Rudin S, Bednarek D R, Guterman L R, Hopkins L N, Wakhloo A K, Fletcher L M, Massoumzadeh P
Department of Radiology, School of Medicine and Biomedical Sciences, State University of New York, Buffalo, USA.
Radiographics. 1995 Nov;15(6):1465-70. doi: 10.1148/radiographics.15.6.8577969.
In region-of-interest (ROI) fluoroscopy, a filter is used to greatly attenuate the x-ray beam outside the ROI and digital image processing is used to equalize the displayed brightness. The method is applicable to real-time imaging procedures such as vascular interventions for which a high-quality image is essential only over an ROI (eg, near the catheter tip), whereas the noise-degraded periphery may be acceptable for visualizing landmarks. Use of ROI fluoroscopy can greatly reduce radiation exposure to the patient and to staff while image quality in the ROI is maintained or improved. Exposure reduction factors greater than 5 were demonstrated for coil placement in a canine aneurysm model by using standard digital angiographic equipment operating in the road mapping mode. Potential applications for which future work will determine the clinical acceptability of ROI fluoroscopy include many of the highest-dose interventional procedures, in addition to general gastrointestinal fluoroscopy.
在感兴趣区域（ROI）荧光透视中，使用一个滤光器来大幅衰减ROI之外的X射线束，并采用数字图像处理来均衡显示的亮度。该方法适用于实时成像程序，如血管介入手术，对于此类手术，高质量图像仅在ROI（如导管尖端附近）上是必不可少的，而噪声退化的周边区域对于观察标志物可能是可以接受的。使用ROI荧光透视可以在保持或提高ROI图像质量的同时，大幅减少对患者和工作人员的辐射暴露。通过使用在路图模式下操作的标准数字血管造影设备，在犬类动脉瘤模型中进行线圈放置时，曝光减少因子大于5。除了一般的胃肠道荧光透视外，未来工作将确定ROI荧光透视临床可接受性的潜在应用还包括许多高剂量介入程序。
