERSE OF NOTE]

 

CREDIT SUISSE
FIRST BOSTON (USA), INC.

ProNotes Linked to the Value of a Basket of
Commodities

due December 22, 2008

 

This Note is one of a
duly authorized issue of debentures, notes, bonds or other evidences of
indebtedness of the Company (the “Securities”) of the series hereinafter
specified, all issued or to be issued under and pursuant to a senior indenture,
dated as of June 1, 2001 (the “Indenture”), between the Company and JPMorgan
Chase Bank, as trustee (the “Trustee”), to which Indenture and all indentures
supplemental thereto reference is hereby made for a description of the rights,
limitations of rights, obligations, duties and immunities thereunder of the
Trustee, the Company, and the Holders of the Securities.  The Securities may be issued in one or more
series, which different series may be issued in various aggregate principal amounts,
may mature at different times, may bear interest (if any) at different rates,
may be subject to different redemption provisions (if any), may be subject to
different sinking, purchase or analogous funds (if any) and may otherwise vary
as provided in the Indenture.  This Note
is one of a series designated as the ProNotes
Linked to the Value of a Basket of Commodities due December 22, 2008 (the
“Note”).

 

This Note will not pay interest.

 

This Note is payable in the manner, with the effect
and subject to the conditions provided in the Indenture.

 

If a payment date is not a Business Day as defined in
the Indenture at a place of payment, payment may be made at that place on the
next succeeding day that is a Business Day, and no interest shall accrue for
the intervening period.

 

The Indenture provides that, without prior notice to
any Holders, the Company and the Trustee may amend the Indenture and the
Securities of any series with the written consent of the Holders of a majority
in principal amount of the outstanding Securities of all series affected by
such amendment (all such series voting as one class), and the Holders of a
majority in principal amount of the outstanding Securities of all series
affected thereby (all such series voting as one class) may waive future
compliance by the Company with any provision of the Indenture or the Securities
of such series by written notice to the Trustee; provided that, without the
consent of each Holder of the Securities of each series affected thereby, an
amendment or waiver, including a waiver of past defaults, may not: (i) extend
the stated maturity of the Principal of, or any sinking fund obligation or any
installment of interest on, such Holder’s Security, or reduce the principal
amount thereof or the rate of interest thereon (including any amount in respect
of original issue discount), or any premium payable with respect thereto, or
adversely affect the rights of such Holder under any mandatory redemption or
repurchase provision or any right of redemption or repurchase at the option of
such Holder, or reduce the amount of the Principal of an Original Issue
Discount Security that would be due and payable upon an acceleration of the
maturity thereof or the amount thereof provable in bankruptcy, or change any
place of payment where, or the currency in which, any Security of such series
or any premium or the interest thereon is payable, or impair the right to
institute suit for the

 

R-1

 

enforcement of any such payment on or after the due date therefor; (ii)
reduce the percentage in principal amount of outstanding Securities of the
relevant series the consent of whose Holders is required for any such
supplemental indenture, for any waiver of compliance with certain provisions of
the Indenture or certain Defaults and their consequences provided for in the
Indenture; (iii) waive a Default in the payment of Principal of or interest on
any Security of such Holder; or (iv) modify any of the provisions of the
Indenture governing supplemental indentures with the consent of Securityholders
except to increase any such percentage or to provide that certain other
provisions of the Indenture cannot be modified or waived without the consent of
the Holder of each outstanding Security affected thereby.

 

The Indenture provides that, subject to certain
conditions, the Holders of at least a majority in principal amount (or, if any
Securities are Original Issue Discount Securities, such portion of the
Principal as is then accelerable) of the outstanding Securities of all series affected
(voting as a single class), by notice to the Trustee, may waive an existing
Default or Event of Default with respect to the Securities of such series and
its consequences, except a Default in the payment of Principal of or interest
on any Security or in respect of a covenant or provision of the Indenture which
cannot be modified or amended without the consent of the Holder of each
outstanding Security affected.  Upon any
such waiver, such Default shall cease to exist, and any Event of Default with respect
to the Securities of such series arising therefrom shall be deemed to have been
cured, for every purpose of the Indenture; but no such waiver shall extend to
any subsequent or other Default or Event of Default or impair any right
consequent thereto.

 

The Indenture provides that a series of Securities may
include one or more tranches (each a “tranche”) of Securities, including
Securities issued in a Periodic Offering. 
The Securities of different tranches may have one or more different
terms, including authentication dates and public offering prices, but all the
Securities within each such tranche shall have identical terms, including
authentication date and public offering price. 
Notwithstanding any other provision of the Indenture, subject to certain
exceptions, with respect to sections of the Indenture concerning the execution,
authentication and terms of the Securities, redemption of the Securities,
Events of Default of the Securities, defeasance of the Securities and amendment
of the Indenture, if any series of Securities includes more than one tranche,
all provisions of such sections applicable to any series of Securities shall be
deemed equally applicable to each tranche of any series of Securities in the
same manner as though originally designated a series unless otherwise provided
with respect to such series or tranche pursuant to a board resolution or a
supplemental indenture establishing such series or tranche.

 

No reference herein to the Indenture and no provision
of this Note or of the Indenture shall alter or impair the obligation of the
Company, which is absolute and unconditional, to pay the Redemption Amount of
this Note in the manner, at the place, at the time and in the coin or currency
herein prescribed.

 

The Securities are issuable initially only in
registered form without coupons in denominations of $10,000 or any integral
multiples of $1,000 in excess of that amount at the office or agency of the
Company in the Borough of Manhattan, The City of New York, and in the manner
and subject to the limitations provided in the Indenture.

 

R-2

 

The Securities will not be redeemable at the option of
the Company prior to maturity.

