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PubMed · 385547

Real-time digital K-edge subtraction fluoroscopy.

T L Houk·R A Kruger·C A Mistretta·S J Riederer·C G Shaw·J C Lancaster·D C Flemming
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Abstract

We report in vitro and in vivo trials of K-edge fluoroscopy, by which iodine contrast concentration is displayed live, with tissue and bone images suppressed, free of patient-motion artifacts. Iodine and cerium, 125 and 225 mg/cm2 respectively, filter alternate TV fields of cine-pulsed 50 KVP x-rays. Weighted subtraction of successive TV fields isolates the iodine image and simultaneously minimizes artifacts. Digital techniques are used in real time. At our present x-ray tube limit, 500 mA instantaneous current, the patient exposure is 180 mR/sec and quantum mottle limits the image quality. Integrating four successive difference images provides a compromise between mottle and smoothly moving displays. Cardiovascular images of a 17-kg dog, using 1 ml/kg Renografin-60 injected into a foreleg vein, show that a 15-cm chest thickness is our present practical maximum. This method may be useful in diagnosing cardiovascular anomalies in infants without catheterization or suspension of breathing.

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AnimalsContrast MediaDogsFluoroscopyHeartIodineModels, StructuralSubtraction TechniqueJournal ArticleResearch Support, U.S. Gov't, Non-P.H.S.

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T L Houk, R A Kruger, C A Mistretta, S J Riederer, C G Shaw, J C Lancaster, D C Flemming. Real-time digital K-edge subtraction fluoroscopy.. https://doi.org/10.1097/00004424-197907000-00002

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