[Properties and usage of radiophotoluminescent glass dosimeters for computed tomography dosimetry].
[Properties and usage of radiophotoluminescent glass dosimeters for computed tomography dosimetry].
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用于计算机断层扫描剂量测定的放射光致发光玻璃剂量计的性能和用途。
DOI：
10.6009/jjrt.2015_jsrt_71.1.12
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
K. Koshida
中科院分区：
文献类型：
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作者：
A. Hirosawa;K. Matsubara;H. Kondo;K. Koshida
有两种类型的辐射光致发光玻璃剂量计（RPLD）。一种胶囊（GD-352 M）中有锡过滤器，另一种没有过滤器（GD-302 M）。我们的研究的目的是评估这些RPLD的计算机断层扫描（CT）剂量测定的属性：能量依赖性，变化，角度依赖性和剂量分布在一个单一的切片。研究了RPLD测量的空气比释动能与电离室测量的空气比释动能的比值与能量的关系及其变化规律。角依赖性的RPLD和离子室进行了研究。分别以90°、60°、30°、0°、-30°、-60°、-90°照射RPLD：0°垂直于RPLD长轴方向，正、负分别表示顺时针和逆时针。使用46个RPLD采集了拟人化体模的单个切片中的剂量分布。GD-302 M和GD-352 M的剂量响应分别依赖于X射线的束流能量和照射角度。GD-352 M剂量计之间的剂量变化较大。从GD-352 M获得的剂量低于GD-302 M。GD-352 M的剂量分布是由原X射线形成的，因此CT剂量测定应使用不带锡滤光片的RPLD。
There are two types of radiophotoluminescent glass dosimeters (RPLDs). One has a tin filter in the capsule (GD-352M) and the other has no filter (GD-302M). The purpose of our study was to evaluate the properties of these RPLDs for computed tomography (CT) dosimetry: energy dependence, variation, angular dependence, and dose distribution in a single slice. Energy dependence and variation were investigated for ratio of the air kerma measured by RPLDs to that by ion chamber. Angular dependence was investigated for RPLDs and ion chamber. RPLDs were irradiated at 90°, 60°, 30°, 0°, -30°, -60°, and -90°: 0° was vertical to long axial direction of the RPLD, and plus and minus meant clockwise and anti-clockwise, respectively. Dose distribution in a single slice of an anthropomorphic phantom was acquired using 46 RPLDs. The dose responses of GD-302M and GD-352M depended on beam energy and irradiation angle of X-ray, respectively. The dose variation among dosimeters was large with GD-352M. The dose obtained from GD-352M was lower than that from GD-302M. It was expected that the dose distribution of GD-352M was formed by the primary X-ray, so RPLD without tin filter should be used for CT dosimetry.