 

The Company will not be required to pay any Additional
Amounts on the Securities.

 

Maturity Date

 

The Maturity Date of the Securities is December 22, 2008 (the “Maturity Date”);
however, if a market disruption event exists on the final valuation date, as
determined by the Calculation Agent, the Maturity Date will be the later of
December 22, 2008 and the fifth
Business Day following the date on which the final basket level is calculated.

 

Redemption Amount

 

We will redeem the securities at maturity for a
redemption amount in cash that will equal the principal amount of the securities
multiplied by the sum of 1 plus the basket return.  The basket return will be based on the
difference between the final basket level and the initial basket level.  How the basket return will be calculated
depends on whether the final basket level is greater than or less than or equal
to the initial basket level:

 

•                  If
the final basket level is greater than the initial basket level, then the
basket return will equal:

 

	
   

  	
  final basket level - initial basket level

  
	
  180% *

  	
  initial basket level

  
	
   

  	
   

  

 

Thus, if the final basket level is greater than the
initial basket level, the basket return will be a positive number, and you will
receive more than the principal amount of your securities at redemption.

 

•                  If
the final basket level is less than or equal to the initial basket level, then
the basket return will be zero, and you will receive only the principal amount
of your securities at redemption.

 

For purposes of calculating the basket return, the
final basket level on the valuation date will be equal to the sum of:

 

(i) the product of (x) .07, the weighting of the
Aluminum component in the basket, and (y) the closing level of Aluminum on the
valuation date divided by 2250.00, the closing level of Aluminum on December
16, 2005, the date the securities are priced for initial sale to the public;

 

(ii) the product of (x) .07, the weighting of the
Copper component in the basket, and (y) the closing level of Copper on the
valuation date divided by 4624.50, the closing level of Copper on December 16,
2005, the date the securities are priced for initial sale to the public;

 

R-3

 

(iii) the product of (x) .15, the weighting of the
Crude Oil component in the basket, and (y) the closing level of Crude Oil on
the valuation date divided by 58.06, the closing level of Crude Oil on December
16, 2005, the date the securities are priced for initial sale to the public;

 

(iv) the product of (x) .05, the weighting of the Gold
component in the basket, and (y) the closing level of Gold on the valuation
date divided by 505.90, the closing level of Gold on December 16, 2005, the
date the securities are priced for initial sale to the public.

 

(v) the product of (x) .05, the weighting of the
Heating Oil component in the basket, and (y) the closing level of Heating Oil
on the valuation date divided by 173.20, the closing level of Heating Oil on
December 16, 2005, the date the securities are priced for initial sale to the
public;

 

(vi) the product of (x) .05, the weighting of the Lead
component in the basket, and (y) the closing level of Lead on the valuation
date divided by 1129.50, the closing level of Lead on December 16, 2005, the
date the securities are priced for initial sale to the public;

 

(vii) the product of (x) .10, the weighting of the
Natural Gas component in the basket, and (y) the closing level of Natural Gas
on the valuation date divided by 13.633, the closing level of Natural Gas on
December 16, 2005, the date the securities are priced for initial sale to the
public;

 

(viii)  the
product of (x) .06, the weighting of the Nickel component in the basket, and
(y) the closing level of Nickel on the valuation date divided by 13907.00, the
closing level of Nickel on December 16, 2005, the date the securities are
priced for initial sale to the public;

 

(ix) the product of (x) .05, the weighting of the
Unleaded Gasoline component in the basket, and (y) the closing level of
Unleaded Gasoline on the valuation date divided by 156.89, the closing level of
Unleaded Gasoline on December 16, 2005, the date the securities are priced for
initial sale to the public;

 

(x) the product of (x) .05, the weighting of the Zinc
component in the basket, and (y) the closing level of Zinc on the valuation
date divided by 1819.75, the closing level of Zinc on December 16, 2005, the
date the securities are priced for initial sale to the public;

 

(xi) the product of (x) .20, the weighting of the
GSCI-ER Agriculture Index component in the basket, and (y) the closing level of
GSCI-ER Agriculture Index on the valuation date divided by 59.688, the closing
level of GSCI-ER Agriculture Index on December 16, 2005, the date the
securities are priced for initial sale to the public; and

 

(xii) the product of (x) .10, the weighting of the
GSCI-ER Livestock Index component in the basket, and (y) the closing level of
GSCI-ER Livestock Index on the valuation date divided by 417.686, the closing
level of GSCI-ER Livestock Index on December 16, 2005, the date the securities
are priced for initial sale to the public.

 

R-4

 

The ‘‘initial basket level’’ equals 1.0.

 

The ‘‘closing level’’ for each underlying commodity
and commodity index will be the price of such underlying commodity or value of
such commodity index at such time as described below.

 

The price of “Aluminum” is the official settlement
price of the third Wednesday dated front month futures contract for one metric
ton of High Grade Primary Aluminum, stated in U.S. dollars, as determined by
the London Metal Exchange.

 

The price of “Copper” is the official settlement price
of the third Wednesday dated front month futures contract for one metric ton of
Copper, stated in U.S. dollars, as determined by the London Metal Exchange.

 

The price of “Crude Oil” is the official settlement
price for one barrel of the first nearby WTI light sweet crude oil futures
contract, stated in U.S. dollars, as determined by the New York Mercantile
Exchange.

 

The price of “Gold” is the official settlement price
for one fine troy ounce of the most active nearby refined Gold futures
contract, stated in U.S. dollars as determined by the COMEX Division of the New
York Mercantile Exchange.

 

The price of “Heating Oil” is the official settlement
price for one gallon of the first nearby fungible No. 2 heating oil futures
contract, stated in U.S. dollars, as determined by the New York Mercantile
Exchange.

