Alperin N, Levin D N, Pelizzari C A
Department of Radiology, University of Chicago Hospitals, IL 60637.
J Magn Reson Imaging. 1994 Mar-Apr;4(2):139-44. doi: 10.1002/jmri.1880040207.
Conventional x-ray angiography (XRA) images are projections of the vasculature with high spatial and temporal resolution, while magnetic resonance (MR) angiography (MRA) and MR imaging data show the three-dimensional locations of vessels relative to brain parenchyma. The authors have developed a retrospective method of registering these studies, which makes it practical to produce multimodality displays of this complementary information. Registration was performed by matching vessels seen on both XRA and MRA images. First, the authors determined the coordinates of the center lines of a few "landmark" vessels on the XRA image and the three-dimensional locations of the corresponding intraluminal voxels in the MRA volume. Registration was performed by rotating and translating the MRA-MR imaging volume until the perspective projection of the MRA landmark vessels matched the corresponding vessel center lines on the XRA image. Experiments with phantoms and patients indicated that the two studies were registered with an average error of less than 2 mm. A linked-cursor display was developed to show correspondence between points on the registered XRA and MRA-MR images.
传统的X射线血管造影（XRA）图像是具有高空间和时间分辨率的脉管系统投影，而磁共振（MR）血管造影（MRA）和MR成像数据则显示血管相对于脑实质的三维位置。作者开发了一种对这些研究进行配准的回顾性方法，这使得生成这种互补信息的多模态显示成为可能。通过匹配XRA和MRA图像上看到的血管进行配准。首先，作者确定了XRA图像上一些“地标”血管中心线的坐标以及MRA容积中相应管腔内体素的三维位置。通过旋转和平移MRA-MR成像容积进行配准，直到MRA地标血管的透视投影与XRA图像上相应的血管中心线匹配。对模型和患者进行的实验表明，两项研究配准后的平均误差小于2毫米。开发了一种联动光标显示，以显示配准后的XRA和MRA-MR图像上各点之间的对应关系。
