CLINICAL-APPLICATION OF REGION-OF-INTEREST TECHNIQUES TO RADIOLOGIC IMAGING

In region-of-interest (ROI) imaging, a filter with a central aperture is used to substantially reduce patient dose outside of an ROI while m aintaining or improving image quality within the ROI. The benefits of ROI imaging can be realized bf using standard imaging equipment, ROI i maging has been clinically applied to gastrointestinal radiology and i nterventional procedures, In gastrointestinal procedures, ROI fluorosc opy without image processing can be used without adversely affecting t he procedure or interfering with spot radiography, ROI fluoroscopy can reduce the dose-area product by a factor of 1.7 for gastrointestinal procedures, In interventional neuroradiologic procedures, equalized di splay brightness is achieved with road mapping during fluoroscopy and with standard digital subtraction techniques during angiography. in in terventional radiology, ROI filters can generally reduce the patient s kin dose to levels below the threshold for skin effects, thus eliminat ing these effects across more than 85% of the field of view.