双源CT 70与120 kV不同CARE Dose 4D预设值下图像质量的对比研究
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摘要
目的:探讨双源CT不同管电压和CARE Dose 4D预设值下的辐射剂量与图像质量相关性,为低剂量扫描方案奠定基础。方法:使用西门子FLASH双源CT对水模进行图像采集。根据管电压分为A、B 2组,A组:管电压70 kV,B组:管电压120 k V。每组CARE Dose 4D预设值均为150、200、250、300、350和400 m As,其他参数不变。采用SPSS 18.0软件对CT值、图像信噪比(signal noise ratio,SNR)、剂量长度乘积(dose length produce,DLP)、容积CT剂量指数(CT dose index volumes,CTDIvol)进行统计分析,以P<0.05为差异有统计学意义。结果:在A组中,不同预设值间CT值无统计学差异(F=0.832,P=0.537>0.05),CT值标准差具有统计学差异(F=6.115,P=0.001<0.05);在B组中,不同预设值间CT值无统计学差异(F=0.880,P=0.506>0.05),CT值标准差具有统计学差异(F=9.470,P=0.000<0.05)。在相同预设值150 mAs下,A组和B组间CT值和SNR值无统计学差异(P>0.05),B组的CTDIvol和DLP是A组的4.4倍。结论:在相同的管电压下,随着CARE Dose 4D预设值增加,辐射剂量增大,噪声降低,图像质量提高;在相同的CARE Dose4D预设值下,70 k V下降低了辐射剂量,但与120 k V下图像质量没有统计学差异。
Objective To explore the correlation between radiation dose and image quality under different tube voltages of dual-source CT and preset values of CARE Dose 4D to lay a foundation for low-dose scanning scheme. Methods The images were collected by Siemens FLASH dual-source CT, and then divided into Group A with tube voltage 70 kV and Group B with tube voltage 120 kV. Preset values of CARE Dose 4D in each group were 150, 200, 250, 300, 350 and 400 m As, respectively.Other parameters were kept unchanged. The obtained images were statistically analyzed by CT value, SNR, DLP, and CTDIvol,and P<0.05 was considered statistically significant. Results In Group A, there were no significant differences between the CT values with different preset values(F=0.832, P=0.537>0.05), while the standard deviations of CT values showed statistical differences(F=6.115, P=0.001<0.05). In Group B, there were no statistical differences in the CT values(F=0.880, P=0.506>0.05), while the standard deviations of CT values showed statistical differences(F=9.470, P=0.000<0.05). With the preset value kept as 150 mAs, there were no obvious differences between the CT values and SNR values of Group A and B, and the CTDIvol and DLP of Group B were 4.4 times as high as those of Group A. Conclusion Under the same tube voltage, radiation dose increases, noise decreases and image quality advances with the rising of CARE Dose 4D preset values; under the same CARE Dose 4D preset value, the radiation dose decreases with 70 kV tube voltage while the image quality with 70 kV tube voltage is not significantly different from that with 120 kV voltage.
Objective To explore the correlation between radiation dose and image quality under different tube voltages of dual-source CT and preset values of CARE Dose 4D to lay a foundation for low-dose scanning scheme. Methods The images were collected by Siemens FLASH dual-source CT, and then divided into Group A with tube voltage 70 kV and Group B with tube voltage 120 kV. Preset values of CARE Dose 4D in each group were 150, 200, 250, 300, 350 and 400 m As, respectively.Other parameters were kept unchanged. The obtained images were statistically analyzed by CT value, SNR, DLP, and CTDIvol,and P<0.05 was considered statistically significant. Results In Group A, there were no significant differences between the CT values with different preset values(F=0.832, P=0.537>0.05), while the standard deviations of CT values showed statistical differences(F=6.115, P=0.001<0.05). In Group B, there were no statistical differences in the CT values(F=0.880, P=0.506>0.05), while the standard deviations of CT values showed statistical differences(F=9.470, P=0.000<0.05). With the preset value kept as 150 mAs, there were no obvious differences between the CT values and SNR values of Group A and B, and the CTDIvol and DLP of Group B were 4.4 times as high as those of Group A. Conclusion Under the same tube voltage, radiation dose increases, noise decreases and image quality advances with the rising of CARE Dose 4D preset values; under the same CARE Dose 4D preset value, the radiation dose decreases with 70 kV tube voltage while the image quality with 70 kV tube voltage is not significantly different from that with 120 kV voltage.
