双低扫描技术结合双源CT Flash Spiral模式在冠状动脉成像中的应用

发布时间：2018-06-30 17:27

本文选题：对比剂 + 低浓度　；参考：《临床放射学杂志》2016年09期

【摘要】：目的探讨双源CT Flash Spiral扫描模式下,270碘对比剂结合低管电压及正弦确认迭代重组(SAFIRE)技术在改善冠状动脉成像图像质量及降低辐射剂量中的价值。方法将平均心率65次/分的82例疑诊冠心病患者随机分为A、B两组,A组42例,采用管电压120 k V、350 mg I/m L的对比剂,重组图像采用滤过反投影(FBP)法;B组40例,采用管电压80 k V或100 k V、270 mg I/m L的对比剂,重组图像同时采用FBP法(B1组)和SAFIRE法(B2组)。A、B两组均采用Flash Spiral模式扫描,采集图像时间为R-R间期60%。记录剂量长度乘积(DLP),计算有效辐射剂量(ED)。测量A组与B组两种重组法主动脉根部、左冠状动脉及右冠状动脉起始部血管内CT值和图像噪声(SD),计算主观图像质量评分、图像噪声(SD)、信噪比(SNR)、对比噪声比(CNR)。结果 A、B两组的ED分别为(1.18±0.21)m Sv、(0.55±0.19)m Sv,差异有统计学意义(t=14.22,P0.01);A组与B组两种重组法B1、B2冠状动脉图像质量评分分别为1.57±0.60、1.85±0.59、1.55±0.60,SD分别为(17.62±2.44)HU、(27.25±8.06)HU、(19.21±6.21)HU,B1与B2组间均有显著统计学差异(P0.01),A与B2组间均无统计学差异(P0.05);血管内强化CT值、SNR、CNR B2组均高于A组,有统计学差异(P0.05)。结论双源CT Flash Spiral扫描模式下,270碘对比剂结合低管电压及SAFIRE技术能明显降低辐射剂量,并能获得较好的图像质量。
[Abstract]:Objective to investigate the value of double source CT Flash Spiral scan with low tube voltage and sinusoidal confirmation iterative recombination (SAFIRE) in improving the image quality of coronary artery imaging and reducing the radiation dose. Methods Eighty-two patients with suspected coronary heart disease with an average heart rate of 65 beats / min were randomly divided into two groups: group A (n = 42) and group B (n = 40). The tube voltage of 80 kV or 100 kV of 270 mg I / mL was used. The reconstructed images were scanned by Flash Spiral mode in both groups of FBP (B1 group) and SAFIRE (B2 group). The dose length product (DLP) was recorded and the effective radiation dose (Ed) was calculated. Intravascular CT value and image noise (SD) of aortic root, left coronary artery and right coronary artery in group A and group B were measured, and subjective image quality scores, image noise (SD), signal-to-noise ratio (SNR) and contrast noise ratio (CNR) were calculated. Results Ed was (1.18 卤0.21) mSvand (0.55 卤0.19) mSvin in group A and group B, respectively. There was significant difference between group A and group B in the image quality of coronary artery between group A and group B respectively (1.57 卤0.601.85 卤0.591.55 卤0.60 SD = (17.62 卤2.44) HUU, (27.25 卤8.06) HUU, (19.21 卤6.21) HUB1 and B2 groups, respectively. There was no statistical difference (P0.05), the value of enhanced intravascular CT was significantly higher in the CNR B2 group than in the A group. There was statistical difference (P0.05). Conclusion under the dual-source CT Flash Spiral scan mode, the low tube voltage and SAFIRE can significantly reduce the radiation dose and obtain better image quality with the combination of low-tube voltage and SAFIRE.
【作者单位】：兰州石油化工公司总医院放射科;
【分类号】：R816.2;R541.4

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