西门子CT模拟机图像均匀性的长期稳定性分析
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摘要
目的:分析使用水模体进行日常质量检测的数据,评价西门子Sensation Open CT模拟机图像均匀性的长期稳定性。方法:使用水模体,调用日常质量检测程序Daily Quality Check,每月检测西门子Sensation Open CT模拟机,得到标称管电压120 k V和140 kV两种情形的CT图像,通过手动勾画和计算得到图像均匀性的数据。对2017年3月～2018年2月的CT图像均匀性数据进行统计学分析和比较研究。结果:在120 kV情形下,第1至第6层(层厚4.8 mm)图像均匀性值分别为:(2.5±0.4)、(2.8±0.6)、(2.2±0.2)、(1.5±0.7)、(1.4±0.4)和(1.0±0.3)HU;在140 kV情形下,第1至第6层图像均匀性值分别为:(2.0±0.2)、(3.0±0.4)、(1.5±0.5)、(0.7±0.4)、(0.5±0.2)和(0.7±0.5)HU。该CT模拟机的图像均匀性在这12个月内的变化很小,所有值均在0～4 HU内。结论:在12个月内,该西门子CT模拟机图像均匀性比较稳定,满足使用要求。层面位置是影响图像均匀性的因素之一。
Objective To analyze the data from routine quality assurance(QA) measurement using water phantom and assess the long-term stability of image uniformity for a SIEMENS Sensation Open CT simulator. Methods The SIEMENS Sensation Open CT simulator was tested monthly using a water phantom and Daily Quality Check program. The CT images under the nominal tube voltages of 120 and 140 kV were obtained. Then the values of image uniformity were obtained by manual delineation and calculation. Finally, statistical analysis and comparative study were conducted on the test data obtained between March 2017 and February 2018. Results Under the nominal tube voltage of 120 kV, the values of image uniformity for the first to sixth slices,with a slice thickness of 4.8 mm, were(2.5±0.4),(2.8±0.6),(2.2±0.2),(1.5±0.7),(1.4±0.4) and(1.0±0.3) HU, respectively; and under the nominal tube voltage of 140 kV, the corresponding values were(2.0±0.2),(3.0±0.4),(1.5±0.5),(0.7±0.4),(0.5±0.2) and(0.7±0.5) HU, respectively. In the 12 months, all the values of image uniformity were within 4 HU and only had little changes. Conclusion In a time period of 12 months, the image uniformity for SIEMENS CT simulator is relatively stable and meets the requirements for application. The slice position is one of the factors affecting the image uniformity.
Objective To analyze the data from routine quality assurance(QA) measurement using water phantom and assess the long-term stability of image uniformity for a SIEMENS Sensation Open CT simulator. Methods The SIEMENS Sensation Open CT simulator was tested monthly using a water phantom and Daily Quality Check program. The CT images under the nominal tube voltages of 120 and 140 kV were obtained. Then the values of image uniformity were obtained by manual delineation and calculation. Finally, statistical analysis and comparative study were conducted on the test data obtained between March 2017 and February 2018. Results Under the nominal tube voltage of 120 kV, the values of image uniformity for the first to sixth slices,with a slice thickness of 4.8 mm, were(2.5±0.4),(2.8±0.6),(2.2±0.2),(1.5±0.7),(1.4±0.4) and(1.0±0.3) HU, respectively; and under the nominal tube voltage of 140 kV, the corresponding values were(2.0±0.2),(3.0±0.4),(1.5±0.5),(0.7±0.4),(0.5±0.2) and(0.7±0.5) HU, respectively. In the 12 months, all the values of image uniformity were within 4 HU and only had little changes. Conclusion In a time period of 12 months, the image uniformity for SIEMENS CT simulator is relatively stable and meets the requirements for application. The slice position is one of the factors affecting the image uniformity.
引文
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[13]彭文献,彭天舟,叶小琴,等.CT扫描参数对人体组织CT值影响的研究[J].中华放射医学与防护杂志,2010,30(1):79-81.PENG W X,PENG T Z,YE X Q,et al.Effect of CT scanning parameters on CT number[J].Chinese Journal of Radiological Medicine and Protection,2010,30(1):79-81.
