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.
KeywordsAttenuation Iodine Syringe Iodide Glucagon
Unable to display preview. Download preview PDF.
- 1.Mistretta CA: The use of a general description of the radiological transmission image for categorizing image enhancement procedures. Opt Eng 13:134–137, Mar-Apr 1974.Google Scholar
- 2.Mistretta CA, Kelcz F, Ort MG et al: Absorption-edge fluoroscopy using quasimonoenergetic x-ray beams. Investig Radiol 8: 402–412, 1973.Google Scholar
- 3.Kelcz F, Mistretta CA: Absorption edge fluoroscopy using a three-spectrum technique. Med Phys 3:159–168, May-June 1976.Google Scholar
- 4.Kruger RA, Mistretta CA, Crummy AB et al: Digital K-edge subtraction radiography. Radiology 125: 243–245, October 1977.Google Scholar
- 5.Kruger RA, Mistretta CA, Lancaster J et al: A digital video image processor for real-time x-ray subtraction imaging. Opt Eng 17:652–657, Nov-Dec 1978.Google Scholar
- 6.Kruger RA, Mistretta CA, Houk TL et al: Computerized fluoroscopy in real time for noninvasive visualization of the cardiovascular system-preliminary studies. Radiology 130: 49–57, Jan 1979.Google Scholar
- 7.Ergun DL, Mistretta CA, Kruger RA et al: A hybrid computerized fluoroscopy technique for noninvasive cardiovascular imaging. Radiology 132: 739742, Sept 1979.Google Scholar
- 8.Kruger RA, Mistretta CA, Crummy AB et al: Digital K-edge subtraction radiography. Radiology 125: 243–245, October 1977.Google Scholar
- 9.Ovitt TN, Nudelman SN, Fisher D et al: Computer-assisted video subtraction for intravenous angiography. Presented at the Work in Progress: General Diagnosis Session of the RSNA, Chicago, Illinois, November 27-December 2 1977.Google Scholar
- 10.Brenneke R, Brown RF,, Bursch J et al: Computerized video image processing with application to cardioangiographic roentgen image series. [In] Nagel HH, ed: Digital Image Processing. New York, Springer, 1977, p. 244.Google Scholar