 

The price of “Lead” is the official settlement price
of the third Wednesday dated front month futures contract for one metric ton of
Lead, stated in U.S. dollars, as determined by the London Metal Exchange.

 

The price of “Natural Gas” is the official settlement
price for one MMBTU of the first nearby Henry Hub natural gas futures contract,
stated in U.S. dollars, as determined by the New York Mercantile Exchange.

 

The price of “Nickel” is the official settlement price
of the third Wednesday dated front month futures contract for one metric ton of
Nickel, stated in U.S. dollars, as determined by the London Metal Exchange.

 

The price of “Unleaded Gasoline” is the official
settlement price for one gallon of the first nearby Phase II complex model
reformulated gasoline futures contract, stated in U.S. dollars, as determined
by the New York Mercantile Exchange.

 

The price of “Zinc” is the official settlement price
of the third Wednesday dated front month futures contract for one metric ton of
Special High Grade Zinc, stated in U.S. dollars, as determined by the London
Metal Exchange.

 

R-5

 

The price of the “GSCI-ER Agriculture Index” is the
value of the GSCI Agriculture Excess Return Index as published on Reuters.

 

The price of the “GSCI-ER Livestock Index” is the
value of the GSCI Livestock Excess Return Index as published on Reuters.

 

The “valuation date” will be December 17, 2008;
however, if the calculation agent determines that on the valuation date a
market disruption event exists, then the valuation date will be postponed to
the first succeeding business day on which the calculation agent determines
that no market disruption event exists, unless the calculation agent determines
that a market disruption event exists on each of the five business days
immediately following the valuation date. 
In that case, the fifth business day after the original valuation date
will be deemed to be the valuation date notwithstanding the existence of a
market disruption event, and the calculation agent will determine the basket
level for the valuation date on that fifth succeeding business day.

 

A ‘‘business day’’ is any day on which the relevant
futures contract or commodity index is published and on which the offices of
Goldman, Sachs & Co. in New York, New York are open for business.

 

A ‘‘market disruption event’’ is the occurrence on any
date or any number of consecutive dates of any one or more of the following
circumstances:  (a) the termination or
suspension of, or material limitation or disruption for at least two hours in
the trading of a commodity or a futures contract thereon included in the underlying
basket or any commodity or a futures contract thereon underlying the GSCI-ER
Livestock Index or GSCI-ER Agriculture Index that prevents the relevant
exchange on which such commodity is traded from establishing an official
settlement price for such commodity or contract as of a regularly scheduled
settlement time; (b) the settlement price for any commodity or a futures
contract thereon included in the underlying basket or commodity underlying the
GSCI-ER Livestock Index or GSCI-ER Agriculture Index is a ‘‘limit price,’’
which means that such settlement price for a day has increased or decreased
from the previous day’s settlement price by the maximum amount permitted under
applicable exchange rules; (c) failure by the applicable exchange or other
price source to announce or publish the settlement price for any commodity or a
futures contract thereon included in the underlying basket or commodity
underlying the GSCI-ER Livestock Index or the GSCI-ER Agriculture Index; and
(d) failure of Goldman, Sachs & Co. to publish the value for the GSCI-ER
Livestock Index or the GSCI-ER Agriculture Index, subject to certain
adjustments described below.

 

Market
Disruption Events

 

If the calculation agent determines that a market
disruption event exists in respect of a commodity included in the underlying basket
or the GSCI-ER Livestock Index or the GSCI-ER Agriculture Index (together the ‘‘basket
components’’), then the valuation date for such basket component will be
postponed to the first succeeding business day on which the calculation agent
determines that no market disruption event exists, unless the calculation agent
determines that a market disruption event exists on each of the five business
days immediately

 

R-6

 

following
the valuation date.  In that case, (a)
the fifth succeeding business day after the original valuation date will be
deemed to be the valuation date, notwithstanding the market disruption event,
and (b) the calculation agent will determine the settlement price for such
basket component in a commercially reasonable manner.  The valuation date for each basket component
not affected by a market disruption event will be the scheduled valuation date.

 

In the event that a market disruption event exists on
the valuation date, the maturity date of the securities will be the later of
December 22, 2008 and the fifth business day following the day on which the
final basket level is calculated.  No
interest or other payment will be payable because of any such postponement of
the maturity date.

 

Adjustments to the calculation of the
GSCI-ER Livestock Index or the GSCI-ER Agriculture Index

 

If either the GSCI-ER Livestock Index or the GSCI-ER
Agriculture Index is not calculated and announced by Goldman, Sachs & Co.
but (a) is calculated and announced by a successor acceptable to the
calculation agent or (b) is replaced by a successor index using, in the
determination of the calculation agent, the same or a substantially similar
formula for and method of calculation as used in the calculation of the GSCI-ER
Livestock Index or GSCI-ER Agriculture Index, as the case may be, then the
GSCI-ER Livestock Index or GSCI-ER Agriculture Index, as applicable, will be
deemed to be the index so calculated and announced by that successor sponsor or
that successor index, as the case may be.

 

Upon any selection by the calculation agent of a
successor index, the calculation agent will cause notice to be furnished to us
and the trustee, which will provide notice of the selection of the successor
index to the registered holders of the securities in the manner set forth
below.

