Image-based retrospective 4D MRI in external beam radiotherapy: A comparative study with a digital phantom

Medical Physics
Chiara PaganelliMarco Riboldi

Abstract

Several image-based retrospective sorting methods of 4D magnetic resonance imaging (4D MRI) have been proposed for respiratory motion reconstruction in external beam radiotherapy. However, the optimal strategy for providing accurate and artifact-free 4D MRI, ideally corresponding to an average breathing cycle, is not yet defined. This study presents a proactive comparison of three published image-based sorting methods, to define a groundwork for benchmarking in 4D MRI. Three published 4D MRI methods were selected for image retrospective sorting: body area, mutual information, and navigator slice. The three image-based methods were compared against a conventional retrospective sorting method based on an external surrogate. Comparisons were performed by means of an MRI digital phantom, derived from the XCAT CT phantom generated with different patient-derived signals, for a total of 12 cases. Specific multislice MRI acquisitions were simulated for slice sorting and sagittal, coronal, and axial orientations were tested. An average 4D cycle was generated as ground truth. Individual and grouped patient analyses showed better performance of the navigator slice and mutual information in amplitude binning with respect to the body area s...Continue Reading

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Citations

Nov 28, 2019·Physics in Medicine and Biology·R J M NavestC A T van den Berg
Aug 29, 2019·Physics in Medicine and Biology·P T S BormanM Glitzner
Jul 31, 2020·Frontiers of Medicine·Ke Sheng
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Jul 20, 2019·Physics in Medicine and Biology·C PaganelliG Baroni
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Mar 28, 2021·Journal of Medical Imaging and Radiation Oncology·Giorgia MeschiniGuido Baroni

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