TimeMIP技术对提高双下肢CTA足部区域血管成像质量的应用研究  

Application of TimeMIP Technology in Improving the Quality of Vascular Imaging in Foot Area of CTA of Lower Limbs

作　　者：孙宇飞 钟朝辉[1] 吴柯薇 李向明 王卫丰 SUN Yufei;ZHONG Chaohui;WU Kewei;LI Xiangming;WANG Weifeng(Department of Radiology,Beijing Friendship Hospital,Capital Medical University,Beijing 101100,China)

机构地区：[1]首都医科大学附属北京友谊医院放射科,北京101100

出　　处：《中国医疗设备》2022年第2期82-84,93,共4页China Medical Devices

摘　　要：目的探讨基于时间的最大密度投影(Time Maximum Intensity Projection,TimeMIP)技术对双下肢血管成像中双足区域血管图像质量的影响。方法选取50名糖尿病疑诊双下肢血管病变的受检者。在行常规双下肢CTA扫描后,延时10 s对受检者足部区域行160 mm宽度轴位低剂量扫描。以双下肢CTA扫描足部区图像为对照组,延时扫描图像经TimeMIP处理后图像为实验组。分别测量两组图像的足背、足趾部动脉的CT值,并计算信噪比(Signal to Noise Ratio,SNR)及有效辐射剂量。并对两组图像进行后处理,以4分制进行主观评分。结果两组患者均顺利完成检查,实验组足背、足趾部动脉的CT值分别为(150.44±8.67)、(137.20±10.67)HU,对照组分别为(123.36±8.61)、(123.32±10.97)HU,差异有统计学意义(P<0.05);实验组足背、足趾部动脉的SNR分别为9.11±0.96、9.38±1.22,对照组分别为8.11±0.93、8.35±1.83,差异无统计学意义(P>0.05)。实验组图像经MIP、VR处理后主观评分为(3.23±0.18)分,对照组为(2.11±0.20)分,经Mann-Whitney U检验差异有统计学意义(P<0.05)。结论TimeMIP技术可有效提高双下肢CTA足部区域动脉血管图像质量。Objective To discusses the effect of time maximum intensity projeetion(TimeMIP)technology on the image quality of bipedal vascular image in CTA of lower limbs.Methods A total of 50 patients with suspected double lower extremity vascular disease were selected.After routine CTA scanning of the lower extremities,a low-dose scan of 160 mm width axial position of the subject’s foot region was performed with a delay of 10 s.The images of the foot area scanned by CTA of the double lower extremities were group A,time-lapse scanned images processed by TimeMIP were group B.The CT value of dorsum and toe arteries were measured respectively,and signal to noise ratio(SNR)and effective radiation dose were calculated.The images were postprocessed and subjective scores were given on a 4-point scale.Results Patients in both groups successfully completed the examination.The dorsum and toe arteries were measured.The CT values were(150.44±8.67)and(137.20±10.67)HU in the experimental group,and(123.36±8.61)and(123.32±10.97)HU in the control group,which were statistically significant(P<0.05).The SNR of dorsum and toe arteries were 9.11±0.96 and 9.38±1.22 in the experimental group and 8.11±0.93 and 8.35±1.83 in the control group,which showed no statistically significant difference(P>0.05).After MIP and VR processing,the subjective scores of the two groups were(3.23±0.18)scores in the experimental group and(2.11±0.20)scores in the control group,respectively,and the difference was statistically significant by Mann-Whitney U test(P<0.05).Conclusion TimeMIP technology can effectively improve the image quality of CTA foot artery vessels in both lower limbs.

关 键 词：TimeMIP技术 下肢血管 低剂量 多层螺旋CT 血管成像 

分 类 号：R816.2[医药卫生—放射医学]