Figure 1.

Patient examples of intrafraction motion as detected by the HDMM system.

This figure demonstrates intrafraction motion as detected by the HDMM system for two patients undergoing gamma knife treatment on the GK icon. The designated threshold for motion is indicated by the red line at 1.50 mm. The top panel shows a patient with minimal intrafraction motion. When there is sustained intracranial motion above the threshold, treatment is paused (as noted by the yellow region on the bottom panel).