Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning

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http://hdl.handle.net/10138/328278

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Kavaluus , H , Nousiainen , K , Kaijaluoto , S , Seppälä , T , Saarilahti , K & Tenhunen , M 2021 , ' Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning ' , Physics and Imaging in Radiation Oncology , vol. 17 , pp. 58-64 . https://doi.org/10.1016/j.phro.2021.01.003

Title: Determination of acceptance criteria for geometric accuracy of magnetic resonance imaging scanners used in radiotherapy planning
Author: Kavaluus, Henna; Nousiainen, Katri; Kaijaluoto, Sampsa; Seppälä, Tiina; Saarilahti, Kauko; Tenhunen, Mikko
Contributor: University of Helsinki, Department of Physics
University of Helsinki, HUS Medical Imaging Center
University of Helsinki, HUS Comprehensive Cancer Center
University of Helsinki, HUS Comprehensive Cancer Center
University of Helsinki, HUS Comprehensive Cancer Center
Date: 2021-01
Language: eng
Number of pages: 7
Belongs to series: Physics and Imaging in Radiation Oncology
ISSN: 2405-6316
URI: http://hdl.handle.net/10138/328278
Abstract: Background and Purpose: Magnetic resonance imaging is increasingly used in radiotherapy planning; yet, the performance of the utilized scanners is rarely regulated by any authority. The aim of this study was to determine the geometric accuracy of several magnetic resonance imaging scanners used for radiotherapy planning, and to establish acceptance criteria for such scanners. Materials and Methods: The geometric accuracy of five different scanners was measured with three sequences using a commercial large-field-of-view phantom. The distortion magnitudes were determined in spherical volumes around the scanner isocenter and in cylindrical volumes along scanner z-axis. The repeatability of the measurements was determined on a single scanner with two quality assurance sequences with three single-setup and seven repeated-setup measurements. Results: For all scanners and sequences except one, the mean and median distortion magnitude was Conclusions: All tested scanners were geometrically accurate for their current use in radiotherapy planning. The acceptance criteria of geometric accuracy for regulatory inspections of a supervising authority could be set according to these results.
Subject: 3122 Cancers
114 Physical sciences
Radiotherapy planning
Magnetic resonance imaging
Quality assurance
Regulatory inspections
RADIATION-THERAPY
QUALITY-ASSURANCE
MRI SIMULATION
DISTORTION
SOCIETY
IMPACT
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