 

If (x) on or prior to the valuation date Goldman,
Sachs & Co. makes, in the determination of the calculation agent, a
material change in the formula for or the method of calculating the GSCI-ER
Livestock Index or the GSCI-ER Agriculture Index or in any other way materially
modifies the GSCI-ER Livestock Index or the GSCI-ER Agriculture Index or (y) on
the valuation date Goldman, Sachs & Co. (or a successor sponsor) fails to
calculate and announce the GSCI-ER Livestock Index or the GSCI-ER Agriculture
Index and there is no comparable index available, then the calculation agent
will calculate the redemption amount using, in lieu of a published level for
the GSCI-ER Livestock Index or the GSCI-ER Agriculture Index, as the case may
be, the level for the index as on the valuation date as determined by the
calculation agent in accordance with the formula for and method of calculating
the GSCI-ER Livestock Index or the GSCI-ER Agriculture Index, as the case may be,
last in effect prior to that change or failure, but using only those
commodities that comprised the GSCI-ER Livestock Index or the GSCI-ER
Agriculture Index, as the case may be, immediately prior to that change or
failure.  Notice of adjustment of the GSCI-ER
Livestock Index or the GSCI-ER Agriculture Index will be provided by the
trustee in the manner set forth below.

 

All determinations made by the calculation agent will
be at the sole discretion of the calculation agent and will be conclusive for
all purposes and binding on us and the beneficial owners of the securities,
absent manifest error.

 

R-7

 

Events of
Default and Acceleration

 

In case an Event of Default (as defined in the
Indenture) with respect to the Securities shall have occurred and be
continuing, the amount declared due and payable upon any acceleration of the
Securities (in accordance with the acceleration provisions set forth in the
Indenture) will be determined by the Calculation Agent and will equal, for each
Note, the arithmetic average, as determined by the Calculation Agent, of the
fair value of the Securities as determined by at least three but not more than
five broker-dealers (which may include Credit Suisse First Boston LLC or any of
the Company’s other subsidiaries or affiliates) as will make such fair value
determination available to the Calculation Agent.

 

The Company, the Trustee and any agent of the Company
or the Trustee may deem and treat the registered Holder hereof as the absolute
owner of this Note (whether or not this Note shall be overdue and
notwithstanding any notation of ownership or other writing hereon) for the
purpose of receiving payment of, or on account of, the Redemption Amount
hereof, and for all other purposes, and neither the Company nor the Trustee nor
any agent of the Company or the Trustee shall be affected by any notice to the
contrary.

 

No recourse under or upon any obligation, covenant or
agreement contained in the Indenture or any indenture supplemental thereto or
in any Note, or because of any indebtedness evidenced thereby, shall be had
against any incorporator as such, or against any past, present or future
stockholder, officer, director or employee, as such, of the Company or of any
successor, either directly or through the Company or any successor, under any
rule of law, statute or constitutional provision or by the enforcement of any
assessment or by any legal or equitable proceeding or otherwise, all such
liability being expressly waived and released by the acceptance hereof and as
part of the consideration for the issue hereof.

 

The calculation agent for the Securities (the “Calculation
Agent”) is Credit Suisse First Boston International.  The calculations and determinations of the
Calculation Agent will be final and binding upon all parties (except in the
case of manifest error).  The Calculation
Agent will have no responsibility for good faith errors or omissions in its
calculations and determinations, whether caused by negligence or otherwise.

 

Terms used herein that are defined in the Indenture
and not otherwise defined herein shall have the respective meanings assigned
thereto in the Indenture.

 

The laws of the State of New York (without regard to
conflicts of laws principles thereof) shall govern this Note.

 

R-8

 

 FOR VALUE
RECEIVED, the undersigned hereby sell(s), assign(s) and transfer(s) unto

 

[PLEASE INSERT SOCIAL
SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE]

 

 

[PLEASE PRINT OR TYPE
NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE]

 

 

the within Note and all
rights thereunder, hereby irrevocably constituting and appointing

 

                                                                                                                                                                                           Attorney
to transfer such Note on the books of the Issuer, with full power of
substitution in the premises.

 

	
   

  	
  Signature:

  
	
   

  	
   

  
	
   

  	
   

  
	
  Dated:

  	
   

  	
   

  	
   

  
	
   

  	
  NOTICE:The signature to
  this assignment must correspond with the name as written upon the face of the
  within Note in every particular without alteration or enlargement or any
  change whatsoever.

  
				

 

R-9Exhibit 4.7

 

FOURTH AMENDMENT

 

DATED AS OF DECEMBER 19, 2005

 

TO

 

CREDIT AGREEMENT

 

DATED AS OF NOVEMBER 2, 1999

 

AMONG

 

ALLIANCE IMAGING, INC.,

 

as Borrower,

 

THE LENDERS LISTED HEREIN,

 

as Lenders,

 

DEUTSCHE BANK TRUST COMPANY AMERICAS,

 

as Administrative Agent,

 

CITICORP NORTH AMERICA, INC.,

 

as Syndication Agent,

 

and

 

LEHMAN BROTHERS COMMERCIAL PAPER INC.

 

and MERRILL LYNCH &CO.,

 

MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED

 

as Co-Documentation Agents

 

 

ALLIANCE IMAGING, INC.

FOURTH AMENDMENT

TO CREDIT AGREEMENT

 

This FOURTH AMENDMENT TO CREDIT
AGREEMENT (this “Amendment”)
is dated as of December 19, 2005 and entered into by and among Alliance
Imaging, Inc., a Delaware corporation (“Company”),
the financial institutions listed on the signature pages hereof (“Lenders”), Deutsche Bank Trust Company Americas, as
administrative agent for Lenders (“Administrative
Agent”), Citicorp North America, Inc.
as Syndication Agent (“Syndication Agent”),
Lehman Commercial Paper Inc. and Merrill Lynch & Co., Merrill Lynch,
Pierce, Fenner & Smith Incorporated as Co-Documentation Agents (each,
a “Co-Documentation Agent” and
collectively, “Documentation Agent”), Deutsche Bank Trust Company Americas, as collateral agent (“Collateral Agent”)
and, for purposes of Section 4 hereof, the Credit Support Parties (as
defined in Section 4 hereof) listed on the signature pages hereof,
and is made with reference to that certain Credit Agreement, dated as of November 2,
1999, as amended by that certain First Amendment dated as of May 11, 2000,
as further amended by that certain Second Amendment dated as of June 10,
2002, as further amended by that certain Third Amendment dated as of December 29,
2004 (as so amended, the “Credit Agreement”),
by and among Company, Lenders, Administrative Agent, Syndication Agent and
Documentation Agent.  Capitalized terms
used herein without definition shall have the same meanings herein as set forth
in the Credit Agreement.

