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评估新的探测器读取模式,以减少kV图像上的MV散射

Ha Nguyen¹, Mathias Lehmann², Daniel Morf²

¹Department of Radiation Oncology, Stritch School of Medicine, Cardinal Bernadin Cancer Center, Loyola University Chicago, Maywood, Illinois, USA.

Medical physics

|March 27, 2025

概括

新的探测器读取模式显著减少了千伏 (kV) 成像期间的兆电压 (MV) 散射,改善了辐射治疗中运动监测的图像质量. 这些进步提高了对比度和噪声比率 (CNR),以更清晰地可视化瘤.

科学领域:

医学物理医学物理
放射治疗成像技术的成像技术
图像质量增强图像质量增强

背景情况:

在兆电压 (MV) 辐射期间同时进行千伏 (kV) 成像对于监测分数内运动至关重要.
MV散射降低了kV图像质量,使瘤在放射治疗期间的可视化复杂化.

研究的目的:

在Varian TrueBeam车载成像仪 (OBI) 上实现新的成像器读取模式.
在同时成像和照射期间减少MV散射对kV探测器的影响.

主要方法:

使用新的读取策略 (垂直分类,感兴趣的区域,脉冲下降功能) 来实现高率.
在MV幻影照射 (6FFF,10FFF) 期间采集的kV图像,具有不同的场大小和速率 (7-45fps).
评估散射效应和对比度与噪声比率 (CNR) 与仅kV数据相比.

主要成果:

MV散射与场大小平方和探测器集成时间成比例.
从7到45/秒的速增加,将MV散射率降低了高达87%.
在更高的率下,CNR提高了20% (2x2 cm2场) 到85% (10x10 cm2场).

结论:

新的探测器读取模式大大减少了kV探测器上的MV散射.
这些策略增强了CNR,从而提高了运动监控的图像质量.

关键词:

图像指导辐射疗法图像指导辐射疗法在fractional成像内进行成像.超大电压分散器在船上的成像仪上.辐射辐射辐射辐射的辐射

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