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Study on the Influencing Factors and Long-term Stability of the CT Number of Siemens Large Aperture CT Simulator |
HU Jin-you1,2,ZOU Lian1,XIE Zhao1,LUO Ke-lin1,YIN Yun-peng1,ZHANG Wei-sha1 |
1. Cancer Center, Sichuan Academy of Medical Sciences Sichuan Provincial People‘s Hospital, Chengdu,Sichuan 610072, China
2. Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu, Sichuan 610064, China |
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Abstract The influence of scanning parameters on the CT number of CIRS-062M phantom was studied by changing the current time product, voltage and reconstruction convolution kernel of Siemens CT simulator.The annual quality assurance data of CIRS-062M phantom and the monthly quality assurance data of CTP504 phantom were retrospectively analyzed to study the long-term stability of CT number.The results show that the current time product has almost no effect on the CT number, and the maximum change is 4.6HU.The voltage has great influence on the CT number, with the maximum change of 585.3HU. Except for the Head H31s and Child Head H21s convolution kernels, the other convolution kernels have slight influence on the CT number.The CT number of the two phantoms have maintained good consistency in recent years, the maximum change is dense bone in CIRS-062M phantom, with a maximum change of 63.3HU and an average change of (-8.68±17.82)HU.
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Received: 13 May 2021
Published: 18 May 2023
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[7] |
郑庆增, 鞠忠建, 邵莹, 等.模拟定位CT的机型及扫描参数对CT值和噪声的影响 [J].中国医学物理学杂志, 2017, 34 (5): 439-444.
|
[1] |
祁振宇, 黄劭敏, 邓小武. 放疗计划CT值的校准检测及其影响因素分析 [J]. 癌症, 2006, 25 (1): 110-114.
|
[13] |
黄锦锋,陈晓朝,王宏.口腔锥形束CT关键参数检测方法的研究[J].计量学报, 2021, 42(3): 375-379.
|
|
Qi Z Y, Huang S M, Deng X W. Calibration of CT Values Used for Radiation Treatment Planning and It’s Impact Factors [J]. Chinese Journal of Cancer, 2006, 25 (1): 110-114.
|
[2] |
张国前, 张书旭, 余辉, 等. 放疗定位扫描条件对CT值的影响 [J].中国医疗设备, 2015, 30 (3): 13-16.
|
[3] |
廖雄飞, 黎杰, 王培.CT模拟定位机的扫描参数对放疗计划系统剂量计算的影响 [J].肿瘤预防与治疗, 2015, 28 (1): 49-51.
|
|
Feng G S, Liang Y, Wu D L, et al. Impact factor of relationships between CT value and relative electron density for treatment planning system [J]. Chin J Radiat Oncol, 2012, 21 (3): 281-284.
|
[6] |
Constantinou C, Harrington J C, Dewerd L A. An electron density calibration phantom for CT-based treatment planning computers [J]. Med Phys, 1992, 19 (2): 325-327.
|
[8] |
Afifi M B, Abdelrazek A, Deiab N A, et al. The effects of CT x-ray tube voltage and current variations on the relative electron density (RED) and CT number conversion curves [J]. Journal of Radiation Research and Applied Sciences, 2019, 13 (1): 1-11.
|
[9] |
张俊, 周丁屹, 谢丛华, 等.CT值区间划分及用于治疗计划剂量计算研究 [J].中华放射肿瘤学杂志, 2017, 26 (9): 1067-1071.
|
[12] |
时飞跃, 田书畅, 金洵,等.瓦里安OBI系统锥形束CT图像CT值长期稳定性分析 [J].计量学报, 2020, 41 (1): 102-108.
|
[16] |
朱凤盈, 马彦凝, 罗锦胜, 等.CT-电子密度转换曲线误差对IMRT剂量计算结果的影响 [J].中国医学物理学志, 2020, 37 (7): 816-821.
|
[17] |
Rasmussen B, Chu K, Tong S. Relative electron density phantom comparison [J]. Med Phys, 2012, 39 (6): 3827.
|
[10] |
Prevrhal L S, Engelke K, Kalender W A. Accuracy limits for the determination of cortical width and density: the influence of object size and CT imaging parameters [J]. Physics in Medicine and Biology, 1999, 44 (3): 751-764.
|
|
Huang J F, Chen X Z,Wang H.Research on the Detection Method of Key Parameters of Oral and Maxillofacial CBCT[J]. Acta Metrologica Sinica, 2021, 42(3): 375-379.
|
[15] |
Mahmoudi R, Jabbari N, Aghdasi M, et al. Energy dependence of measured CT numbers on substituted materials used for CT number calibration of radiotherapy treatment planning systems [J]. PLoS One, 2016, 11 (7): e0158828.
|
|
Zhang G Q, Zhang S X, Yu H, et al. Influence of Scanning Conditions on CT Values in Radiotherapy Simulation Positioning [J].China Medical Devices, 2015, 30 (3): 13-16.
|
[4] |
冯国生, 梁远, 吴丹玲, 等.CT值-相对电子密度转换曲线的影响因素分析 [J].中华放射肿瘤学杂志, 2012, 21 (3): 281-284.
|
[5] |
Mutic S, Palta J R, Butker E K, et al. Quality assurance for computed-tomography simulators and the computed-tomography-simulation process: report of the AAPM Radiation Therapy Committee Task Group No.66 [J]. Med Phys, 2003, 30 (10): 2762-2792.
|
|
Zheng Q Z, Ju Z J, Shao Y, et al.Impact of different CT simulators and scanning parameters on CT value and image noise [J]. Chinese Journal of Medical Physics, 2017, 34 (5): 439-444
|
|
Zhang J, Zhou D Y, Xie C H, et al. Influence of CT value division on dose calculation in treatment planning [J]. Chin J Radiat Oncol, 2017, 26 (9): 1067-1071.
|
[11] |
Vergalasova I, McKenna M, Yue N J, et al. Impact of computed tomography (CT) reconstruction kernels on radiotherapy dose calculation[J]. J Appl Clin Med Phys,2020, 21(9): 178-186.
|
|
Shi F Y, Tian S C, Jin X, et al.Long-term Constancy of CT Numbers for Cone-beam CT images of a varian OBI System[J]. Acta Metrologica Sinica, 2020, 41 (1): 102-108.
|
[14] |
Yagi M, Ueguchi T, Koizumi M, et al. Gemstone spectral imaging determination of CT to ED conversion curves for radiotherapy treatment planning [J]. J Appl Clin Med Phys, 2013, 14 (5): 173-186.
|
|
Zhu F Y, Ma Y N, Luo J S, et al.Effect of the error of CT-electron density conversion curve on IMRT dose calculation [J]. Chinese Journal of Medical Physics, 2020, 37 (7): 816-821.
|
[18] |
Witold S, Sylwia Z D, Marta W, et al. Computed Tomography as a Source of Electron Density Information for Radiation Treatment Planning [J]. Strahlentherapie und onkologie, 2010, 18 (6): 327-333.
|
|
|
|