大脑后动脉螺旋CT最大密度投影分段显示后处理参数的优化及相关分析

Optimization and correlation analysis of CTA-MIP segmentation post-processing parameters in posterior

目的探究大脑后动脉螺旋CT最大密度投影(CTA-MIP)分段显示与层厚、旋转角度等参数的相关性,确定大脑后动脉的各分段优化主显体位。方法利用CTA-VR平台,对入组病例分别测量大脑后动脉P1-2段及P2-4段走形跨越厚度及空间角度,把测量参数的修正值在CTA-MIP平台进行验证,形成各分段的层MIP主显体位图像,对主显体位图像质量进行评分,确定CTA-MIP各分段的优化主显体位的厚度及旋转角度。结果大脑后动脉P1-2段首选主显体位:标准轴位显示,层厚15mm,偏移角度0°;大脑后动脉P2-4段首显主选体位:外旋矢状位显示,层厚25mm,外旋角度15°。结论通过优化CTA-MIP层厚、角度变换,CTA-MIP-P1-2段及P2-4段的优化主显体位能够清晰、快速地显示大脑后动脉各段的主支及主要分支,为大脑后动脉的影像学显示提供了全新的方法及理念。

Objective To investigate the correlation between posterior cerebral artery CTA-MIP segmentation and parameters such as layer thickness, rotation angle and so on. Methods The CTA-VR platform was used to measure the traverse thickness and spatial angle of P1-2 and P2-5 in the posterior cerebral artery. The corrected values of the measured parameters were verified on the CTA-MIP platform to form the sub-components MIP primary dominant position of the image layer, the dominant position of the image quality grading to determine the CTA-MIP each subsection of the optimized dominant position of the thickness and rotation angle. Results The main dominant posterior segment of P1-2 segment of the posterior cerebral artery was selected： the standard axis showed a thickness of 15 mm and an offset angle of 0°. The main dominant posterior segment of the P2-4 segment of the posterior cerebral artery was located outside the sagittal plane, 25 mm, external rotation angle of 15°. Conclusion Optimizing the dominant predominance of CTA-MIP layer thickness, angle transformation, CTA-MIP-P1-2 and P2-4 can clearly and rapidly display the major and major branches of the segments of the posterior cerebral artery. Imaging of the posterior arteries provides a completely new approach and philosophy.