Alliance Imaging Completes Amendment to Credit Agreement.

ANAHEIM, Calif. -- Alliance Imaging, Inc. (NYSE:AIQ), a leading national provider of diagnostic imaging services, announced that it has amended its Credit Agreement effective December 19, 2005.

The amendment to the Credit Agreement contains the following provisions:

--The Company's maximum leverage ratio covenant as defined in the Credit Agreement was amended to a level not to exceed 4.00 to 1.00 as of the last day of any fiscal quarter until the expiration of the agreement. Prior to the fourth amendment, the Company's maximum leverage ratio covenant was 3.75 to 1.00 as of the last day of any fiscal quarter beginning March 31, 2006 to the expiration of the agreement.

--The amendment contains a maximum senior leverage ratio covenant as defined in the amendment to the Credit Agreement to a level not to exceed 3.00 to 1.00 as of the last day of any fiscal quarter.

--The amendment increased the Tranche C base rate margin from an annual rate of 1.25% to 1.50% and the Tranche C LIBOR margin from an annual rate of 2.25% to 2.50%. In connection with the amendment, the Company incurred an amendment fee of 12.5 basis points.

About Alliance Imaging

Alliance Imaging is a leading national provider of shared-service and fixed-site diagnostic imaging services, based upon annual revenue and number of systems deployed. Alliance provides imaging services primarily to hospitals and other healthcare providers on a shared and full-time service basis, in addition to operating a growing number of fixed-site imaging centers. The Company had 497 diagnostic imaging systems, including 350 MRI systems and 58 PET or PET/CT systems, and over 1,000 clients in 44 states at September 30, 2005.

This press release contains forward-looking statements. Readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date hereof. These statements involve risks and uncertainties that could cause actual results to differ materially from those projected. For a complete list of risks and uncertainties, please refer to the Risk Factor section of the Company's Form 10-K/A for the year ended December 31, 2004 filed with the Securities and Exchange Commission.