Ctisus Contrast Protocols Ctisus Ct Scanning The role of oral and iv contrast in computed body tomography: a problem driven "how to" program designed for radiology support staff, nursing, and referring physicians. elliot k. fishman, md, bea mudge, karen m. horton, md. the russel h morgan department of radiology. johns hopkins hospital. baltimore, md 21287. The original goal of ctisus nearly 25 years ago was to provide a source for ct scan protocols. today with numerous ct scan manufacturers around the world and with numerous makes and models of scanners constantly changing it is essentially impossible to provide a set of protocols for what would likely be 100 different scanners. therefore.
Ctisus Contrast Protocols Ctisus Ct Scanning 1. why do we use iv contrast material? 2. do you use serum creatinine levels or gfr in your practice for establishing risk prior to ct scanning? 3. what is gfr and why is it a more accurate measure than simply getting a creatinine level? 4. why are gfr numbers different for caucasians and african americans? 5. The scan is usually a single phase acquisition with a 30 35 second scan delay after injecting 100 120 cc om ioxehol at a rate of 4 5cc a second. the need for a second run will be dependent on factors including the presence of dissection, the possibility of a leaking aaa or even delayed renal function. The ideal protocol is oral contrast (750 1000cc of water over a 30 45 minute period) and dual phase iv contrast study. the two phases are arterial (30 second delay) and venous phase imaging (70 second delay). the scans use thin section ct (ideally .75 mm) and interscan spacing (.5mm) for isotrophic datasets. 750 1000 cc of oral contrast agents (positive or neutral agents) is ideal with the first cup given 20 30 minutes pre study and the last cup given when the patient sits on the scanner table. the last cup guarantees good distension.
Comments are closed.