Investigating The Effect on Backscatter Factor When Measuring Entrance Surface Dose Using the Raysafe X2 Solid State Radiography and Fluoroscopy Detector.

IF 1.8 4区 医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
Vadim Lordinot, Chris Koller
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引用次数: 0

Abstract

Objectives: Assessment of patient dose is a critical quality assurance check towards ensuring it is kept as low as reasonably practicable. One metric used to evaluate this is Entrance Surface Dose (ESD)- the summed magnitudes of the incident radiation and Compton scatter resulting from photon interactions within tissue. ESD can be directly measured using a dosemeter that is sensitive to backscattered radiation. However, the increasing use of solid-state detectors such as the tin backed RaySafe X2 R/F detector, means that ESD cannot be directly measured. The IAEA Technical Report No.457, recommends using backscatter factors (BSF) as calculated by Petoussi-Henss et al in1998 via Monte Carlo methods when measuring ESD using such dosemeters. This research seeks to practically determine a reliable method of calculating the BSF using a PMMA patient-equivalent phantom.

Methods: A comparison between the solid-state detector and an ionisation chamber capable of detecting backscatter was conducted. Special attention was given to BSF variation with both radiation field size and beam quality by varying additional copper and aluminium filtration to mimic the behaviour of patient-dose reducing techniques on modern fluoroscopy systems.

Results: Results have shown significant correspondence with those of Petoussi-Henss et al using the simulated water and ICRU tissue equivalent phantoms.

Conclusions: Given the results consistency, BSFs from this study have been proposed for use when measuring ESD using the RaySafe solid state detector with a PMMA patient-equivalent phantom for quality assurance purposes.

Advances in knowledge: This research provides the opportunity to obtain more accurate patient dose data during quality assurance testing with modern solid-state dosemeters.

利用Raysafe X2固体x线摄影和荧光探测器测量入口表面剂量对后向散射系数的影响
目的:患者剂量评估是一项关键的质量保证检查,以确保其保持在合理可行的低水平。用于评估这一点的一个度量是入口表面剂量(ESD)——由组织内光子相互作用产生的入射辐射和康普顿散射的总和。ESD可以使用对后向散射辐射敏感的剂量计直接测量。然而,越来越多的使用固态探测器,如锡衬底的RaySafe X2 R/F探测器,意味着ESD不能直接测量。国际原子能机构第457号技术报告建议在使用此类剂量计测量ESD时,使用Petoussi-Henss等人在1998年通过蒙特卡罗方法计算的后向散射因子(BSF)。本研究旨在实际确定一种可靠的方法来计算BSF使用PMMA病人等效的幻影。方法:对固体探测器和电离室进行了对比。特别关注BSF随辐射场大小和光束质量的变化,通过改变额外的铜和铝过滤来模拟现代透视系统中患者剂量降低技术的行为。结果:结果显示与Petoussi-Henss等人使用模拟水和ICRU组织等效模型的结果有显著的对应关系。结论:考虑到结果的一致性,本研究的bsf已被建议用于使用RaySafe固态探测器和PMMA患者等效模体测量ESD时,以保证质量。知识的进步:这项研究提供了在质量保证测试中获得更准确的患者剂量数据的机会,使用现代固态剂量计。
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来源期刊
British Journal of Radiology
British Journal of Radiology 医学-核医学
CiteScore
5.30
自引率
3.80%
发文量
330
审稿时长
2-4 weeks
期刊介绍: BJR is the international research journal of the British Institute of Radiology and is the oldest scientific journal in the field of radiology and related sciences. Dating back to 1896, BJR’s history is radiology’s history, and the journal has featured some landmark papers such as the first description of Computed Tomography "Computerized transverse axial tomography" by Godfrey Hounsfield in 1973. A valuable historical resource, the complete BJR archive has been digitized from 1896. Quick Facts: - 2015 Impact Factor – 1.840 - Receipt to first decision – average of 6 weeks - Acceptance to online publication – average of 3 weeks - ISSN: 0007-1285 - eISSN: 1748-880X Open Access option
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