A Phantom Based Laser Marking Workflow to Visually Assess Geometric Image Distortion in Magnetic Resonance Guided Radiotherapy
Physics and imaging in radiation oncology(2021)
摘要
Magnetic resonance (MR)-only workflows require quality assurance due to potential dosimetric impacts of using geometry distorted MR images in radiotherapy planning. MR-visible silicone-based fiducials were arranged in regular 3D structures to cover extended imaging volumes. The scanner's patient marking workflow with a 2-axes movable laser bridge allowed to visually check geometric distortions of each MR reconstructed fiducial against its true position in 3D space. A measurement resolution and uncertainty of the order of 0.5 mm in sagittal and coronal, and 1 mm in transversal direction was found. The proposed workflow required 1 min of evaluation time per fiducial position, and a 9 min 3D MR volume acquisition.
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关键词
Gradient nonlinearity,MR distortion correction,Lightweight plastic skeleton,Silicone-based spherical fiducials,External laser bridge,Patient marking workflow
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