 

RECITALS

 

WHEREAS,
Company and Lenders desire to amend the Credit Agreement on, and subject to,
the terms, conditions and agreements set forth herein, to modify certain
financial covenants set forth therein;

 

NOW, THEREFORE, in
consideration of the premises and the agreements, provisions and covenants
herein contained, the parties hereto agree as follows:

 

Section 1.                                          AMENDMENTS
TO THE CREDIT AGREEMENT

 

1.1                               Amendments
to Section 1:  Provisions Relating
to Defined Terms.

 

A.            Subsection 1.1
of the Credit Agreement is hereby amended by adding thereto the following
definitions, which shall be inserted in proper alphabetical order:

 

“Consolidated
Senior Leverage Ratio” means, as of the last day of any Fiscal
Quarter, the ratio of (i) Consolidated Senior Debt as of such date to (ii) Consolidated
Adjusted EBITDA of Company and its Subsidiaries for the four Fiscal Quarter
period ending on such date.

 

“Consolidated
Senior Debt” means Consolidated Total Debt minus (i) the
aggregate principal amount of Subordinated Indebtedness of Company and its
Subsidiaries, determined on a consolidated basis in accordance with GAAP and (ii) any
other Indebtedness of

 

1

 

Company and its Subsidiaries incurred from time to
time and subordinated in right of payment to the Obligations.

 

“Fourth
Amendment” means the Fourth
Amendment to the Credit Agreement, dated as of December 19, 2005, by and
among Company, Requisite Lenders, Collateral Agent, Syndication Agent,
Documentation Agent and Administrative Agent.

 

“Fourth
Amendment Effective Date”
means the date on which the Fourth Amendment became effective in accordance
with its terms.

 

B.            Subsection 1.1
of the Credit Agreement is hereby further amended by deleting the definitions
of “Applicable Tranche C Base Rate Margin”, “Applicable Tranche C LIBOR Margin”,
and “Consolidated Adjusted EBITDA” in their entirety, and substituting the
following therefore, respectively:

 

“Applicable
Tranche C Base Rate Margin” means with respect to any date of
determination on and after the Fourth Amendment Effective Date, a rate per
annum equal to 1.50%.

 

“Applicable
Tranche C LIBOR Margin” means with respect to any date of
determination on and after the Fourth Amendment Effective Date, a rate per
annum equal to 2.50%.

 

“Consolidated
Adjusted EBITDA” means, with respect to any Person for any period,
an amount equal to (i) Consolidated Net Income plus (ii) to
the extent the following items are deducted in calculating such Consolidated
Net Income, the sum, without duplication, of the amounts for such period of (a) Consolidated
Interest Expense, (b) taxes computed on the basis of income, (c) total
depreciation expense, (d) total amortization expense (including
amortization of deferred financing fees), (e) any expenses or charges
incurred in connection with any issuance of debt or equity Securities
(including upfront fees payable in respect of bank facilities), (f) any
restructuring charges or reserves, (g) any expenses or charges relating to
the Recapitalization, (h) any fees and expenses related to Acquisitions
and Investments permitted hereunder or acquisitions consummated prior to the
date hereof, (i) any other non-cash charges, (j) any deduction for
minority interest expense, (k) severance charges for such period, not to exceed
$750,000 for any one Fiscal Year and (l) any other non-recurring charges minus (iii) to
the extent the following items are added in calculating such Consolidated Net
Income, the sum, without duplication, of the amounts for such period of (a) any
non-recurring gains, and (b) any non-cash gains, all of the foregoing as
determined on a consolidated basis for such Person and its Subsidiaries in
conformity with GAAP; provided that, for purposes of subsections 7.6 and
7.7(ii) only, (X) Consolidated Adjusted EBITDA of any Included Pro Forma
Entity (other than any Unrestricted Subsidiary redesignated as a Subsidiary of
Company) shall be increased (if positive) or decreased (if negative) by any Pro
Forma Adjustment applicable thereto and (Y) Consolidated Adjusted EBITDA of
Company and its Subsidiaries shall be increased (if positive) or decreased (if
negative) by the Net EBITDA Adjustment.

 

2

 

1.2                               Amendments
to Subsection 7.6: Financial Covenants.

 

A.            Subsection 7.6B
is hereby amended by deleting the text of such subsection in its entirety
and by substituting therefor the following “Maximum
Leverage Ratio.  Company shall
not permit the Consolidated Leverage Ratio as of the last day of any Fiscal
Quarter ending on or after the Fourth Amendment Effective Date to exceed
4.00:1.00.”.

 

B.            Subsection 7.6
is hereby further amended by adding a new subparagraph (C) at the end
thereof as follows:

 

“C.          Maximum
Senior Leverage Ratio.  Company shall not permit the
Consolidated Senior Leverage Ratio as of the last day of any Fiscal Quarter
ending on or after the Fourth Amendment Effective Date to exceed 3.00:1.00.”.

 

1.3                               Amendments
to Exhibits.

 

A.            Exhibit IX
(Form of Compliance Certificate) to the Credit Agreement is hereby amended
by adding a new subparagraph (J) at the end of Attachment No. 1 thereto as
follows:

 

“J.           Maximum
Senior Leverage Ratio (as of                     ,
         )

 

	
  1.

