Any piece of program code in a high-level language which, when (if) its execution terminates, returns a value. In most programming languages, expressions consist of constants, variables, operators, functions, and parentheses. The operators and functions may be built-in or user defined.
If oral contrast is required, about 45 to 60 minutes is needed for the contrast to move through your digestive tract. Actual scan times vary from a few seconds to several minutes. If no oral contrast is required, the examination will take about 15 to 30 minutes, including the time for intravenous preparation and interview. In some cases additional scanning is required as scans are tailored to suit individual diagnostic needs.
The prep for the test usually takes longer, as it may involve drinking oral contrast for around an hour before the scan, as well as the time it takes the tech or nurse to start your IV in order to inject the IV contrast if it is called for.nswers. Best Answer: This depends on a number of things, probably the most important being whether or not contrast is used. If contrast is used, it will take longer, because they do a scan, then inject contrast, then scan again to see what looks different.