Optimization of a novel large field of view distortion phantom for MR-only treatment planning

Journal of Applied Clinical Medical Physics
Ryan G PriceCarri K Glide-Hurst

Abstract

MR-only treatment planning requires images of high geometric fidelity, particularly for large fields of view (FOV). However, the availability of large FOV distortion phantoms with analysis software is currently limited. This work sought to optimize a modular distortion phantom to accommodate multiple bore configurations and implement distortion characterization in a widely implementable solution. To determine candidate materials, 1.0 T MR and CT images were acquired of twelve urethane foam samples of various densities and strengths. Samples were precision-machined to accommodate 6 mm diameter paintballs used as landmarks. Final material candidates were selected by balancing strength, machinability, weight, and cost. Bore sizes and minimum aperture width resulting from couch position were tabulated from the literature (14 systems, 5 vendors). Bore geometry and couch position were simulated using MATLAB to generate machine-specific models to optimize the phantom build. Previously developed software for distortion characterization was modified for several magnet geometries (1.0 T, 1.5 T, 3.0 T), compared against previously published 1.0 T results, and integrated into the 3D Slicer application platform. All foam samples provided su...Continue Reading

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Citations

Feb 2, 2018·Journal of Applied Clinical Medical Physics·Tarraf TorfehNoora Al-Hammadi
Mar 7, 2019·Medical Physics·Siamak P Nejad-DavaraniCarri Glide-Hurst
Mar 1, 2019·Physics in Medicine and Biology·Robba RaiGary P Liney
Nov 10, 2017·Medical Physics·Hervé Saint-JalmesGiulio Gambarota
Feb 3, 2018·Physics in Medicine and Biology·Amir M OwrangiCarri K Glide-Hurst
Jun 13, 2020·Physics in Medicine and Biology·Jordan M SlagowskiJihong Wang

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Software Mentioned

ITK
MATLAB Slicer
MATLAB
Qt
Ingenia
VTK
DICOM
GNL
FMRIB Software Library ( FSL )
FMRIB

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