APPLICATION OF REGION-OF-INTEREST IMAGING TECHNIQUES TO NEUROINTERVENTIONAL RADIOLOGY

To reduce radiation exposure to patients and staff during neurointerve ntional procedures, region-of-interest (ROI) techniques were used with fluoroscopy, road mapping, and digital subtraction angiography in 19 patients. ROI filters, made of multiple layers of gadolinium, were att ached to the collimators. Patient skin exposure was reduced by a facto r of 3.3-10.0 across 85% of the field of view, and exposures were redu ced to below thresholds for skin effects.