**Exhibit 31**

**CERTIFICATION**

I, Paul S. Viviano, certify that:

1.    I havereviewed this report on Form 10-Q of Alliance Imaging, Inc.;

2.    Based on myknowledge, this report does not contain any untrue statement of a material factor omit to state a material fact necessary to make the statements made, inlight of the circumstances under which such statements were made, notmisleading with respect to the period covered by this report;

3.    Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this report;

4.    Theregistrant’s other certifying officers and I are responsible for establishingand maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the registrant and we have:

a)           designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;

b)          evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

c)           disclosedin this report any change in the registrant’s internal control over financialreporting that occurred during the registrant’s most recent fiscal quarter (theregistrant’s fourth fiscal quarter in the case of an annual report) that hasmaterially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and;

5.    Theregistrant’s other certifying officers and I have disclosed, based on our mostrecent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board ofdirectors (or persons performing the equivalent function):

a)           allsignificant deficiencies and material weaknesses in the design or operation ofinternal controls over financial reporting which are reasonably to adverselyaffect the registrant’s ability to record, process, summarize and reportfinancial information; and

b)          any fraud, whether or not material,that involves management or other employees who have a significant role in theregistrant’s internal control over financial reporting.
| Dated: August 9, 2004 | /s/ Paul S.  Viviano                    |
|----------------------------|-----------------------------------------|
|                       | Paul S. Viviano                         |
|                       | *Chairman of the Board,*                |
|                       | *Chief Executive Officer and President* |

 

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**CERTIFICATION**

I, R. Brian Hanson,certify that:

1.    I have reviewed this report on Form 10-Qof Alliance Imaging, Inc.;

2.    Based on my knowledge, this report does notcontain any untrue statement of a material fact or omit to state a materialfact necessary to make the statements made, in light of the circumstances underwhich such statements were made, not misleading with respect to the periodcovered by this report;

3.    Based on myknowledge, the financial statements, and other financial information includedin this report, fairly present in all material respects the financialcondition, results of operations and cash flows of the registrant as of, andfor, the periods presented in this report;

4.    Theregistrant’s other certifying officers and I are responsible for establishingand maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and15d-15(e)) for the registrant and we have:

a)           designedsuch disclosure controls and procedures, or caused such disclosure controls andprocedures to be designed under our supervision, to ensure that materialinformation relating to the registrant, including its consolidatedsubsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;

b)          evaluatedthe effectiveness of the registrant’s disclosure controls and procedures andpresented in this report our conclusions about the effectiveness of thedisclosure controls and procedures, as of the end of the period covered by thisreport based on such evaluation; and

c)           disclosedin this report any change in the registrant’s internal control over financialreporting that occurred during the registrant’s most recent fiscal quarter (theregistrant’s fourth fiscal quarter in the case of an annual report) that hasmaterially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and;

5.    Theregistrant’s other certifying officers and I have disclosed, based on our mostrecent evaluation of internal control over financial reporting, to theregistrant’s auditors and the audit committee of the registrant’s board ofdirectors (or persons performing the equivalent function):

a)           allsignificant deficiencies and material weaknesses in the design or operation ofinternal controls over financial reporting which are reasonably to adverselyaffect the registrant’s ability to record, process, summarize and reportfinancial information; and

b)          any fraud, whether or not material,that involves management or other employees who have a significant role in theregistrant’s internal control over financial reporting.
| Dated: August 9, 2004 | /s/ R. Brian  Hanson           |
|----------------------------|--------------------------------|
|                       | R. Brian Hanson                |
|                       | *Executive Vice President and* |
|                       | *Chief Financial Officer*      |

 

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