Assessment of ct simulators used in radiotherapy treatment planning in Serbia, Croatia and Bosnia and Herzegovina

IF 0.9 4区工程技术 Q3 NUCLEAR SCIENCE & TECHNOLOGY Nuclear Technology & Radiation Protection Pub Date : 2021-01-01 DOI:10.2298/ntrp201118009p

B. Petrovic, D. Faj, Mladen Markovic, A. Tot, M. Marjanović, Mladen Kasabašić, I. Gencel, Dragomir Paunovic, J. Stankovic, Jelena Krestić-Vesović, Ivana Mišković, Koca Cicarevic, Juraj Bibić, M. Budanec, I. Králik, S. Galic, Darijo Hrepić, Lejla Ibrisimovic, Jasna Davidović, G. Kolarević

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引用次数: 0

Abstract

The purpose of this work was to evaluate computed tomography (CT) simulators used in radiotherapy treatment planning in Serbia, Croatia and Bosnia and Herzegovina. A survey of quality assurance programmes of 24 CT simulators in 16 facilities was conducted. Dedicated CT-to-ED phantom was scanned at 120 kV and 140 kV, to obtain CT-to-ED (ED- Electron Density) conversion curves as well as CTDIvol. Thoracal phantoms were scanned in standard and extended field of view to evaluate dosimetric effect on treatment planning and delivery. Mean age of measured scanners was 5.5 years. The mean water HU value was -6.5 (all scanners, all voltages) and air HU value was -997. Extended field of view CT data differ from standard field of view and differences between conversion curves have significant dosimetric impact. The CTDI data showed large range of values between centers. Better QA of CT simulators in all countries is recommended. CT-to-ED curve could be used as default at one voltage and per manufacturer. Extended field of view imaging can be used, but treatment planning should be avoided in the regions out of standard field of view.

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评估在塞尔维亚、克罗地亚和波斯尼亚和黑塞哥维那放射治疗计划中使用的ct模拟器

这项工作的目的是评估在塞尔维亚，克罗地亚和波斯尼亚和黑塞哥维那放射治疗计划中使用的计算机断层扫描(CT)模拟器。对16个设施的24台CT模拟器的质量保证计划进行了调查。在120 kV和140 kV下扫描专用CT-to-ED模体，获得CT-to-ED (ED- Electron Density)转换曲线和CTDIvol。在标准视场和扩展视场扫描胸廓幻象，评估剂量学对治疗计划和给药的影响。所测扫描仪的平均年龄为5.5岁。水中平均HU值为-6.5(所有扫描仪，所有电压)，空气平均HU值为-997。扩展视场CT数据不同于标准视场，转换曲线之间的差异具有显著的剂量学影响。CTDI数据显示中心之间的数值范围较大。建议各国对CT模拟器进行更好的质量保证。ct - ed曲线可以作为一个电压和每个制造商的默认值。可采用扩展视场成像，但应避免在标准视场外的区域进行治疗计划。

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来源期刊

Nuclear Technology & Radiation Protection NUCLEAR SCIENCE & TECHNOLOGY-

CiteScore

2.00

自引率

41.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Nuclear Technology & Radiation Protection is an international scientific journal covering the wide range of disciplines involved in nuclear science and technology as well as in the field of radiation protection. The journal is open for scientific papers, short papers, review articles, and technical papers dealing with nuclear power, research reactors, accelerators, nuclear materials, waste management, radiation measurements, and environmental problems. However, basic reactor physics and design, particle and radiation transport theory, and development of numerical methods and codes will also be important aspects of the editorial policy.