  	
   

  	
  Consolidated Total Debt:

  	
   

  	
  $

  	
   

  
	
  2.

  	
   

  	
  Subordinated Indebtedness of Company and
  its Subsidiaries:

  	
   

  	
  $

  	
   

  
	
  3.

  	
   

  	
  Other Indebtedness of Company and its
  Subsidiaries subordinated in right of payment to the Obligations:

  	
   

  	
  $

  	
   

  
	
  4.

  	
   

  	
  Consolidated Senior Debt (J.1 minus
  J.2 minus J.3):

  	
   

  	
  $

  	
   

  
	
  5.

  	
   

  	
  Consolidated Adjusted EBITDA (F.15 above):

  	
   

  	
  $

  	
   

  
	
  6.

  	
   

  	
  Senior Leverage Ratio (J.4):(J.5):

  	
   

  	
   

  	
  :1.00

  	
   

  
	
  7.

  	
   

  	
  Maximum ratio permitted under
  subsection 7.6C:

  	
   

  	
  3.00

  	
  :1.00”.

  	
   

  

 

Section 2.                                          CONDITIONS
TO EFFECTIVENESS

 

This Amendment shall
become effective only upon the satisfaction of all of the following conditions
precedent (the date of satisfaction of such conditions being referred to herein
as the “Fourth Amendment Effective Date”) set
forth in this Section 2:

 

A.            Corporate Documents. 
On or before the Fourth Amendment Effective Date, Company shall, and
shall cause each other Credit Support Party to, deliver to Lenders (or to
Administrative Agent for Lenders with sufficient originally executed copies,
where appropriate, for each Lender and its counsel), with respect to Company or
such other Credit Support Party, as the case may be, Secretary’s Certificates,
in form and substance reasonably satisfactory to Administrative Agent and dated
the Fourth Amendment Effective Date, certifying that the signature and
incumbency certificate of Company and each other Credit Support Party as
delivered or reaffirmed to Administrative Agent on the Third Amendment
Effective Date, is in full force and effect.

 

3

 

B.            Fourth
Amendment. 
Administrative Agent shall have received from (a) the Requisite
Lenders, (b) Administrative Agent and (e) Company and the other
Credit Support Parties, a counterpart of this Amendment signed on behalf of
such party; and

 

C.            Amendment
Fee.  Company shall
have paid to Administrative Agent for the ratable benefit of each Lender that
shall have executed this Amendment on or prior to 5:00 PM New York City time on
December 19, 2005 (the “Consenting Lenders”)
an amendment fee equal to 12 1⁄2 basis points multiplied by the sum of the
aggregate principal amount of the outstanding Term Loans and Revolving Loan
Commitments held by the Consenting Lenders.

 

D.            Other
Fees.  Administrative
Agent shall have received any fees separately agreed upon between Company and
Administrative Agent.

 

E.             Completion of Proceedings. 
On or before the Fourth Amendment Effective Date, all corporate and
other proceedings taken or to be taken in connection with the transactions
contemplated hereby and all documents incidental thereto not previously found
acceptable by Administrative Agent, acting on behalf of Lenders, and its
counsel shall be satisfactory in form and substance to Administrative Agent and
such counsel, and Administrative Agent and such counsel shall have received all
such counterpart originals or certified copies of such documents as
Administrative Agent may reasonably request.

 

Section 3.                                          COMPANY’S
REPRESENTATIONS AND WARRANTIES

 

In order to induce
Lenders and Administrative Agent to enter into this Amendment and to amend the
Credit Agreement in the manner provided herein, Company represents and warrants
to Administrative Agent and each Lender that the following statements are true,
correct and complete:

 

A.            Corporate
Power and Authority. 
Each Loan Party has all requisite corporate, limited partnership or
limited liability company power and authority to enter into this Amendment and
to carry out the transactions contemplated by, and perform its obligations
under, the Credit Agreement as amended by this Amendment (the “Amended Agreement”).

 

B.            Authorization
of Agreements.  The
execution and delivery of this Amendment and the performance of the Amended
Agreement have been duly authorized by all necessary corporate, limited
partnership or limited liability company action on the part of each Loan Party,
as the case may be.

 

C.            No
Conflict.  The
execution and delivery by each Loan Party of this Amendment do not and will not
(i) violate any provision of any law or any governmental rule or
regulation applicable to such Loan Party, the Certificate or Articles of
Incorporation or other organizational documents or Bylaws of such Loan Party or
any order, judgment or decree of any court or other agency of government
binding on such Loan Party, (ii) conflict with, result in a breach of or
constitute (with due notice or lapse of time or both) a default under any
Contractual Obligation of such Loan Party, (iii) result in or require the
creation or

 

4

 

imposition
of any Lien upon any of the properties or assets of such Loan Party (other than
Liens created under any of the Loan Documents in favor of Collateral Agent on
behalf of Lenders), or (iv) require any approval of stockholders or any
approval or consent of any Person under any Contractual Obligation of such Loan
Party, except for such approvals or consents which have been obtained on or
before the Fourth Amendment Effective Date and disclosed in writing to Lenders.

 

D.            Governmental
Consents.  The
execution and delivery by each Loan Party of this Amendment and the performance
by such Loan Party of the Amended Agreement by the Company do not and will not
require any registration with, consent or approval of, or notice to, or other
action to, with or by, any federal, state or other governmental authority or
regulatory body.

