Characterize Geometric Accuracy for MR Use in Treatment Planning: The MR SRS Distortion Phantom is useful for verifying image fusion and deformable image registration algorithms used in various treatment planning systems. The anthropomorphic, tissue-equivalent design closely matches clinical imaging scenarios.
Tissue-Equivalent Anthropomorphic Head: The skull is made of a plastic-based trabecular bone substitute, and the interstitial and surrounding soft tissues are made of a proprietary signal-generating water-based polymer. The entire phantom is encased in a clear plastic shell to protect the gel from desiccation. Specially designed pads allow attachment to any stereotactic frame or mounting fixture for end-to-end testing. The phantom is also suitable for frameless stereotactic QA.
Detailed Intercranial 3D Design: The entire intercranial portion of the skull volume is filled with an orthogonal 3D grid of 2.5 mm diameter cross-shaped rods spaced 10 mm (IS), 10.5 mm (AP), and 11 mm (LR). Extra material added at the grid intersections enhances the grid signal. Five extended-axis rods intersect at the grid reference origin. The end of each extended axis is equipped with CT/MRI markers, allowing precise positioning with lasers and co-registration of CT and MRI image sets. The phantom contains air voids on both sides that replicate the ear canals. These voids are used to assess common distortions encountered in clinical settings.
Automated Distortion Analysis in MRgRT: Used with MR grid phantoms, Distortion Check software quickly and automatically quantifies distortion in MR images. Simply scan the phantom, upload images, review reports and trend analysis, and export DICOM overlays. The software registers a real CAD or CT scan at the detected control points. Then, an interpolation is performed to generate 3D distortion vector fields. Results can be reported in a variety of output formats, including scatterplots, contour plots, box-and-whisker plots for trend analysis, and DICOM overlays that can be exported to third-party software.
Software Features: Quickly and automatically analyze complete MR data sets Optimized control point density to bring interpolation closer to linearity Easy-to-use cloud-based solution Detailed formatting in NEMA MS 12 standard recommendations Easily analyze and track multiple machines, image sequences, and phantoms Set specific distortion tolerance limits for different image sequences.
