摘要
目的:探讨70kV结合正弦图迭代重建(SAFIRE)技术在腹部CTA扫描中的应用价值。方法:110例患者(低kV组)采用70kV、SAFIRE技术、欧乃派克(300mg I/mL)的CTA扫描方案,87例患者(对照组)采用120kV、滤波反投影(FBP)技术、欧乃派克(350mg I/mL)的扫描方案。对比两组的CT剂量指数(CTDIvol)、CT值、SD、对比噪声比(CNR)、图像灵敏度(FOM)、图像质量主观评分。结果:低kV组和对照组的CTDIvol分别为(3.08±0.15)mGy、(6.08±0.57)mGy,两组差异有统计学意义(P<0.05);低kV组腹主动脉、肾动脉、肠系膜上动脉的CT值分别为(431.45±27.42)HU、(415.44±16.51)HU、(311.85±17.75)HU,对照组分别为(334.91±14.41)HU、(335.51±13.76)HU、(312.63±18.59)HU;低kV组腹主动脉、肾动脉、肠系膜上动脉的SD分别为(15.96±1.75)、(18.63±3.01)、(26.99±2.65),对照组分别为(23.21±2.91)、(25.34±2.67)、(29.8±3.04),两组差异均具有统计学意义(P<0.05);低kV组腹主动脉、肾动脉、肠系膜上动脉的CNR分别为(26.58±2.93)、(25.77±2.52)、(20.31±1.74),对照组分别为(20.79±1.87)、(20.82±1.92)、(19.98±1.63);低kV组腹主动脉、肾动脉、肠系膜上动脉的FOM分别为(233.32±55.35)、(218.46±45.44)、(135.51±24.74),对照组分别为(72.34±15.45)、(72.57±15.62)、(66.71±12.86),两组差异均具有统计学意义(P<0.05);低kV组的图像质量评分为(4.56±0.65),对照组为(4.55±0.73),两组差异无统计学意义(P>0.05)。结论:70kV结合SAFIRE技术在腹部CTA扫描中,不仅可以大幅度降低辐射剂量,而且改善了腹部CTA的图像质量,减少了碘对比剂的相对含量,具有较高的临床应用价值。
Objective：To investigate the application value of 70kV in combination with Sinogram affirmed iterative reconstruction-（SAFIRE） technique in abdominal CT angiography （CTA）. Methods：Totally 110 patients （low kv group） had abdominal CTA using 70kV,SAFIRE technique with Omnipaque （300mg I/mL） as contrast medium,and 87 patients as the control group had abdominal CTA using 120kV,filtered back projection （FBP） technique and Omnipaque （350mg I/mL） as contrast medium. The CTDIvol,CT value, SD, CNR, FOM and image quality score were compared between the two groups. Results：The CTDIvol of the Low-kV group and the control group was （3.08±0.15）mGy and （6.08±0.57）mGy respectively, with significant statistic difference （P〈0.05）. The CT value of abdominal aorta, renal artery and mesenteric artery in the Low-kV group was （431.45 ±27.42） HU, （415.44 ± 16.51 ） HU, （311.85 ±17. 75） HU respectively, in the control group was （334.91±14.41）HU,（335.51±13.76）HU ,（312.63±18.59）HU respectively;the SD of abdominal aorta,renal artery and mesenteric artery in the Low-kV group was（15.96±1.75）,（18.68±3. 01）,（26.99±2.65） respectively,in the control group was （23.21 ± 2.91）, （25.34±2.67）, （29.8± 3.04） respectively;with significant statistic difference （P〈 0.05）. The CNR of abdominal aorta abdominal^s, renal artery and mesenteric artery in the Low-kV group was （26. 58± 2.93）,（25.77±2.52） ,（20.31±1.74） respectively,in the control group was （20.79±1.87）,（20. 82±1. 92）,（19.98±1.63） respectively;the FOM of abdominal aorta, renal artery and mesenteric artery in the Low-kV group was （233. 32 ±55.35） ,（218.46±45.44）,（135.51±24.74） respectively,in the control group was （72. 34±15. 45）,（72. 57±15. 62）, （66.71 ± 12.86） respectively; with significant statistic difference （P〈0.05）. The image quality score of the Low-kV group and the control group was （4.56±0.65） ,（4.55±0.73）
出处
《放射学实践》
北大核心
2016年第9期870-873,共4页
Radiologic Practice
关键词
正弦图迭代重建
滤波反投影
CT血管成像
辐射剂量
Sinogram affirmed iterative reconstruction
Filtered Back Projection
Computed tomography angiogra- phy
Radiation dose
