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Acasa arrow Echipamente medicale arrow Diagnostic Imaging QA arrow CT arrow Phantoms arrow AAPM CT Performance Phantom
 




AAPM CT Performance Phantom




The increasing use of computed tomography (CT) as a diagnostic tool creates the need for an efficient means of evaluating the performance of the CT scanners now in use. Recognizing this requirement, the American Association of Physicists in Medicine established the AAPM Task Force on CT Scanner Phantoms. Its goals are to define CT scanner performance and present practical methods of performance testing through the utilization of special phantoms. This phantom design is based on the guidelines presented in Report #1 of the Task Force and approved by the AAPM.

The modular AAPM CT Performance Phantom offers the CT user a single system with which to measure nine performance parameters. This phantom permits the routine standardization of alignment, beam width, spatial uniformity, linearity/ contrast, spatial resolution, linespread, noise, size independence, and absorbed dose. All components of the phantom are housed in a compact, transparent tank which holds the system together in the correct orientation.

The phantom consists of an 8.50 inch diameter acrylic tank containing a beam-width insert, a spatial resolution and linespread block, a high-contrast insert, and a means for inserting alignment pins and/or TLD holders. Additionally, a 0.25 inch thick Teflon® band, positioned at the base of the tank and concentric to the 8 inch internal diameter, simulates human bone. Attached to the base of the tank is a low-contrast section with resealable cavities (from 1 to 0.125 inch diameter) which can be filled with a diluted dextrose or other appropriate solution to provide a low-contrast media. The optional external resolution and noise ring slides snugly over the outside diameter of the tank, allowing whole-body scanner systems to be evaluated.

This phantom evaluates:
  • Noise
  • Spatial resolution
  • Sensitivity (low contrast resolution)
  • Absorbed dose
  • Size dependence
  • Contrast scale
  • Slice thickness
  • Alignment
  • Linearity
  • Beamwidth

 







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