毫安秒对SPECT/CT检查中辐射剂量和影像质量影响的研究
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摘要
目的在保证影像质量的前提下,为降低SPECT/CT检查中CT部分受检者的辐射剂量提供参考依据。方法使用西门子公司SymbiaT2型SPECT/CT,固定管电压130 kV,螺距2.0,分别在100 mAs、130 mAs、160 mAs、190 mAs和230 mAs的条件下测量容积CT剂量指数(CTDI_(vol)),扫描Catphan 600型和Catphan 500型CT性能检测模体,分析扫描图像,得到各个条件下CT影像质量指标。结果 CTDI_(vol)随管电流时间积(mAs)的升高而线性升高,mAs的改变对高对比分辨力,CT值和CT值的线性指标无影响,低对比可探测能力、均匀性和噪声值指标随mAs的升高而降低。结论 SPECT/CT中的CT辐射剂量随mAs的升高而升高,影像质量随着mAs的升高而提高,由于mAs对高对比分辨力无影响,在进行特定部位的扫描时可选择适当降低mAs,实现在保证影像质量的前提下降低受检者的辐射剂量。
Objective To provide a reference basi for reducing radiationdose of some CT in SPECT/CT examinations while ensuring quality of image.Methods By using SymbiaT2 of Siemens SPECT/CT,fixed tube voltage 130 kV and pitch 2.0, the volume CT dose index(CTDI_(vol))was measuredwhile Model of Catphan 600 was scanned under the condition of 100 mAs、130 mAs、160 mAs、190 mAs and 230 mAs, respectively. The quality indexes of CT images under various conditions are obtained by analyzing the scanned images.Results CTDI_(vol) increased linearly with the milliampere second. the change of mA second has no effect on the high contrast resolution, the CT value and the linear index of the CT value, and the low contrast detectability, the uniformity and the noise value index decrease with the increase of milliampere-second. Conclusion The image quality of SPECT/CT image and radiation dose of CT in SPECT/CT increases with the increase of milliampere-second. While milliampere-second has no effect on the high contrast resolution, the radiation dose couldbe decreased appropriately under the guarantee of the quality of the image in specific conditions.
Objective To provide a reference basi for reducing radiationdose of some CT in SPECT/CT examinations while ensuring quality of image.Methods By using SymbiaT2 of Siemens SPECT/CT,fixed tube voltage 130 kV and pitch 2.0, the volume CT dose index(CTDI_(vol))was measuredwhile Model of Catphan 600 was scanned under the condition of 100 mAs、130 mAs、160 mAs、190 mAs and 230 mAs, respectively. The quality indexes of CT images under various conditions are obtained by analyzing the scanned images.Results CTDI_(vol) increased linearly with the milliampere second. the change of mA second has no effect on the high contrast resolution, the CT value and the linear index of the CT value, and the low contrast detectability, the uniformity and the noise value index decrease with the increase of milliampere-second. Conclusion The image quality of SPECT/CT image and radiation dose of CT in SPECT/CT increases with the increase of milliampere-second. While milliampere-second has no effect on the high contrast resolution, the radiation dose couldbe decreased appropriately under the guarantee of the quality of the image in specific conditions.
引文
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[14] 吴一田,耿建华.PET-CT、SPECT及SPECT-CT受检者辐射水平及其生物效应研究进展[J].中国医学装备,2017,14(3):141-146.
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[2] 郑海亮,李兴东,刘小丽,等.CT-SD16探测器辐射剂量测量原理和参数设定[J].北京生物医学工程,2012,31(3):278-282.
[3] 中华人民共和国卫生部.GB 17589-2011 X射线计算机断层摄影装置质量保证规范[S].2011.
[4] 杨国仁.关于SPECT/CT的优势及选型相关问题初探[J].中国医疗器械信息,2013(10):9-14.
[5] 张庆召,刘梅,梁婧,等.SPECT检查过程中放射性核素99mTc的剂量评价[J].中国医学装备,2015,12(5):65-67.
[6] 刘雪辉,李洪均,于鸿煦,等.SPECT/CT显像致患者有效剂量的初步探讨[J].中华核医学与医学影像杂志,2015,35(5):387-390.
[7] BrixG,NekollaEA,BorowskiM,et al.Radiationriskand protection ofpatients in clinical SPECT/CT[J].EurJNuclMed Mol Imaging,20141(Suppl 1):125-136.
[8] 王风,赵伟,赵启超,等.核医学检查受检者所受辐射剂量分析[J].中华放射医学与防护杂志,2015,35(9):705-708.
[9] LarsonDB,WangLL,PodbereskyDJ,etal.System for Verifiable CT radiation Dose Optimization Based onimage Quality.Part Ⅰ.OptimizationModel[J].Radiology,2013,269(1):167-176.
[10] 岳保荣,牛延涛.国际放射防护委员会(ICRP)第102号出版物多排探测器计算机X线体层摄影患者剂量控制[M].北京:人民军医出版社,2011.
[11] 杜广芬,李海亮,韩中山,等.多层螺旋CT低剂量扫描的临床应用现状[J].中国辐射卫生,2012,21(2):246-247.
[12] Palmedo H,Marx C,Ebert A,et al.Whole-body SPECT/CT for bone scintigraphy:diagnostic value and effect on patient management in oncological patients[J].Eur J Nucl Med Mol Imaging,2012,41(1):59-67.
[13] 王道庆,刘玉丽.多层螺旋CT检查辐射危害控制探讨[J].中国辐射卫生,2016,25(5):569-572.
[14] 吴一田,耿建华.PET-CT、SPECT及SPECT-CT受检者辐射水平及其生物效应研究进展[J].中国医学装备,2017,14(3):141-146.
[15] 黄开发,凌瑞杰,孙敬智,等.CT质量控制检测程序的解读[J].中国辐射卫生,2015,24(3):266-267.