The Centers for Medicare and Medicaid Services and the Congress, through the Deficit Reduction Act of 2005, recently acted to constrain spending on imaging services, one of the fastest growing set of services under Medicare Part B, which covers physician and other outpatient services. This report provides information to help the Congress evaluate imaging services in Medicare. This report provides information on: (1) trends in Medicare spending on imaging services from 2000 through 2006; (2) the relationship between spending growth and the provision of imaging services in physicians¿ offices; and (3) imaging mgmt. practices used by private payers that may have lessons for Medicare. Includes recommendations. Illustrations.