Dosimetry in clinical static magnetic fields using plastic scintillation detectors
Dosimetry in clinical static magnetic fields using plastic scintillation detectors
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DOI：
10.1016/j.radmeas.2013.03.012
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发表时间：
2013-09-01
影响因子：
2
通讯作者：
Greilich, S.
中科院分区：
文献类型：
--
作者：
Stefanowicz, S.;Latzel, H.;Greilich, S.
为了进一步提高向患者提供剂量的准确性，几个项目正在寻求将直线加速器与磁共振成像系统相结合。一般说来，这被认为是下一代图像引导放射治疗。然而，由于技术和物理原因，目前尚不清楚剂量测量将如何作为标准方法进行，并且可能不容易转移到具有临床磁场的系统中。对于MRI加速器中的剂量测量，我们测试了与光纤耦合的塑料闪烁探测器(PSD)。它们适用于放射治疗和诊断中的实时和体内剂量测定，并可能成为这一应用的全光学候选。为了研究在磁场中使用有机闪烁体的PSD的基本可行性，我们测量了这些剂量计在高达1T的磁场中的响应，结果发现，一些偏差高达假设信号的7%。虽然闪烁体的材料密度要高得多，但我们测量的信号行为与(Meijsing等人，2009)中针对Farmer电离室的行为相同，或与(RaaijMaker等人，2007)中所描述的薄膜的行为相同，这表明了辐射场效应，而不是检测到的响应本身的变化。(C)2013爱思唯尔有限公司。保留所有权利。
To further improve the accuracy of dose delivery to the patient, several projects are pursuing the integration of linear accelerators with magnetic resonance imaging systems. Generally, this is conceived as the next generation of image-guided radiotherapy. For technical and physical reason it is, however, not clear yet how dosimetry will be conducted as standard methods and might not be easily transferred to systems with clinical magnetic fields.For dosimetry in MRI accelerators, we have tested plastic scintillation detectors (PSD) coupled to optical fibers. They are suitable for real-time and in-vivo dosimetry in radiation treatments and diagnostics and could be, being all-optical, promising candidates for this application. To study the basic feasibility of using PSDs with organic scintillators in magnetic fields, we measured the response of these dosimeters in presence of magnetic fields up to 1 T. In conclusion, we found some deviations up to 7% of the supposed signal. Although the scintillators are of much denser material, we measured the same behavior in signal as in (Meijsing et al., 2009) for a Farmer ionization chamber or as in (Raaijmakers et al., 2007) for films described which indicates radiation field effect rather than changes in the detected response itself. (C) 2013 Elsevier Ltd. All rights reserved.