(ROI) Keyboard controlled identification of a given area of an image for numerical analysis and the area of anatomy being scanned that is of particular importance in the image. This area can also be a volume, than called (VOI) volume of interest.
A ROI can be used for purposes such as calculation of pixel statistics. ROI measurements should be made with the smallest area and away from boarders and edges to avoid partial volume averaging.

(RCBF) The regional cerebral blood flow is the evaluation of blood circulation in individual brain sections.

Reno-30® is a radiopaque contrast agent indicated for retrograde or ascending pyelography. Retrograde pyelography does not include systemic administration of contrast media, so the risk of adverse reactions is extremely rare.

Reno-60® is radiopaque contrast agent with a wide range of indications. Reno-60 should be at body temperature when injected and may need to be warmed before use. Following intravascular injection, iodinated contrast materials are transported through the bloodstream to the kidneys and excreted by glomerular filtration.

RenoCal®-76 (diatrizoate meglumine and diatrizoate sodium) was used as a contrast agent. Bracco Diagnostics, Inc. stated that the production of Renocal-76 has been discontinued due to reduced demand.