Real-Time Digital K-Edge Subtraction Fluoroscopy
| Autor: | T. L. Houk, Robert A. Kruger, Stephen J. Riederer, Jerome C. Lancaster, Charles A. Mistretta, David C. Flemming, C. G. Shaw |
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| Rok vydání: | 1979 |
| Předmět: |
Materials science
medicine.diagnostic_test Image quality media_common.quotation_subject Subtraction Contrast Media Heart General Medicine Patient exposure Filter (signal processing) medicine.disease Models Structural Dogs K-edge Fluoroscopy Subtraction Technique medicine Animals Contrast (vision) Radiology Nuclear Medicine and imaging Mottle Iodine media_common Biomedical engineering |
| Zdroj: | Investigative Radiology. 14:270-278 |
| ISSN: | 0020-9996 |
| DOI: | 10.1097/00004424-197907000-00002 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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