QUASAR™ GRID3D
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Obtain full 3D Distribution of Geometric Distortion in Minutes ± Verify geometric accuracy of different MR pulse sequences ± Compatible with the Leksell Gamma Knife®, including PERFEXION™ ± Automated image analysis provides full 3D distortion map with submillimeter accuracy MR-GUIDED STEREOTACTIC RADIOSURGERY QA The QUASAR™ GRID3D Image Distortion Analysis System evaluates image distortion in 3D MR images for stereotactic radiosurgery. 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™. ANALYSIS SOFTWARE DICOM images of the phantom are imported into the software. These images can be axial or coronal MR, as well as CT. The software automatically finds the fiducials and a proprietary algorithm accurately determines the x, y, and z deviations of each vertex in the image. Users can then interrogate and, if necessary, edit the results vertex by vertex, as well as plane by plane throughout the region of interest. The results are displayed in a tabular form and in a 3D display. The software saves the analysis results and generates a report in Excel. The software runs on Windows XP, Vista and 7 operating systems. Above: GRID Image Distortion Analysis Report “What I like about the GRID3D system is the simplicity of its design and operation. In a matter of minutes I can obtain a full 3D distribution of geometric distortion. Fine-tuning an MR sequence is now an efficient undertaking, as opposed to a nearly endless chore of phantom preparation and image analysis.” - Ian Paddick, Consultant Physicist, Medical Physics Limited Above: GRID3D phantom in the Leksell Coordinate Frame G with MR Indicator Accuracy. Confidence. Specifications subject to change without notice and shall not be liable for any errors or omissions contained in this document. © 2012 Modus Medical Devices Inc. PDS10

Accuracy. Confidence. The phantom is an acrylic cube containing a 1 cm 3D grid of channels filled with copper sulfate solution. The region of interest measures 14 x 13 x 11 cm3 in which there are 2002 vertex locations. The vertex locations are known to within 0.1 mm. The phantom accurately and reproducibly mounts securely to the Leksell Coordinate Frame G at a known position. It fits within both the Leksell MR Indicator and Leksell CT Indicator. MINIMUM TECHNICAL REQUIREMENTS ± Standard desktop or laptop PC with Windows 7, Vista, or XP ± Minimum 110 Mbytes hard disk space required for...