[14]张富利,陈建平,郑明民.PHILIPS大孔径CT模拟机噪声测试研究[J].中国医疗设备,2009,24(1):123-124.ZHANG F L,CHEN J P,ZHENG M M.Measurement of image noise for Philips large bore CT-simulator[J].China Medical Devices,2009,24(1):123-124.
[15]时飞跃,任军,吴正参,等.西门子Sensation Open CT模拟机CT值稳定性分析[J].中华放射肿瘤学杂志,2017,26(12):1407-1410.SHI F Y,REN J,WU Z C,et al.Study on constancy of CT numbers of SIEMENS Sensation Open CT-simulator[J].Chinese Journal of Radiation Oncology,2017,26(12):1407-1410.
[16]BEEKSMA B,TRUANT D,HOLLOWAY L,et al.An assessment of image distortion and CT number accuracy within a wide-bore CTextended field of view[J].Australas Phys Eng Sci,2015,38(2):255-261.
[17]卜羽,高关心.CT图像均匀性数据的质量管理[J].中国医疗设备,2017,32(2):47-50.BU Y,GAO G X.Quality control in uniformity of CT image data[J].China Medical Devices,2017,32(2):47-50.
[18]杨克柽.CT值均匀性评价方法研究[J].中国测试,2016,42(1):7-11.YANG K C.A modified evaluation method for CT value uniformity[J].China Measurement&Test,2016,42(1):7-11.
[19]HOBSON M A,SOISSON E T,DAVIS S D,et al.Using the ACR CTaccreditation phantom for routine image quality assurance on both CTand CBCT imaging systems in a radiotherapy environment[J].J App Clin Med Phys,2014,15(4):226-239.
[20]OLIVER J A,ZEIDAN O A,MEEKS S L,et al.The Mobius AIROmobile CT for image-guided proton therapy:characterization&commissioning[J].J Appl Clin Med Phys,2017,18(3):130-136.
[21]TOMIC N,PAPACONSTADOPOULOS P,ALDELAIJAN S,et al.Image quality for radiotherapy CT simulators with different scanner bore size[J].Phys Med,2018,45:65-71.
[2]ABOU E S.Quality assurance for computed-tomography simulator:in home Z-phantom for mechanical tests of the couch and the gantry[J].Chinese-German J Clin Oncol,2013,12(5):237-242.
[3]WU V,PODGORSAK M B,TRAN T A,et al.Dosimetric impact of image artifact from a wide-bore CT scanner in radiotherapy treatment planning[J].Med Phys,2011,38(7):4451-4463.
[4]MUTIC S,PALTA J R,BUTKER E K,et al.Quality assurance for computed-tomography simulators and the computed-tomographysimulation process:report of the AAPM Radiation Therapy Committee Task Group No.66[J].Med Phys,2003,30(10):2762-2792.
[5]邓小武,黄邵敏,祁振宇.CT模拟机的质量控制和质量保证检验[J].中国肿瘤,2004,13(9):546-550.DENG X W,HUANG S M,QI Z Y.Quality control and quality assuring requirements of CT-simulator[J].China Cancer,2004,13(9):546-550.
[6]祁振宇,黄邵敏,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.QI Z Y,HUANG S M,DENG X W.Calibration of CT values used for radiation treatment planning and its impact factors[J].Chinese Journal Cancer,2006,25(1):110-114.
[7]时飞跃,柏正璐,秦伟.西门子CT模拟机水的CT值、图像噪声和管电压的长期稳定性分析[J].中国医学物理学杂志,2017,34(12):1232-1235.SHI F Y,BAI Z L,QIN W.Long-term stability of CT number of water,image noise and tube voltage for a SIEMENS CT-simulator[J].Chinese Journal of Medical Physics,2017,34(12):1232-1235.
[8]时飞跃,秦伟,陈飞,等.碳纤维平板对水的CT值影响的研究[J].中国医疗设备,2013,28(3):69-70.SHI F Y,QIN W,CHEN F,et al.Study on influence of carbon fibre plates on CT values of water[J].Chinese Medical Devices,2013,28(3):69-70.
