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AAPM CT Performance Phantom

AAPM CT Performance Phantom
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AAPM CT Performance Phantom.


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AAPM CT Performance Phantom.
Meets guidelines in AAPM Report #1 “Performance Evaluation and Quality Assurance of CT Scanners”

The AAPM CT Performance Phantom offers the user a single test object that measures ten distinct CT performance parameters.  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 utilization of particular phantoms.”

Measurement Capability
• Noise

• Sensitivity / Detectability

• Mechanical Alignment

• Beam Hardening

• Slice Thickness

• Size Independence

• Radiation Dose

• Spatial Uniformity

• HU Linearity

• Spatial Resolution & line spread Function

A CT number linearity insert, high contrast resolution insert and slice width insert are housed in an 8.5" diameter (21.6 cm) PMMA water tank with quick disconnect valves for ease of filling and draining between uses.  Also included is a 0.25" (0.64 cm) bone equivalent ring that can be fit over the inserts to evaluate the effects of beam hardening.

A contrast test object is adhered to the bottom of the tank that includes two rows of cavities from 1 to 0.125" diameter (2.54 to 0.32 cm).  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. 

AAPM CT Performance Phantom Includes: 
(1) Contrast Test Object (this option is only available with the purchase of the phantom body):  8.5" OD x 2.5" L (21.6 x 6.35 cm) solid acrylic equivalent disk block with 12 fillable cavities 2.25" deep (5.72 cm).  Two of each cavity with diameters: 1, 0.75", 0.50", 0.375", 0.25", and 0.125" (2.54, 1.9, 1.27, 0.95, 0.64, 0.32 cm), spaced twice their diameter apart from a center line.  Cavities can be easily filled from the outside with dextrose or sodium chloride solutions of various concentrations.

(1) CT Number Linearity Insert: 
7.5" OD x 2.5" L (19.05 x 6.35 cm) includes 1" diameter (2.54 cm) rods of polyethylene, PMMA (acrylic), polycarbonate, polystyrene, and nylon.  Density values (g/cc): polyethylene - 0.95, polystyrene - 1.05, nylon - 1.1, acrylic - 1.19, polycarbonate - 1.20.

(1) Resolution Insert:
7.5" OD x 2.5" L (19.05 x 6.35 cm) with acrylic equivalent test object with 8 sets of air thru holes (five holes per set): Diameter of holes is 1.75, 1.5, 1.25, 1.00, 0.75, 0.61, 0.50, and 0.40 mm. Distance between each hole equal to hole diameter.  Each row is 5 mm apart.  Insert also contains a 0.009" (0.023 cm) stainless steel wire positioned longitudinally for calculation of line spread function.

(1) Slice Thickness Insert:
7.5" OD x 3.5" L (19.05 x 8.89 cm) Contains three 0.02 x 1" (0.05 x 2.54 cm) aluminum strips angled at 45°, positioned on center and aligned vertically.

(1) Alignment Pin: 
0.25" diameter x 3" L (0.64 x 7.62 cm) aluminum pin with threaded attachment to housing cover plate.

(1) Bone Ring
7.65" ID x 0.2" wall thickness x 2.8" L (19.43 x 0.5 x 7.1 cm) cortical bone ring.  Fits over linearity, resolution and slice thickness insert to harden the beam.

User Guide
48 month warranty

Overall Dimensions:
 8.5" OD x 15.5" L (21.6 x 39.4 cm)
Empty Weight:  17.25 lb (7.9 kg)
Materials:  PMMA cast tubing 8.5" OD, 8" ID x 12.75" L (21.6 OD, 20.3 ID x 32.4 cm) with removable lid

Note:  For optional accessories see accessories tab.


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