Fahrig R, Fox A J, Lownie S, Holdsworth D W
Department of Medical Biophysics, University of Western Ontario, London, Canada.
AJNR Am J Neuroradiol. 1997 Sep;18(8):1507-14.
To evaluate the potential use of a C-arm mounted X-ray image intensifier (XRII) system to generate three-dimensional computed rotational angiograms during interventional neuroradiologic procedures.
A clinical angiographic system was modified to allow collection of sufficient views during selective intraarterial contrast injections for CT reconstruction of a 15 x 15 x 15-cm3 volume. Image intensifier distortion and C-arm instabilities were corrected by using image-based techniques. The impact of the pulsatile nature of the vessels during image data acquisition and of the presence of bone on the 3-D reconstructions was investigated by generating 3-D reconstructions of an anesthetized 20-kg pig and of a human skull phantom.
A sequence of images sufficient for 3-D reconstruction was acquired in less than 5 seconds. Image intensifier distortion and C-arm instabilities were corrected to subpixel accuracy (0.035 mm and 0.07 mm, respectively). Both the intracranial vessels of the pig and the small, high-contrast structures in the skull were reconstructed with negligible artifacts.
Using a C-arm mounted XRII system, computed rotational angiography can provide true 3-D images of diagnostic quality.
评估在介入神经放射学手术过程中，使用C型臂安装的X射线图像增强器（XRII）系统生成三维计算机旋转血管造影的潜在用途。
对临床血管造影系统进行改造，以便在选择性动脉内注射造影剂期间收集足够的视图，用于对15×15×15立方厘米体积进行CT重建。通过使用基于图像的技术校正图像增强器失真和C型臂不稳定性。通过对一只麻醉的20千克猪和一个人类头骨模型进行三维重建，研究了图像数据采集期间血管搏动特性以及骨骼的存在对三维重建的影响。
在不到5秒的时间内采集到了足以进行三维重建的图像序列。图像增强器失真和C型臂不稳定性被校正到亚像素精度（分别为0.035毫米和0.07毫米）。猪的颅内血管和头骨中的小的高对比度结构都被重建，伪影可忽略不计。
使用C型臂安装的XRII系统，计算机旋转血管造影可以提供具有诊断质量的真实三维图像。
