脑CT血管造影仿真外视镜成像技术与临床价值

Techniques and clinical value of external 3D shaded - surface reconstruction of cranial CT angiography

目的 探讨脑CT血管造影(CTA)仿真外视镜重建技术、方法与临床价值。方法 采用仿真外视镜和最大强度投影(MIP)、表面遮盖显示(SSD)、仿真内镜(VE)等多种后处理技术,对8例脑CTA进行后处理重建成像,并与DSA作对照。结果 仿真外视镜、MIP、SSD重建均获得了脑动脉整体三维血管解剖,以仿真外视镜成像揭示脑血管及其病变效果最佳。仿真外视镜重建时间最少,其对颅底血管结构的展示以轴位效果最佳,能清晰、准确展示动脉瘤与载瘤动脉、脑动脉与邻近颅底骨尤其垂体窝等骨性解剖结构的毗邻关系,无须剪辑去除颅骨影像,且颅骨、血管影像相得益彰。VE仅揭示血管内腔解剖信息。结论仿真外视镜成像是脑CTA颇为有效、无创性三维显示脑血管及其病变的重建技术,具有极大的临床应用价值。

Purpose To explore the techniques and clinical value of external 3D shaded-surface reformation(ESSR) of cranial CT angiog-raphy(CTA) . Methods Cranial CTA data sets of eight cases were imaging processed using ESSR and MIP, SSD, virtual endoscopy(VE) by navigator software. All patients were underwent DSA examination for comparison. Results Images of ESSR, MIP and SSD demonstrated whole 3D structure relation of cerebral arteries. The reconstructed time of ESSR was less than that of MIP and SSD with cutting technique. Images of ESSR without cutting images of cranial bones accurately depicted the 3D anatomy of circle of Willis, aneurysm and base bones. And VE detected only inner surface of cranial artery and aneurysm. Conclusion ESSR is the best imaging processing techniques of cranial CTA, and it depicts clearly 3D anatomy of cranial artery, aneurysms and cranial bones.