|Table of Contents|

The influence of scanning condition of CT simulated positioner on image quality

Journal Of Modern Oncology[ISSN:1672-4992/CN:61-1415/R]

Issue:
2022 04
Page:
693-697
Research Field:
Publishing date:

Info

Title:
The influence of scanning condition of CT simulated positioner on image quality
Author(s):
ZHANG Kun1; HAN Jingjing1; LI Fang2; WANG Xuemin1; DENG Jia1; YANG Di1; WU Xiangyang1
1.Department of Radiation Oncology，Shaanxi Province Cancer Hospital，Shaanxi Xi'an 710061,China;2.The Second Affiliated Hospital of Xi'an Jiaotong University,Shaanxi Xi'an 710004,China.
Keywords:
radiotherapy; CT simulation; scanning protocol; image quality
PACS:
R730.55
DOI:
10.3969/j.issn.1672-4992.2022.04.027
Abstract:
Objective:To analyze the influence of different scanning conditions of large-size CT simulation positioning machine on images quality,and provide reference for the selection of scanning protocol in simulation positioning work.Methods:The Catphan504 phantom was scanned with a Philips large-aperture CT simulation positioning machine,and the influence of scanning conditions such as tube voltage,tube current,layer thickness,filter,scanning method,scanning field of view,and placement position on the CT image was analyzed.Results:The CT grayscale value was obviously affected by the tube voltage and the filter.The deviation of CT grayscale value is 69.6 HU for the 140 kV tube voltage.The maximum deviation of CT grayscale value was 215.3 HU for the Sharp Edge filter.The image uniformity was obviously affected by the filters Detail,Y-Sharp,and Y-Detail.The spatial resolution parameters were significantly affected by the matrix,filter,and placement parameters.The contrast resolution parameter was obviously affected by the tube current and the filter.Conclusion:The influence of tube voltage,tube current,filter,matrix,and placement position on CT images cannot be ignored.In clinical work,appropriate scanning conditions should be selected according to clinical requirements to improve the image quality while ensuring the accuracy of CT values.

References:

[1] 李定杰，刘如，毛荣虎，等.不同CT扫描条件模拟定位对放射治疗计划的影响［J］.中华肿瘤防治杂志，2012,19(20):1579-1581. LI DJ,LIU R,MAO RH,et al.Evaluation of scanning parameters in CT simulation on radiotherapy planning ［J］.Chinese Journal of Cancer Prevention and Treatment,2012,19(20):1579-1581.
[2] 陈利，邓小武，黄劭敏，等.三维治疗计划系统和CT模拟定位工作站影像重建质量检测［J］.中国肿瘤，2008,17(8):668-671. CHEN L,DENG XW,HUANG SM,et al.Reconstructed imaging quality of three dimensional treatment planning systems and CT simulation workshop［J］.Bulletin of China Cancer,2008,17(8):668-671.
[3] 巩汉顺，徐伟，徐寿平，等.不同扫描条件下CBCT影像质量及其HU值长期稳定性分析［J］.中国医疗器械杂志，2016,40(2):86-89. GONG HS,XU W,XU SP,et al.Evaluation of cone beam CT image quality and analysis of its long-term stability on HU values under different conditions ［J］.Chinese Journal of Medical lnstrumentation,2016,40(2):86-89.
[4] DE OLIVEIRA MV,WENZEL A,CAMPOS PS,et al.Quality assurance phantoms for cone beam computed tomography:a systematic literature review ［J］.Dentomaxillofacial Radiology,2017,46(3):20160329.
[5] MUTIC S,PALTA JR,BUTKER EK,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］.Medical Physics,2003,30(10):2762-2792.
[6] International Atomic Energy Agency.Quality assurance programme for computed tomography:Diagnostic and therapy applications ［M］.Vienna:IAEA,2012:1-171.
[7] 中华人民共和国国家卫生健康委员会.WS519-2019 X射线计算机体层摄影装置质量控制检测规范［S］.北京：中国标准出版社，2019:1-8. National Health Commission of the People's Republic of China.WS519-2019 specification for testing of quality control in X-ray computed tomography［S］.Beijing:China Standards Press,2019：1-8.
[8] 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. ZHENG QZ,JU ZJ,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.
[9] SOLOMON J,LYU P,MARIN D,et al.Noise and spatial resolution properties of a commercially available deep earning based CT reconstruction algorithm ［J］.Medical Physics,2020,47(9):3961-3971.
[10] ANAM C,FUJIBUCHI T,HARYANTO F,et al.An evaluation of computed tomography dose index measurements using a pencil ionisation chamber and small detectors ［J］.Journal of Radiological Protection,2019,39(1):112-124.
[11] 张白霖，戴振晖，朱琳，等.不同设备不同扫描参数对影像组学特征可再现性影响分析［J］.中国医学物理学杂志，2021,38(1):61-64. ZHANG BL,DAI ZH,ZHU L,et al.An analysis of influence of different equipment and different scanning parameters on reproducibility of radiomics features ［J］.Chinese Journal of Medical Physics,2021,38(1):61-64.
[12] 张坤，李芳，陈力，等.大孔径CT模拟定位机扫描条件对CT值影响分析［J］.现代肿瘤医学，2021,29(9):1575-1579. ZHANG K,LI F,CHEN L,et al.Analysis of the effect of scanning conditions of Brilliance CT Big Bore on CT value ［J］.Modern Oncology,2021,29(9):1575-1579.
[13] 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. FENG GS,LIANG Y,WU DL,et al.Impact factor of relationships between CT value and relative electron density for treatment planning system ［J］.Chinese Journal of Radiation Oncology,2012,21(3):281-284.
[14] TOMIC N,PAPACONSTADOPOULOS P,ALDELAIJAN S,et al.Image quality for radiotherapy CT simulators with different scanner bore size ［J］.Physica Medica,2018,45：65-71.
[15] 李金霞，王文生，任华，等.iDose4双模型迭代重建算法对CT图像质量及扫描剂量影响的模体研究［J］.中国临床医学影像杂志，2014,25(3):190-194. LI JX,WANG WS,REN H,et al.Investigation impact of dual model iterative reconstruction method(iDose4) on the CT image quality and dose reduction-a phantom approach ［J］.Journal of China Clinic Medical Imaging,2014,25(3):190-194.
[16] 殷旭君，王新，李夏南，等.低剂量迭代重建技术在放疗定位图像中的应用［J］.中国医学物理学杂志，2020,37(02):145-152. YIN XJ,WANG X,LI XN,et al.Application of low-dose iterative reconstruction technique for radiotherapy localization images ［J］.Chinese Journal of Medical Physics,2020,37(02):145-152.

Memo

Memo:
陕西省卫建委项目(编号：2018A007)
Last Update: 1900-01-01