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Acasa arrow Echipamente medicale arrow Diagnostic Imaging QA arrow CT arrow Phantoms arrow Spiral/Helical CT Lesion Detectability Phantom
 




Spiral/Helical CT Lesion Detectability Phantom




The CT Lesion Detectability Phantom is particularly useful to physicians, CT technologists, and medical physicists who design scanning protocols for abdominal, pelvic, and brain CT.

It allows users to test various scanning protocols to verify that small low contrast lesions will be detected. This is the only way to be sure that a CT scanner is “seeing” tumors that are known to be present. The use of this phantom removes any doubt as to the limit of low contrast spherical lesion detectability for various scan protocols.

Applications
The phantom is designed to permit complete testing of low contrast lesion detection when various scan or image reconstruction parameters are varied. These include collimation, pitch, reconstructed field of view, reconstruction algorithm, z-axis (patient’s long axis) interpolators, kVp, mA, and rotation time. This lesion detectability testing can be applied to protocols designed for imaging of the liver, spleen, pancreas, kidneys, and adrenal glands. It can also be used for mass detection in the brain.
  • Incorporates clinically-relevant lesion shape (spherical) and size
  • Provides clinically-relevant absolute HU values for soft tissue
  • Provides a clinically-relevant HU differential (i.e. tumors have a slightly lower HU than background)
The CT Lesion Detectability Phantom is a tissue-equivalent test object that consists of an 18 cm diameter right circular cylinder with a CT value of 50 HU at 120 kVp. Within the phantom is an 18 cm diameter, 4 cm deep right circular void in which a soft-tissue equivalent disk (containing low contrast spheres) can be placed. The cylindrical void is in a plane containing the z-axis of the scanner. The soft-tissue-equivalent disk also has a background CT value of 50 HU. Embedded within the disk are three sets of simulated spherical lesions. One set is 5 HU below background, a second set is 10 HU below background, and the last set is 20 HU below background. Each set contains one sphere each of the following diameters: 2.4, 3.2, 4.0, 4.8, 6.3 and 9.5 mm. These diameters were chosen to encompass the full range of clinically significant lesions. The disk can also be placed at the end of the phantom when axial scanning detectability testing is desired.
  • Designed for use on all conventional and spiral (helical) CT scanners
  • Compact, rugged
  • Features three cylindrical reference plugs made of the same material as the spherical lesions
  • Valid for x-ray energies from 80 to 140 kVp
  • Background Hounsfield Units (HU) approximate liver tissue
  • Contains clinically-relevant sphere sizes of 2.4, 3.2, 4.0, 4.8, 6.3 and 9.5 mm in diameter
  • Spheres are 5, 10, and 20 HU below background HU
  • Carrying case is designed for use as a phantom support during scanning procedure






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