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Computed Tomography Quality Assurance Services

Associates in Medical Physics, LLC, (AMP), agrees to supply the following services:

  • Perform performance evaluation and compliance testing of each C.T unit with respect to the following:

  • Accuracy of positioning lasers/lights.
  • Slide thickness accuracy.
  • Table-incrementing accuracy.
  • Noise levels of the system in the Head and Body modes, and at various slice thicknesses.
  • Image uniformity of the system in the Head and Body modes.
  • High contrast resolution in the Head and Body modes, and at various slice thicknesses.
  • Low contrast resolution in the Head and Body modes, and at various slice thicknesses.
  • Determination of contrast scale (i.e., change in linear attenuation coefficient with C.T. number).
  • Determination of C.T. number linearity (i.e., establish constancy of contrast scale over the range of C.T. numbers of clinical interest).
  • Verify relative independence of absolute C.T. number of water with respect to subject size and kVp.
  • General image quality with regard to imaging artifacts.
  • General safety of the unit.

  • Perform dosimetry measurements of each C.T. unit with respect to the following:

  • Physical location in an acrylic phantom (32cm Body or 16cm Head)
  • kVp
  • mA
  • Scan time
  • Scan diameter
  • Slice width

  • Provide a typed report of all findings for use as a permanent record, in a format acceptable to JCAHO and AOA.



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