FutuRAD: Work in Progress
| Autor: | Gerhard Lechner, Johannes Lammer, Siegfried Thurnher, Wolfgang Dock, B Niederle, E K Lang, Oswald Graf, K L Eibenberger, R Wildling |
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| Rok vydání: | 1994 |
| Předmět: | |
| Zdroj: | Radiology. 190:43A-49A |
| ISSN: | 1527-1315 0033-8419 |
| DOI: | 10.1148/radiology.190.2.43a |
| Popis: | PURPOSE: To determine the optimal time window for scanning the liver with computed tomography (CT) during arterial portography (CTAP). MATERIALS AND METHODS: After vasodilation and contrast medium injection into the superior mesenteric artery (80 mL at 5 mL/sec), 25 repeated scans were obtained at a single level within 83 seconds in 13 patients. Attenuation was measured on every scan, and time-attenuation curves were created. Enhancement characteristics of the portal vein, liver parenchyma, aorta, and tumors were evaluated. RESULTS: Parenchymal enhancement of more than 60 HU was achieved between 18 seconds +/- 4 (standard deviation) and 67 seconds +/- 15, and high parenchyma-to-tumor contrast of more than 50 HU occurred between 18 seconds +/- 3 and 62 seconds +/- 14. CONCLUSION: To scan the liver within such a narrow time window, a spiral CT technique is necessary. When the above injection parameters are used in CTAP, the spiral CT sequence should be started 20 seconds after the beginning of the injection. |
| Databáze: | OpenAIRE |
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