Workflow Step

The AAPM CT Performance Phantom offers users a single test object that measures ten distinct CT performance parameters.

Performance Evaluation and Quality Assurance of CT Scanners

The phantom design is based on the guidelines presented in Report #1 of the American Association of Physicists in Medicine Task Force on CT Scanner Phantoms. The goals of report #1 were to “(1) define ‘performance’ of a CT scanner and (2) describe methods of performance testing through the utilization of particular phantoms.”

CT Performance Parameters

A contrast test object is adhered to the bottom of the tank that includes two rows of cavities from 1 to 0.125” diameter. The cavities can be filled with various solutions for contrast evaluation. An aluminum alignment insert is incorporated in the lid of the tank and can be interchanged with a polystyrene TLD insert for dose measurements.

Contrast Test Object

CT Number Linearity Insert

Resolution Insert

Slice Thickness Insert

Alignment Pin

Low Contrast Insert

Low Contrast Insert Spherical Targets


AAPM CT Performance Phantom


21.6 cm x 39.4 cm (8.5" OD x 15.5" L)

Empty Weight

7.8 kg (17.25 lbs.)


PMMA cast tubing 21.6 cm OD, 20.3 cm ID x 32.4 cm L (8.5" OD, 8" ID x 12.75" L) with removable lid