Pelvis Phantom
The RQA Lab pelvis phantom is identical to the phantom designed by the RPC for use with NCI-sponsored clinical trials. It consists of a plastic shell that is shipped empty to the institution and is filled with water upon receipt.
The pelvis phantom includes bone-density femoral heads and is supplied with two inserts; one for imaging and the second for dosimetry. The imaging insert contains an imageable target and organs at risk, and is otherwise water filled. The dosimetry insert is uniform polystyrene (water-equivalent) and contains thermoluminescent dosimeters and radiochromic film. The user images the phantom with CT, plans the treatment and delivers the IMRT treatment to the phantom with the appropriate insert. The report specifies the absorbed dose at the center of the target, profiles along three axes and maps of the dose distribution in two planes in the region of the target volume. The measurements are compared with the institution’s treatment plan.
|
|
|
The left image is a cross-sectional diagram of the phantom. The right image shows the imaging insert (top left), the dosimetry insert (top right), the phantom (center), a CT slice of the phantom (bottom left) and a CT slice of a patient (bottom right). The phantom is designed to mimic the geometry and CT densities of a typical patient.
Paper:
David S. Followill, DeeAnn Radford Evans, Christopher Cherry, Andrea Molineu, Gary Fisher, William F. Hanson, and Geoffrey S. Ibbott