Intravenous Angiography Using Computerized Fluoroscopy Apparatus
Following several years of development and testing using animals, a digital image processor designed to perform generalized subtraction imaging tasks has been interfaced to an image-intensified television fluoroscopy apparatus in the University of Wisconsin Clinical Sciences Center. So far, 175 patients have been examined using three time-subtraction modes. In Mask-Mode-Radiography, images of opacified arteries are subtracted from a mask image obtained just prior to the arrival of iodine injected into an antecubital vein. Fully processed subtraction images are obtained at a rate of about one per second and stored on a video disc in real time. This mode is used for all arteries outside of the heart and may be ECG-gated for cardiac imaging. Left ventricular motion is well visualized in Mask Mode Fluoroscopy. In this mode the mask is taken prior to the injection of contrast. Then 60 subtraction images per second are stored on video tape. For wall motion studies this can be done at conventional fluoroscopic exposure levels. We have had limited success in seeing coronary bypass grafts and coronary arteries, but further improvements are needed. In Time Interval Difference Mode short term changes in iodine concentration are displayed. This mode is obtained from Mask Mode Fluoroscopy by reprocessing.
KeywordsMask Image Coronary Bypass Graft Video Disc Analog Storage High Exposure Rate
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