 

E.             Binding
Obligation.  This
Amendment and the Amended Agreement have been duly executed and delivered by
each Loan Party party thereto and are the legally valid and binding obligations
of such Loan Party, enforceable against such Loan Party in accordance with
their respective terms, except as may be limited by bankruptcy, insolvency,
reorganization, moratorium or similar laws relating to or limiting creditors’
rights generally or by equitable principles relating to enforceability.

 

F.             Incorporation
of Representations and Warranties From Credit Agreement.  The representations and warranties contained
in Section 5 of the Amended Agreement are and will be true, correct and
complete in all material respects on and as of the Fourth Amendment Effective
Date to the same extent as though made on and as of that date, except to the
extent such representations and warranties specifically relate to an earlier
date, in which case they were true, correct and complete in all material
respects on and as of such earlier date.

 

G.            Absence
of Default.  No event
has occurred and is continuing or will result from the consummation of the
transactions contemplated by this Amendment that constitutes or would
constitute an Event of Default or a Potential Event of Default after giving
effect to this Amendment.

 

Section 4.                                          ACKNOWLEDGEMENT
AND CONSENT

 

Company is a party to the
Collateral Account Agreement, pursuant to which Company has created Liens in
favor of Administrative Agent on a certain deposit account of Company upon the
occurrence of an event stated therein; the Amended and Restated Pledge
Agreement, pursuant to which Company has affirmed, among other things, the
pledge to Collateral Agent for the benefit of Secured Parties of certain
capital stock and intercompany indebtedness owned by it to secure the Secured
Obligations; and the Security Agreement, pursuant to which Company has granted
Liens in favor of Collateral Agent on certain Collateral to secure the Secured
Obligations, in each case as amended through the Fourth Amendment Effective
Date.

 

Each Subsidiary Guarantor
is a party to the Subsidiary Guaranty pursuant to which such Subsidiary
Guarantor has guarantied the Obligations; the Amended and Restated Pledge

 

5

 

Agreement pursuant to which such Subsidiary Guarantor
has affirmed, among other things, the pledge to Collateral Agent for the
benefit of Secured Parties of certain capital stock and intercompany
indebtedness owned by it to secure the obligations of such Subsidiary Guarantor
under the Subsidiary Guaranty and Additional Debt (as defined in the Security
Agreement); and the Security Agreement pursuant to which such Subsidiary
Guarantor will grant Liens in favor of Collateral Agent on certain Collateral
to secure the obligations of such Subsidiary Guarantor under the Subsidiary
Guaranty and Additional Debt (as defined in the Security Agreement), in each
case as amended through the Fourth Amendment Effective Date.  Company and the Subsidiary Guarantors are
collectively referred to herein as the “Credit Support Parties”,
and the Collateral Account Agreement, the Amended and Restated Pledge Agreement
and the Security Agreement are collectively referred to herein as the “Credit Support Documents.”

 

Each Credit Support Party
hereby acknowledges that it has reviewed the terms and provisions of the Credit
Agreement and this Amendment and consents to the amendment of the Credit
Agreement effected pursuant to this Amendment. 
Each Credit Support Party hereby confirms that each Credit Support
Document to which it is a party or otherwise bound and all Collateral encumbered
thereby will continue to guaranty or secure, as the case may be, to the fullest
extent possible the payment and performance of all Secured Obligations, as the
case may be (in each case as such terms are defined in the applicable Credit
Support Document), including without limitation the payment and performance of
all such Secured Obligations, as the case may be, in respect of the Obligations
of Company now or hereafter existing under or in respect of the Amended
Agreement and the Notes defined therein. 
Each Credit Support Party acknowledges and agrees that any of the Credit
Support Documents to which it is a party or otherwise bound shall continue in
full force and effect and that all of its obligations thereunder shall be valid
and enforceable and shall not be impaired or limited by the execution or
effectiveness of this Amendment.  Each
Credit Support Party represents and warrants that all representations and
warranties contained in the Amended Agreement and the Credit Support Documents
to which it is a party or otherwise bound are true, correct and complete in all
material respects on and as of the date hereof to the same extent as though
made on and as of that date, except to the extent such representations and
warranties specifically relate to an earlier date, in which case they were true,
correct and complete in all material respects on and as of such earlier date.

 

Each Credit Support Party
(other than Company) acknowledges and agrees that (i) notwithstanding the
conditions to effectiveness set forth in this Amendment, such Credit Support Party
is not required by the terms of the Credit Agreement or any other Loan Document
to consent to the amendments to the Credit Agreement effected pursuant to this
Amendment and (ii) nothing in the Credit Agreement, this Amendment or any
other Loan Document shall be deemed to require the consent of such Credit
Support Party to any future amendments to the Credit Agreement.

 

6

 

Section 5.                                          MISCELLANEOUS

 

A.            Reference
to and Effect on the Credit Agreement and the Other Loan Documents.

 

(i)            On and after the
Fourth Amendment Effective Date, each reference in the Credit Agreement to “this
Agreement”, “hereunder”, “hereof”, “herein” or words of like import referring
to the Credit Agreement, and each reference in the other Loan Documents to the “Credit
Agreement”, “thereunder”, “thereof” or words of like import referring to the
Credit Agreement shall mean and be a reference to the Amended Agreement.

 

(ii)           Except as
specifically amended by this Amendment, the Credit Agreement and the other Loan
Documents shall remain in full force and effect and are hereby ratified and
confirmed.

 

(iii)          The execution,
delivery and performance of this Amendment shall not, except as expressly
provided herein, constitute a waiver of any provision of, or operate as a
waiver of any right, power or remedy of Administrative Agent or any Lender
under, the Credit Agreement or any of the other Loan Documents.

 

B.            Fees
and Expenses.  Payment
of all costs, fees and expenses as described in subsection 10.2 of the
Credit Agreement incurred by Administrative Agent or its counsel with respect
to this Amendment and the documents and transactions contemplated hereby shall
be paid by Company as agreed upon between Company and Agents.

