Department of Gastroenterology, West China Hospital, Sichuan University, 37 Guoxue Lane, 610041, Chengdu, Sichuan Province, China.
Department of Gastroenterology, Tibetan Chengdu Branch Hospital of West China Hospital, Sichuan University, No. 20, Heng Street, Ximian Bridge, 610041, Chengdu, Sichuan Province, China.
Sci Rep. 2018 Oct 26;8(1):15852. doi: 10.1038/s41598-018-34153-9.
During interventional procedures, the deficiencies of nonstereoscopic vision increase the difficulty of identifying the anteroposterior direction and pathways of vessels. Therefore, achieving real-time stereoscopic vision during interventional procedures is meaningful. Pairs of X-ray images were captured with identical parameter settings, except for different rotation angles (represented as the α angle). The resulting images at these α angles were used as left-eye and right-eye views and were horizontally merged into single left-right 3D images. Virtual reality (VR) glasses were used for achieving stereo vision. Pairs of X-ray images from four angiographies with different α angles (1.8-3.4°) were merged into left-right 3D images. Observation with VR glasses can produce realistic stereo views of vascular anatomical structure. The results showed that the optimal α angles accepted by the brain for generating stereo vision were within a narrow range (approximately 1.4-4.1°). Subsequent tests showed that during transcatheter arterial chemoembolization, 3D X-ray stereoscopic images provided significantly improved spatial discrimination and convenience for identifying the supply vessels of a liver tumor and its anteroposterior direction compared with plain X-ray images (all P < 0.01). Real-time X-ray stereoscopic vision can be easily achieved via the straightforward method described herein and has the potential to benefit patients during interventional procedures.
在介入手术中，非立体视觉的缺陷增加了识别血管前后方向和路径的难度。因此，在介入手术中实现实时立体视觉是有意义的。使用相同的参数设置拍摄一对 X 射线图像，除了不同的旋转角度（表示为α角）。这些α角的图像分别作为左眼和右眼视图，并水平合并成单个左右 3D 图像。使用虚拟现实（VR）眼镜实现立体视觉。将来自四个具有不同α角（1.8-3.4°）的血管造影术的 X 射线对合并成左右 3D 图像。使用 VR 眼镜观察可以产生血管解剖结构的逼真立体视图。结果表明，大脑生成立体视觉的最佳α角范围很窄（约 1.4-4.1°）。随后的测试表明，与普通 X 射线图像相比，在经导管动脉化疗栓塞术中，3D X 射线立体图像显著提高了空间辨别能力，并方便了识别肝肿瘤的供血血管及其前后方向（均 P<0.01）。通过本文所述的简单方法可以轻松实现实时 X 射线立体视觉，并且有可能在介入手术中使患者受益。
