Ericson K, Söderman M, Maurincomme E, Lindquist C
Department of Neuroradiology, Karolinska Hospital, Stockholm, Sweden.
Stereotact Funct Neurosurg. 1996;66 Suppl 1:63-70. doi: 10.1159/000099771.
Recently developed software for correction of the geometric distortion in digital subtraction angiography was tested clinically. Localization and subsequent radiosurgical treatment of intracranial arteriovenous malformations was undertaken in 60 patients. During each angiographic series, a series of grid images was also acquired. All images were transferred to a workstation where the grid images were compared to a previously stored ideal image of the grid. A distortion correction was then performed on the grid images. The same pixel-by-pixel correction was applied to the respective angiographic images. The target was outlined on corrected subtracted images on the monitor. The outlined regions of interest and reference points were transferred to another workstation for dose planning, and the treatment was subsequently executed in the Gamma Knife unit. The clinical applicability of the distortion correction program was tested and possible sources of error examined. The experience gained is being used for further development of the software and for smoother data management and reduction of the processing time.
最近开发的用于校正数字减影血管造影术中几何畸变的软件进行了临床测试。对60例颅内动静脉畸形患者进行了定位及后续的放射外科治疗。在每次血管造影系列检查期间，还采集了一系列网格图像。所有图像都被传输到工作站，在那里将网格图像与先前存储的理想网格图像进行比较。然后对网格图像进行畸变校正。对相应的血管造影图像应用相同的逐像素校正。在监视器上的校正后的减影图像上勾勒出靶区。勾勒出的感兴趣区域和参考点被传输到另一个工作站进行剂量规划，随后在伽玛刀装置中进行治疗。测试了畸变校正程序的临床适用性，并检查了可能的误差来源。所获得的经验正用于软件的进一步开发以及更顺畅的数据管理和处理时间的减少。
