van Gameren Frédérique P D, Borman Pim T S, van den Berg Cornelis A T, Cole Mike, Koenig Grant R, Fast Martin F, van Lier Astrid L H M W
University Medical Center Utrecht, Department of Radiotherapy, Utrecht, the Netherlands.
IBA Quasar, Modus Medical Devices, London, Ontario, Canada.
Phys Imaging Radiat Oncol. 2025 Mar 7;34:100742. doi: 10.1016/j.phro.2025.100742. eCollection 2025 Apr.
Dedicated motion compensated Magnetic Resonance Imaging (MRI) for radiotherapy treatment planning promises to mitigate motion effects on imaging. We demonstrate a novel insert for an MRI safe motion phantom, which enables quality assurance of these image strategies. The capability to analyse apparent slice thickness, positional accuracy and motion blur is demonstrated for scenarios with and without motion. A respiratory-compensated scan with a 4 mm trigger-window and 16 mm peak-to-peak (p2p) motion showed a +5.0% deviation from the nominal 2 mm slice thickness. In contrast, a non-compensated scan with 4 mm p2p motion showed a +77.5% deviation, illustrating the effectiveness of motion compensation.
用于放射治疗计划的专用运动补偿磁共振成像（MRI）有望减轻运动对成像的影响。我们展示了一种用于MRI安全运动体模的新型插件，它能够对这些成像策略进行质量保证。对于有运动和无运动的情况，都展示了分析表观切片厚度、位置精度和运动模糊的能力。在4毫米触发窗口和16毫米峰峰值（p2p）运动的呼吸补偿扫描中，与标称的2毫米切片厚度相比，偏差为+5.0%。相比之下，在4毫米p2p运动的非补偿扫描中，偏差为+77.5%，这说明了运动补偿的有效性。