引文
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[18]梁奕,杜柏林,汪汉林,等.低浓度对比剂联合低电压和迭代重建算法在320排CT冠状动脉成像中的应用[J].实用放射学杂志,2016,32(1):114-117.
[19]赵海波,崔惠勤,罗焕江,等.不同对比剂下CT值和辐射剂量相关性的实验研究[J].医疗卫生装备,2016,37(6):86-88.
[20]赵海波,罗焕江,龙腾河,等.螺旋CT不同参数与辐射剂量相关性的实验研究[J].医疗卫生装备,2014,35(11):89-91.
[2]杨威,陈燕浩,谢元亮,等.64层CT低剂量扫描在急性阑尾炎术前诊断价值与病理对照研究[J].实用放射学杂志,2011,27(9):1 370-1 373.
[3]江一峰,叶剑定,丁晓,等.64层螺旋CT低剂量扫描检测肺小结节敏感性的实验研究[J].实用放射学杂志,2010,26(1):115-119.
[4]王泽锋,刘挨师,赵磊,等.64排螺旋CT胸痛三联排查低剂量研究[J].实用放射学杂志,2011,27(3):437-440.
[5]张祺丰,彭芸,李剑颖,等.64排螺旋CT自动管电流调节技术降低儿童胸部扫描剂量的应用研究[J].中国医学影像技术,2009,25(9):1 591-1 594.
[6]华小兰,冯琦,殷焱,等.128排冠状动脉CTA图像质量与低剂量的研究分析[J].实用放射学杂志,2011,27(10):1 570-1 573.
[7]徐晓东,邵军明,孔军.西门子多排螺旋CT新技术[J].CT理论与应用研究,2006,15(2):24-25.
[8]李杨飞,樊树峰,王安武,等.成人肺部自动毫安与固定毫安CT检查的辐射剂量比较[J].中国辐射卫生,2011,20(3):349-350.
[9]李航,彭芸,曾津津,等.联合低电压和自动管电流调节技术降低婴幼儿胸部增强CT扫描剂量[J].中国医学影像技术,2014,30(5):676-679.
[10]陈邦文,杨爱春,何海青,等.螺旋CT自动管电流技术在胸部扫描中的应用价值[J].中国辐射卫生,2011,20(2):211-212.
[11]沈庆隆,蔡毅勇,肖慧君,等.64层螺旋CT自动毫安调节技术在腹部低剂量CT扫描中的应用[J].福建医药杂志,2012,34(1):109-111.
[12]黄洲,李杰生,符平仲,等.全腹CT自动毫安扫描技术临床应用探讨[J].现代预防医学,2011,38(1):196-197.
[13]马宇,周智鹏,邱维加,等.自适应迭代重建算法结合自动管电流调制技术在腹部CT低剂量应用[J].中国医学影像学杂志,2014,22(2):145-148.
[14]张力,徐延峰,郑婧,等.低剂量自适应迭代重建技术在低辐射剂量头颈部CT血管成像中的应用[J].中国现代医学杂志,2017,27(2):81-85.
[15]宋建,李仁民,李小虎,等.ASIR算法结合自动管电流调制技术在泌尿系CT平扫中的应用[J].安徽医学,2016,37(8):933-936.
[16]李昂,沈君姝,曹新志,等.原始数据迭代重建和70 kV CT扫描对图像质量和辐射剂量的影响[J].医疗卫生装备,2015,36(3):99-102.
[17]秦定文,杨亚芳,顾生荣,等.64排螺旋CT低管电压扫描对腹部血管成像病变显示及图像质量的影响[J].中国医学创新,2014,11(25):74-77.
[18]梁奕,杜柏林,汪汉林,等.低浓度对比剂联合低电压和迭代重建算法在320排CT冠状动脉成像中的应用[J].实用放射学杂志,2016,32(1):114-117.
[19]赵海波,崔惠勤,罗焕江,等.不同对比剂下CT值和辐射剂量相关性的实验研究[J].医疗卫生装备,2016,37(6):86-88.
[20]赵海波,罗焕江,龙腾河,等.螺旋CT不同参数与辐射剂量相关性的实验研究[J].医疗卫生装备,2014,35(11):89-91.