QUASAR GRID3D Image Distortion Analysis System Aug 23, 2011

The QUASAR GRID3D Image Distortion Analysis System is designed to evaluate image distortion in 3D MR images for stereotactic radiosurgery (SRS). The System is comprised of a phantom and analysis software which work together to produce a 3D map of spatial distortion with submillimeter accuracy throughout a volume of interest. The GRID3D System ensures that MR imaging can support the outstanding geometric precision and dosimetric accuracy of the Leksell Gamma Knife®, including PERFEXION™.

DICOM images of the phantom (axial or coronal MR, as well as CT) are imported from the scanner into the software. The software automatically finds the fiducials and locates each of the 2002 vertex locations within the phantom in 3D. These locations are known to within 0.1 mm.

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