摘要
目的:探讨16层螺旋CT冠状动脉造影的成像技术特点及对冠状动脉的显示能力。材料和方法:46例窦性心律患者,按心率分为6组:组1心率为<60次/min,组2心率为60～69次/min,组3心率为70-79次/min,组4心率为80～89次/min,组5心率为90～99次/min,组6心率为≥100次/min。经肘前静脉注射造影剂,平静吸气后屏气进行扫描。采用回顾性心电门控技术。并将图像传送到SUN图像工作站进行二维曲面重建、最大密度投影重建、容积再现重建。结果:46例患者中,左冠状动脉主干、左前降支、第一对角支、左回旋支、左缘支、右冠状动脉及后降支显示较好并能用于影像学诊断者分别为46例(100％),46例(100％),41例(89％),43例(94％),24例(52％),39例(85％),27例(59％)。在相位窗的选择方面,36例(78％)患者在75％相位窗上显示较好。在不同的心率组中,16层螺旋CT对左冠状动脉主干、左前降支及后降支的显示没有明显差别(P>0.05)。左冠状动脉主干和左前降支的显示受心脏搏动的影响很小,显示率都是100％。心脏搏动主要影响右冠状动脉、左旋支及第一对角支的显示,组间差异具有统计学意义(P<0.05)。当心率小于70次/min时,右冠状动脉显示较好,显示率为100％。当心率小于80次/min时左旋支的显示率在93％以上。结论:16层螺旋CT可以准确可靠地进行?
Purpose: To explore the optimal imaging technique of coronary angiography with 16 - slice multislice spiral computed tomography(MSCT) and its ability to demonstrate coronary artery branches. Materials and Methods: According to the heart rate, 46 patients with sinus rhythm were classified to the six groups: group 1, ≤ 60 beats/min; group 2, 60-69 beats/min; group 3, 70- 79 beats/min; group 4, 80-89 beats/min; group 5, 90-99 beats/min; group 6, ≥100 beats/min. Intravenously contrast enhanced 16 - slice synchronised MSCT coronary angiography was achieved during a single breath hold, and ECG images were reconstructed retrospectively. All axial images were transfered to an external workstation for 2D curved reformat, maxium intensity projection and volume rendering reconstruction. Results: Image quality was sufficient for diagnosis in 46 cases(100%) of left main (LM), 46 cases(100%) of left anterior descending (LAD), 41 cases(89%) of 1st diagonal, 43 cases(94%) of left circumflex(LCx), 24 cases(52%) of left marginal, 39 cases(85%) of right coronary artery(RCA) and 27 cases(59%) of posterior descending artery (PDA) .36 cases (78%) got optimal image quality in 75% R - R interval. For different heart rates, There is no significant difference with 16 - slice MSCT for the demonstration of left main, left anterior descending and posterior descending artery (P > 0.05) . Heart rate mainly affect the demonstrate of right coronary, left circumflex and 1st diagonal and have significant difference between groups (P < 0.05) . Conclusion: 16 - row multislice spiral computed tomography is a promising technique for noninvasive screening and diagnosis of coronary artery disease, and sometimes it is heart rate related.
出处
《中国医学计算机成像杂志》
CSCD
2004年第1期18-22,共5页
Chinese Computed Medical Imaging