 

C.            Headings.  Section and subsection headings in
this Amendment are included herein for convenience of reference only and shall
not constitute a part of this Amendment for any other purpose or be given any
substantive effect.

 

D.            Applicable
Law.  THIS AMENDMENT AND THE RIGHTS AND
OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE GOVERNED BY, AND SHALL BE
CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE INTERNAL LAWS OF THE STATE OF
NEW YORK (INCLUDING WITHOUT LIMITATION SECTION 5-1401 OF THE GENERAL
OBLIGATIONS LAW OF THE STATE OF NEW YORK), WITHOUT REGARD TO CONFLICTS OF LAWS
PRINCIPLES.

 

E.             Counterparts.  This Amendment may be executed in any number
of counterparts and by different parties hereto in separate counterparts, each
of which when so executed and delivered shall be deemed an original, but all
such counterparts together shall constitute but one and the same instrument;
signature pages may be detached from multiple separate counterparts and
attached to a single counterpart so that all signature pages are
physically attached to the same document.

 

[Remainder of
page intentionally left blank]

 

7

 

IN WITNESS WHEREOF, the parties hereto have caused this
Amendment to be duly executed and delivered by their respective officers
thereunto duly authorized as of the date first written above.

 

	
   

  	
  ALLIANCE
  IMAGING, INC.

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Howard K.
  Aihara

  	
   

  
	
   

  	
  Name:

  	
  Howard K. Aihara

  
	
   

  	
  Title:

  	
  Executive Vice
  President

  Chief Financial Officer

  

 

S-1

 

	
   

  	
  ALLIANCE IMAGING CENTERS, INC.

  ALLIANCE IMAGING MANAGEMENT, INC.

  ROYAL MEDICAL HEALTH SERVICES, INC.

  ALLIANCE IMAGING OF OHIO, INC.

  ALLIANCE IMAGING OF MICHIGAN, INC.

  MEDICAL CONSULTANTS IMAGING CO.

  ALLIANCE IMAGING NC, INC.

  MEDICAL DIAGNOSTICS, INC.

  WESTERN MASSACHUSETTS MAGNETIC RESONANCE SERVICES, INC.

  GREATER BOSTON MRI L.P.

  GREATER SPRINGFIELD MRI L.P.

  CURACARE, INC.

  AMERICAN SHARED-CURACARE

  SMT HEALTH SERVICES INC.

  MID-AMERICAN IMAGING, INC.

  RIA MANAGEMENT SERVICES, INC.

  GREATER BOSTON MRI SERVICES, INC.

  CENTRAL MASSACHUSETTS MRI SERVICES, INC.

  DIMENSIONS MEDICAL GROUP, INC.

  MERITUS PLS, INC.

  QUINCY MRI, L.P.

  THREE RIVERS HOLDING CORP.

  SOUTHEAST ARIZONA, INC.

  ALLIANCE MEDICAL IMAGING SOLUTIONS, LLC

  PET SCANS OF AMERICA CORP.

  ALLIANCE IMAGING FINANCIAL SERVICES, INC.

  NEW ENGLAND MOLECULAR IMAGING, LLC

   

   

  (for purposes of Section 4 only) as a Credit
  Support Party

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Howard K.
  Aihara

  	
   

  
	
   

  	
  Name:

  	
  Howard K. Aihara

  
	
   

  	
  Title:

  	
  Executive Vice
  President

  Chief Financial Officer

  

 

S-2

 

	
   

  	
  DEUTSCHE BANK TRUST COMPANY

  AMERICAS, individually and as Administrative

  Agent, Issuing Lender and Collateral Agent

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Diane F.
  Rolfe

  	
   

  
	
   

  	
  Name:

  	
  Diane F. Rolfe

  
	
   

  	
  Title:

  	
  Vice President

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Anca Trifan

  	
   

  
	
   

  	
  Name:

  	
  Anca Trifan

  
	
   

  	
  Title:

  	
  Director

  
					

 

S-3

 

	
   

  	
  CITICORP NORTH AMERICA, INC.,

  individually and as Syndication Agent and Lender

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ C. P. Mahon

  	
   

  
	
   

  	
  Name:

  	
  C. P. Mahon

  
	
   

  	
  Title:

  	
  Vice President

  

 

S-4

 

	
   

  	
  LEHMAN COMMERCIAL PAPER INC.,

  individually and as Co-Documentation Agent

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Craig Malloy

  	
   

  
	
   

  	
  Name:

  	
  Craig Malloy

  
	
   

  	
  Title:

  	
  Authorized
  Signatory

  

 

 

	
   

  	
  LEHMAN BROTHERS INC., individually and

  as Lender

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Craig Malloy

  	
   

  
	
   

  	
  Name:

  	
  Craig Malloy

  
	
   

  	
  Title:

  	
  Vice President

  

 

S-5

 

	
   

  	
  MERRILL LYNCH & CO.,

   

  MERRILL LYNCH, PIERCE, FENNER & SMITH
  INCORPORATED, as Co-Documentation Agent

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Michael E.
  O’Brien

  	
   

  
	
   

  	
  Name:

  	
  Michael E.
  O’Brien

  
	
   

  	
  Title:

  	
  Director

  

 

 

	
   

  	
  MERRILL LYNCH CAPITAL CORPORATION,

  as Lender

  
	
   

  	
   

  
	
   

  	
   

  
	
   

  	
  By:

  	
  /s/ Michael E.
  O’Brien

  	
   

  
	
   

  	
  Name:

  	
  Michael E.
  O’Brien

  
	
   

  	
  Title:

  	
  Vice President

  

 

S-6

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