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IN WITNESS WHEREOF, the parties hereto have executed and delivered this
Amendment as of the date first written above.

 
RADNET MANAGEMENT, INC.
       
By:
/s/ Howard G. Berger
 
Name:  
Howard G. Berger, M.D.
 
Title:
President
             
RADNET, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
BEVERLY RADIOLOGY MEDICAL GROUP III
       
By: ProNet Imaging Medical Group, Inc., its general partner
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
By: Beverly Radiology Medical Group, Inc., its general partner
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
PRONET IMAGING MEDICAL GROUP, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President

 

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BEVERLY RADIOLOGY MEDICAL GROUP, INC.
       
By:
/s/ Howard G. Berger
 
Name: 
Howard G. Berger, M.D.
 
Title:
President
             
RADNET SUB, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
SO CAL MR SITE MANAGEMENT, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
RADNET MANAGEMENT I, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
RADNET MANAGEMENT II, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
RADNET MANAGED IMAGING
 
SERVICES, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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DIAGNOSTIC IMAGING SERVICES, INC.
       
By:
/s/ Howard G. Berger
 
Name: 
Howard G. Berger, M.D.
 
Title:
President
             
RADIOLOGIX, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
ADVANCED IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
IDE IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
MID ROCKLAND IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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PACIFIC IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name: 
Howard G. Berger, M.D.
 
Title:
President
             
QUESTAR IMAGING, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
TREASURE COAST IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
COMMUNITY IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
RADIOLOGY AND NUCLEAR MEDICINE IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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VALLEY IMAGING PARTNERS, INC.
       
By:
/s/ Howard G. Berger
 
Name:  
Howard G. Berger, M.D.
 
Title:
President
             
QUESTAR DULUTH, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
QUESTAR LOS ALAMITOS, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
QUESTAR VICTORVILLE, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President
             
ROCKY MOUNTAIN OPENSCAN MRI, LLC
       
By:
   
Name:
   
Title:
 

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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FRI, INC.
       
By:
/s/ Howard G. Berger
 
Name:  
Howard G. Berger, M.D.
 
Title:
President
             
FRI II, INC.
       
By:
/s/ Howard G. Berger
 
Name:
Howard G. Berger, M.D.
 
Title:
President

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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GENERAL ELECTRIC CAPITAL
 
CORPORATION,
 
as Agent and a Lender
       
By:
/s/ General Electric Capital Corporation
   
Duly Authorized Signatory

 
 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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[INSERT NAME OF LENDER], as a Lender
       
By:
   
Name:
   
Title:
 

 
Signature Page to Amendment No. 4 to Second Lien Credit Agreement

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