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Show Tt Dtify Utcfc ChronSdf, Monday, January 4, 1S32 0 At U Medical Center 5 FJv New angiographic method University Medical Center Radiologists have developed an alternative to the type of angiography now used which may be safer, more accurate, less exensive and easier to implement than any technique currently available to study the anatomy of arteries. Called "lime domain filtering" or "continuous recursive filtering,", the technique is an extension of the subtraction imaging concepts that recently have made intravenous angiography a clinical teality. "It's been used on lOpatientsand the results are extremely promising," said Robert A. Kruger, Ph.D., the research assistant professor of radiology who helped develop the instru- ment. "Filtering is an esH'c ially valuable tool in the disgnosis and treatment of atherosclerosis, and it can also be used lo assess and diagnose .cardiac illness and to monitoi patients who've had heart problems." Dr. Kruger. a physicist, says this filtering technique is similar to conventional digital subtrac tion angiography, but is simpler and less expensive to implement. "In digital subtraction angiography, the image of a body pari is first "masked" and stored as a series of numbers. Contrast materials are then injected, after whic h timea series of images is stored and sequentially subtracted Iroin the 'mask.' "Kinder stated. "For the pioccdme to be successful. (Inpatient in ust remain absolutely still, and there must be an intense enough beam of so that there's little noise interference, i.e.. the same dosage as a tegular would X-ra- y require." Subtraction angiography iseiledive if the patient does not nunc between the time the mask is taken and the time the contrast matetial reaches the arterv seconds i. Dining the rapid pi ot ess between the two images, bones, organs, and otliei extraneous ( 0 structures are eliminated, leaving a very dim image of the arteries, which can then by computer. "Our instrumentation does not subtract the two images, but the filtering makes it look as if it had. Filtering isolates the flow of contrast material by virtue of a priori knowledge of its probable variation with time." Kruger said. "For example, filtering angiography can isolate image variation that c hanges every five a seconds or so," Kruger said. "It removesevents that vary more slowly, such as stationary anatomical parts, or faster, such as cardiac motion." The I'tah physicist said the filtering technique has several advantages over A new technique to study the anatomy of arteries called "time domain filtering" has been developed at the University Medical Center. Dr. Robert A. Kruger. research assistant professor of radiology, in one of the radiologists responsible for the development of the technique. The diagnostic instrument uses a lower dose of radiation and is less expensive than the current instruments being used. subtraction angiography. "It uses a lower dose of radiation. Filtering angiography costsonly half as much, requires a far less sophisticated fluoroscopy system, and the necessary equipment can he retrofitted to existing equipment." Kruger said. When filtering angiography equipment is manufactured it will be portable, eliminating the need for a room. Video tapes special purpose studies can be performed, or the videoimage can be made in to a transparency l ha looks like an Another advantage, according to Kruger. is X-ra- y WINTER QUARTER RUSH HOURS I X-ra- y. that technicians can see the finished product an be lelt on as the procedure-evolvecontinuously to create a moving picture ol changes going on inside the artery. "Intravenous angiography using filleting techniques is most successlul on the head', nee k and pet iphetal ai teries." Ki ugei said. "Il less elleelive in areas wheie banc e ol unwanted motion, sue h as the lung. 01 the abdomen, where even a small amount of bowel gas an cause motion at l i facts. " is somewhat lime's a greater e c lil I I Saturday Jan. 2nd Monday Jan. 4th Tuesday Jan. 5th Wednesday Jan. 6th I X Jill L o 0 am 8 am 8 am 8 am to 3 pm to 7 pm to 7 pm to 7 pm save SAVE TOTEM FOOD SBBOTCE JEST mom on "sk 4 WEEK PLAN Reg. Price $ Saver Price Total Cost Saved Breakfast, Lunch or Dinner only 3.10 2.25 45.00 27 Breakfast Lunch and Dinner 8.70 6.20 124.00 29 Breakfast, Lunch or Dinner only 3.10 2.25 117.00 27 Breakfast and Lunch 5.95 4 10 213.00 31 Breakfast, Lunch and Dinner 8.70 6.15 319.00 30 QUARTER PLAN 77t SIGN UP NOW IN CAFETERIA OFFICE . I University Bookstore American Cancer Society 5 e BMlWE 1 |
