Fig.1.

Experimental setup for phantom motion study. An MRI-compatible motion platform was used to create one-dimensional motion to simulate breathing artifacts during hyperthermia treatment. An aluminum disk was taped at the end of a plastic rod to introduce temperature artifacts (A). Reference images (1) for temperature mapping were acquired prior to the treatment with motion being held. HIFU started during first breath hold (2). Artifacts on temperature map were observed (3) when sinusoidal motion was introduced; HIFU was disabled during this period. Treatment resumed when motion was paused with HIFU enabled (4).