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AAPM CT PERFORMANCE PHANTOM
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Meets guidelines in AAPM Report #1 “Performance Evaluation and Quality Assurance of CT Scanners”
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682-010
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AAPM CT Performance Phantom
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682-014
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Optional TLD Insert
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682-012
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Optional Low Contrast Insert
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682-013
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Optional Whole Body Resolution & Noise Ring
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682-015
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Optional Low Contrast Insert - Spherical Targets
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682-020
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Carrying Case
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Optional Accessories:
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Item 682-014 TLD Insert
0.5” dia. x 3.5” L PMMA rod drilled 3 inch deep to accept TLD’s. Can be swapped with Alignment pin in housing cover without removing the cover.
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Item 682-012 Low Contrast Insert
8” OD x 1.18” L propietary epoxy with CT density 6-10 HU above water. The test object contains a series of water-filled holes from 2.5 to 7.5mm in diameter, in 0.5mm steps. For each target size the center-to-center distance between holes is twice the hole diameter.
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Item 682-013 Whole Body Resolution and Noise Ring
12” OD x 8.5” ID x 2.5” L Fits over pahntom housing and contains the same test object as the Resolution Insert, at two locations 90° apart.
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Item 682-015 Low Contrast Insert- Spherical Targets
8” OD x 1.18” L liver equivalent background. The test object conatins spheres 5, 10 & 20 CTU below background and 3 reference plugs for each material used as spheres.
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Item 682-020 Foam-Lined Carrying Case
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Measurement Capability:
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• Noise
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• Size Independence
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• Sensitivity / Detectability
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• Radiation Dose
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• Mechanical Alignment
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• Spatial Uniformity
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• Beam Hardening
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• HU Linearity
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• Slice Thickness
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• Spatial Resolution & line spread function
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Specifications:
Overall Dimensions: 8.5” OD x 15.5” L
Empty Weight: 17.25 lb
Phantom Housing: PMMA cast tubing 8.5” ID x 12.75”L with removable lid
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.”
A CT number linearity insert, high contrast resolution insert and slice width insert are housed in an 8.5 “ diameter PMMA water tank with quick disconnect valves for ease of filling and draining between use. Also included is a 0.25” 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. 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.
A user’s manual, holding cradle, filling tubes and other accessories are included.
Optional items:Low contrast test object insert external whole-body resolution / noise ring or afoam lined carry case.
The AAPM CT Phantom INCLUDES following inserts:
• Contrast Test Object
(This option is only available with purchase of the phantom body)
805” OD x 2.5” L solid acrylic equivalent disk block with 12 fillable cavities 2.25” deep. Two of each cavity with diameters: 1, 0.75, 0.50, 0.375, 0.25, and 0.125 inches, spaced twice their diameter apart from a center line. Cavities can be easily filled from the ouside with dextrose or sodium chloride solutions of various concentration.
• CT Number Linearity Insert
7.5” OD x 2.5” L includes 1” diameter rods of polyethylene, PMMA, polycarbonate, polystyrene, and nylon. Density values (g/cc): polyethylene - 0.95, polystyrene - 1.05, nylon - 1.1, acrylic - 1.19, polycarbonate - 1.20.
• Resolution Insert
7.5” OD x 2.5” L 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” stainless steel wire positioned longitudinally for calculation of line0spread function.
• Slice Thickness Insert
7.5” OD x 3.5” L Contains three 0.025 x 1.00” aluminum strips angled at 45°, positioned on center and aligned vertically.
• Alignment Pin
0.25” diameter x 3” L aluminum pin with threaded attachement to housing cover plate.
• Bone Ring
7.65” ID x 0.2” wall thickness x 2.8” long cortical bone ring. Fits over linearity, resolution and slice thickness insert to harden the beam. |
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Radiation Products Design, Inc. www.rpdinc.com sales@rpdinc.com
763-497-2071 Fax 763-497-2295 5218 Barthel Industrial Drive Albertville, MN 55301
* * * * CLOSEOUT ITEMS * * * *
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