320排CT全脑血管成像的应用价值及扫描方法优化  

Clinical value of 320-detector row CT whole-brain vascular angiography and optimization of the scanning method

作　　者：刘新立[1] 蒋元文[1] 陈敏[1] 赵芳[1] 周建玲[1] 姜东[1] 于江[1] 

机构地区：[1]克拉玛依市中心医院CT科,新疆834000

出　　处：《放射学实践》2012年第12期1311-1315,共5页Radiologic Practice

摘　　要：目的:探讨320排CT全脑动态血管造影(4DCTA)的应用价值及扫描方法的优化。方法:利用320排CT对56例(A组)病例行4DCTA检查,记录动脉、静脉峰值时间,以此为依据合理减少扫描期相,并以优化后的方法对92例(B组)病例行4DCTA,记录动脉、静脉峰值时间。两组病例进行容积再现(VR)及最大密度投影(MIP)血管重建及减影后处理,采用动态模式读片,评价血管的减影效果及图像质量,计算图像的信噪比(SNR)及记录辐射量。结果:4DCTA及优化后4DCTA两组动脉、静脉平均峰值时间分别为(17.92±3.15),(17.12±3.11)及(22.88±4.68),(22.34±3.60)s,组间差异无统计学意义(P=0.133及0.433,α=0.05)。两组图像的信噪比(SNR)分别为17.44±8.00及16.96±4.23,组间差异无统计学意义(P=0.640,α=0.05)。两组检查成功率为96.4%(54/56)及94.6%(87/92),组间差异无统计学意义(χ2=0.268,P=0.605,α=0.05)。两组间减影效果比较差异无统计学意义(χ2=0.052,P=0.818,α=0.05)。A组和B组扫描的有效辐射量ED值分别为5.39及2.29mSv。结论:320排CT 4DCTA的检查成功率高,减影效果好,高质量动态显示全脑血管,病灶显示好。优化后4DCTA明显减少辐射剂量并保证图像质量,具有很高的应用价值。Objective：To explore the image quality and the clinical value of whole-brain dynamic CT angiography （4D CTA）with 320-detector row CT and the optimization of the scanning method. Methods： 56 cases （Group A）underwent 4D CTA,the peak times of arteries and veins were recorded to optimize the scanning method. Then 92 cases （Group B） under- went 4D CTA with the optinized scanning method,the peak times of arteries and veins were recorded. All cases were post- processed with subtraction and reconstructed with volume rendering （VR） and maximum intensity projection （MIP）. The quality of images and subtraction results were evaluated by dynamic mode after vascular reconstruction, and the signal to noise ratio （SNR） and radiation dose were recorded. Results：The average peak times of arteries and veins by 4D CTA and optimized 4D CTA were 17.92±3.15,17.12±3.11 seconds and 22.88±4.68,22.34±3.60 seconds,and there was no sta- tistically significant difference （P=0. 133 and 0. 433,a = 0.05） between the two groups. The SNR of images of the two groups were 17, 44 ± 8.00 and 16.96±4.23, there was no statistically significant difference （P = 0. 640,α= 0. 05 ）. The success rates of imaging were 96.4%（54/56） and 94.6% （87/92）,there was no statistically significant difference （χ2= 0. 268, P= 0. 605,α= 0.05）, the subtraction results of two scanning methods was not statistically significant （χ2 = 0. 052, P=0. 818, α= 0.05）. The radiation doses （ED） in group A and group B were 5.39mSv and 2.29mSv, respectively. Conclu- sion：4D CTA with 320-detector row spiral CT has a high success rate of subtraction and better image quality in displaying lesions, dynamically displaying cerebral vessels. Optimized 4D CTA scanning method has a very high clinical value in reduc- ing the radiation dose and ensuring the image quality.

关 键 词：血管造影术 体层摄影术 X线计算机 辐射剂量 

分 类 号：R816.1[医药卫生—放射医学]