[9]柏正璐,时飞跃,蒋红兵.使用Dose Lab检测CT图像均匀性的程序改进[J].中国数字医学,2017,12(12):57-60.BAI Z L,SHI F Y,JIANG H B.Program improvement in Dose Lab for testing CT image uniformity[J].Chinese Digital Medicine,2017,12(12):57-60.
[10]马桥,刘德明.四川省CT机质量控制与辐射防护检测结果分析[J].职业卫生与病伤,2015,30(3):161-163.MA Q,LIU D M.Detection and analysis on CT machine quality control and radiation protection in Sichuan province[J].Journal of Occupational Health and Damage,2015,30(3):161-163.
[11]甘晓根,徐子海,廖福锡,等.西门子SOMATOM OPEN CT简介及在放射治疗中的优势[J].中国医疗设备,2011,26(3):100-101.GAN X G,XU Z H,LIAO F X,et al.Introduction of Siemens SOMATOM OPEN CT system and its advantages in radiation therapy[J].China Medical Devices,2011,26(3):100-101.
[12]李锋坦,李东,张云亭.管电压对CT值测量、辐射剂量及图像质量影响的模型研究[J].中华放射学杂志,2013,47(5):458-461.LI F T,LI D,ZHANG Y T.Influence of tube voltage on CTattenuation,radiation dose,and image quality:phantom study[J].Chinese Journal of Radiology,2013,47(5):458-461.
[13]彭文献,彭天舟,叶小琴,等.CT扫描参数对人体组织CT值影响的研究[J].中华放射医学与防护杂志,2010,30(1):79-81.PENG W X,PENG T Z,YE X Q,et al.Effect of CT scanning parameters on CT number[J].Chinese Journal of Radiological Medicine and Protection,2010,30(1):79-81.
[14]张富利,陈建平,郑明民.PHILIPS大孔径CT模拟机噪声测试研究[J].中国医疗设备,2009,24(1):123-124.ZHANG F L,CHEN J P,ZHENG M M.Measurement of image noise for Philips large bore CT-simulator[J].China Medical Devices,2009,24(1):123-124.
[15]时飞跃,任军,吴正参,等.西门子Sensation Open CT模拟机CT值稳定性分析[J].中华放射肿瘤学杂志,2017,26(12):1407-1410.SHI F Y,REN J,WU Z C,et al.Study on constancy of CT numbers of SIEMENS Sensation Open CT-simulator[J].Chinese Journal of Radiation Oncology,2017,26(12):1407-1410.
[16]BEEKSMA B,TRUANT D,HOLLOWAY L,et al.An assessment of image distortion and CT number accuracy within a wide-bore CTextended field of view[J].Australas Phys Eng Sci,2015,38(2):255-261.
[17]卜羽,高关心.CT图像均匀性数据的质量管理[J].中国医疗设备,2017,32(2):47-50.BU Y,GAO G X.Quality control in uniformity of CT image data[J].China Medical Devices,2017,32(2):47-50.
[18]杨克柽.CT值均匀性评价方法研究[J].中国测试,2016,42(1):7-11.YANG K C.A modified evaluation method for CT value uniformity[J].China Measurement&Test,2016,42(1):7-11.
[19]HOBSON M A,SOISSON E T,DAVIS S D,et al.Using the ACR CTaccreditation phantom for routine image quality assurance on both CTand CBCT imaging systems in a radiotherapy environment[J].J App Clin Med Phys,2014,15(4):226-239.
[20]OLIVER J A,ZEIDAN O A,MEEKS S L,et al.The Mobius AIROmobile CT for image-guided proton therapy:characterization&commissioning[J].J Appl Clin Med Phys,2017,18(3):130-136.
[21]TOMIC N,PAPACONSTADOPOULOS P,ALDELAIJAN S,et al.Image quality for radiotherapy CT simulators with different scanner bore size[J].Phys Med,2018,45:65-71.