A Novel Approach to Contamination Suppression in Transmission Detectors for Radiotherapy
A Novel Approach to Contamination Suppression in Transmission Detectors for Radiotherapy
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DOI：
10.1109/trpms.2020.2995059
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发表时间：
2020-09-01
影响因子：
4.4
通讯作者：
Pritchard, J.
中科院分区：
文献类型：
--
作者：
Beck, L.;Velthuis, J. J.;Pritchard, J.
X 射线放射治疗的当前趋势是使用具有复杂强度分布的光束来治疗体内困难部位的癌症。调强放射治疗（IMRT）是一种改善肿瘤剂量分布同时减少健康组织剂量的治疗方法。此类治疗每次治疗部分施用较大剂量，因此需要更复杂的方法来验证治疗递送的准确性。测量光束强度波动很困难，因为光束在离开患者后会严重扭曲，并且透射探测器会衰减光束并改变光束的能谱。单片有源像素传感器 (MAPS) 是理想的固态探测器，用于测量患者上游放射治疗光束的 2-D 光束轮廓。 MAPS 传感器可以做得非常薄（类似于 30 μm），但信噪比性能仍然非常好。这意味着光束几乎不受干扰地穿过传感器（
The current trend in X-ray radiotherapy is to treat cancers that are in difficult locations in the body using beams with a complex intensity profile. Intensity-modulated radiotherapy (IMRT) is a treatment which improves the dose distribution to the tumor whilst reducing the dose to healthy tissue. Such treatments administer a larger dose per treatment fraction and hence require more complex methods to verify the accuracy of the treatment delivery. Measuring beam intensity fluctuations is difficult as the beam is heavily distorted after leaving the patient and transmission detectors will attenuate the beam and change the energy spectrum of the beam. Monolithic active pixel sensors (MAPSs) are ideal solid-state detectors to measure the 2-D beam profile of a radiotherapy beam upstream of the patient. MAPS sensors can be made very thin (similar to 30 mu m) with still very good signal-to-noise performance. This means that the beam would pass through the sensor virtually undisturbed (