1. A system, comprising: an imaging scanner configured with an examination region and to scan the examination region; an interventional apparatus including an interventional instrument affixed to a catheter, and configured for an image-guided interventional procedure of a patient with a region of interest positioned in the examination region of the imaging scanner, the interventional apparatus including a position detector configured for location outside the examination region that detects changes in position of the interventional instrument moving within the examination region based on movement of the catheter and generates a movement signal indicative of the detected changed position; and wherein the imaging scanner includes a controller that activates the imaging scanner based on the movement signal from the interventional apparatus to scan the examination region for one or more data acquisition cycles.