A miniature "scintillator-fiberoptic-PMT" detector system for the dosimetry of small fields in stereotactic radiosurgery
A miniature "scintillator-fiberoptic-PMT" detector system for the dosimetry of small fields in stereotactic radiosurgery
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DOI：
10.1109/23.940133
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发表时间：
2001-06-01
影响因子：
1.8
通讯作者：
Sibata, CH
中科院分区：
文献类型：
--
作者：
Beddar, AS;Kinsella, TJ;Sibata, CH
基于线性加速器的立体定向放射外科是治疗局部颅内异常的重要方式，通常是治疗某些病变的唯一选择。由于治疗野（通常为5-30 min准直野）的尺寸较小以及目前可用的探测器类型，因此对该模式输送的吸收辐射剂量进行量化一直是一项挑战。本文介绍了使用微型（1.6 × 10（-3）cm（3））塑料闪烁体探测器与常用探测器进行的剂量测量比较，用于立体定向放射外科的小光子场剂量测定。将塑料闪烁体探测器的空间分辨率与p型Si二极管和0.1 cm（3）电离室的空间分辨率进行了比较。本文介绍了使用闪烁探测器、0.1 cm（3）电离室、p型硅二极管和射线照相胶片的小野剂量测定参数（射束剖面、百分深度剂量和剂量输出因子）。这项比较研究表明，设计一个微型闪烁体探测器系统是可行的，当与其他基准探测器相比，是一个适当的探测器的小立体定向放射外科光子场的剂量测定。
Linear accelerator-based stereotactic radiosurgery is an important modality in the management of localized intracranial abnormalities and often is the only option for treatment of certain lesions. The quantification of the absorbed radiation doses delivered for this modality has been a challenge due to the small size of the treatment fields (typically 5-30 min collimated fields) and the type of detectors presently available. This paper presents comparative dose measurements performed using a miniature (1.6 x 10(-3) cm(3)) plastic scintillator detector to the commonly used detectors for the dosimetry of small photon fields used for stereotactic radiosurgery. The spatial resolution of the plastic scintillator detector was compared to that of a p-type Si diode and a 0.1-cm(3) ionization chamber. Small field dosimetry parameters (beam profiles, percent depth doses, and dose output factors) using the scintillation detector, the 0.1-cm(3) ionization chamber, the p-type Si diode, and radiographic film are presented. This comparative study shows that designing a miniature scintillator detector system is feasible and when compared to other benchmark detectors is an appropriate detector for the dosimetry of small stereotactic radiosurgery photon fields.