Oprax Medical Inc.

Radiosurgery Head Phantom.

Computerized Imaging Reference Systems, Inc! For Evaluation of Treatment Accuracy

The CIRS Radiosurgery Head Phantom was designed to improve the accuracy of treatment plan verification in radiosurgery. It allows for 3D dose verification in a large cranial volume.

The Phantom is manufactured from proprietary epoxy materials and contains brain, bone spinal cord, vertebral disks and soft tissue. Linear attenuations of the tissues are within 1% of actual attenuations from 50 keV to 25 MeV.

The standard 6.4 x 6.4 x 6.4 cm film stack contains 13 levels of X-ray or Gafchromic® film to evaluate accuracy of 3D dose distribution. It can be interchanged with an equivalent gel dosimetry cassette or TLD holder. Two brain-equivalent spacers allow the user to locate the cassette in one of four different positions.


  • Verification of intracranial dose distribution.
  • 3D isodose verification.
  • Commissioning and comparison of Treatment Planning Systems.
  • Verification of individual patient treatment plan.
  • Teaching tool for Gamma Knife and Radiosurgery.

  • Click Here to download ION Chamber Cavity Codes for Dosimetric Phantoms. (Fees apply.)


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    Radiosurgery Head