What is the primary purpose of using a rise/fall setting on the injector?

• A. Reduce catheter whip
• B. Increase image resolution
• C. Shorten the procedure time
• D. Increase patient sedation requirements

Answer: (A)

The rise/fall setting controls how gradually the contrast bolus is delivered, ramping the flow up at the start and down at the end. By smoothing the injection, it reduces abrupt pressure and jet forces that can push or move the catheter tip, known as catheter whip. This stabilization improves catheter control and image consistency during acquisition. The other options aren’t directly affected by how the injector ramps the flow: image resolution comes from imaging hardware and settings, not bolus ramp; procedure time isn’t shortened by ramping the flow; and sedation needs aren’t tied to the injector’s rise/fall behavior.