An evaluation of semiconductor and ionization chamber detectors for diagnostic x-ray dosimetry measurements
An evaluation of semiconductor and ionization chamber detectors for diagnostic x-ray dosimetry measurements
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DOI：
10.1088/0031-9155/52/15/007
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发表时间：
2007-08-07
影响因子：
3.5
通讯作者：
Martin, C. J.
中科院分区：
文献类型：
--
作者：
Martin, C. J.
用于X射线设备性能测试的剂量计可使用半导体技术或电离室(IC)。半导体剂量计将几种元件结合到探测器中，从探测器中可以获得对响应光子能量的变化的补偿。探测器的设计随角度影响其响应，这与集成电路的设计不同。测量了半导体探测器和集成电路对具有不同辐射质量的X射线束的响应，以评估响应的差异。通过模拟探测器在数字射线照相和透视设备的性能测试中的使用的实验安排进行了测量。结果表明，两种探测器之间的光子能量响应差异很小，但由于IC对从各个角度入射的辐射都很敏感，所以它们记录的散射辐射比SDS更多。讨论了探测器响应差异的影响，并就它们的使用提出了建议。十二烷基硫酸钠更适合于图像受体剂量的测量，并推荐用于设置数字射线照相的自动曝光控制装置。ICS适用于患者入射表面剂量率测量的评估。提出了可用于比较不同剂量计测量结果的修正系数。
Dosemeters for performance testing of x-ray equipment may utilize semiconductor technology or ionization chambers ( ICs). Semiconductor dosemeters incorporate several elements into the detectors from which compensation for variations in response with photon energy is derived. The design of the detectors influences their response with angle and this is different from that of ICs. The responses of semiconductor detectors ( SDs) and ICs to x-ray beams with a variety of radiation qualities have been measured in order to assess differences in response. Measurements have been made with experimental arrangements simulating use of the detectors in performance testing of digital radiography and fluoroscopy equipment. Results show that differences in photon energy responses between the detectors are small, but because ICs are sensitive to radiation incident from all angles, they record more scattered radiation than SDs. Implications of differences in detector responses are discussed and recommendations made about their use. SDs are more appropriate for measurements of image receptor doses and are recommended for setting up automatic exposure control devices for digital radiography. ICs are suitable for assessment of patient entrance surface dose rate measurements. Correction factors that could be applied to allow comparisons between measurements with different dosemeters are proposed.