基于ASIR技术的低管电压MDCT肾动脉成像的可行性研究  

ASIR- Based Low Tube Voltage MSCT Scanning for Renal Artery Angiography:Feasibility Study

作　　者：谢鹏[1] 查云飞[1] 姜伦[1] 陈顺新[1] 邵天喜[1] 

机构地区：[1]武汉大学人民医院放射科,430060

出　　处：《临床放射学杂志》2015年第1期128-132,共5页Journal of Clinical Radiology

摘　　要：目的探讨基于自适应统计迭代重建(ASIR)技术的低管电压MDCT肾动脉成像的可行性。方法将52例肾动脉CT成像患者随机分成A、B两组,每组26例,A组患者采用120 k V管电压,滤波反投影(FBP)重建算法,B组管电压为80 k V,30%ASIR重建算法,管电流均采用250 m A,注射流率4 ml/s,并以相同流率加注生理盐水30 ml。对120 k V组和80 k V组CT图像的客观指标、主观图像质量评分、CT剂量指数(CTDIvol)和剂量长度乘积(DLP)进行比较。结果与A组相比,B组腹主动脉、左侧肾动脉、右侧肾动脉CT值分别升高9.3%、10.7%、9.6%,B组腹主动脉、左侧肾动脉、右侧肾动脉噪声分别增加24.6%、28.2%、24.2%。80 k V组信噪比(SNR)、对比噪声比(CNR)均有所下降。两组腹主动脉、左侧肾动脉、右侧肾动脉CT值、噪声差异均有统计学意义。A组图像质量评分为优、良、差的例数分别为20、6、0,B组图像质量评分为优、良、差的例数分别为16、10、0,两组间图像质量评分差异无统计学意义。A、B两组的CTDIvol分别为12.66、4.00,DLP分别为328.26、103.73。与A组比,B组CTDIvol、DLP下降68.4%。结论基于30%ASIR技术的80 k V管电压MDCT肾动脉成像是可行的,能够在保证图像质量的前提下降低受检者的辐射剂量。Objective To investigate the feasibility of using ASIR - based low tube voltage combined with adaptive sta- tistical iterative reconstruction for renal artery multi - slice spiral CT （MSCT） angiography. Methods A total of 52 pa- tients were equally and randomly divided into 2 groups with 26 patients in each group. Tube voltage of 120kV, 250mA and FBP reconstruction algorithm were used in CT angiography of group A, while tube voltage of 80kV, 250mA and 30% ASIR reconstruction algorithm were used in CT angiography of group B. The contrast injection rate was 4.0 ml/s in both groups, and the same rate was employed in the additional injection of 30 ml saline. The objective and subjective image quality score, CT dose index volume （CTDIvol） and dose - length product （DLP） were determined, and the results were com- pared between the two groups. Results CT attenuation values of the abdominal aorta, left renal artery and right renal ar- tery in group B were 9.3%, 10.7% and 9.6% higher than those in group A respectively; while the image noise of the ab- dominal aorta, left renal artery and right renal artery in group B were 24.6% , 28.2% and 24.2% higher than those in group A respectively. In group B, both SNR and CNR were decreased. The differences in CT values of abdominal aorta, left renal artery and right renal artery and in image noise between the two groups were statistically significant. Excellent, good and poor image quality was seen in 20, 6 and 0 cases respectively in group A and was seen in 16, 10 and 0 cases re- spectively in group B ; and the differences between the two groups were not significant. CTD!vol of group A and group B was 12.66 and 4.00 respectively; and DLP of group A and group B was 328.26 and 103.73 respectively. Compared with group A, the CTDIvol and DLP of group B were reduced by 68.4%. Conclusion It is clinically feasible to use 30% ASIR - based 80kV tube voltage combined with adaptive statistical iterative reconstruction to perform renal artery MSCT angiogra- phy. In the premise of

关 键 词：肾动脉 体层摄影术 X线计算机 自适应性统计迭代重建 

分 类 号：R816.7[医药卫生—放射医学]