Continuous Liver Tracking During Free Breathing MRI Guided Focused Ultrasound

Yuval Zur¹

MRI guided focused Ultrasound (FUS) tissue ablation of the liver during free breathing requires continuous tracking of all the points to be treated (target points) throughout the treatment so that the FUS transducer can deliver energy to the right position. We present a tracking method using the liver blood vessels. The tracking is done with a restricted FOV single shot EPI suitable for temperature measurement. At first the landmarks are assigned to the blood vessels. These landmarks are then tracked during heating. The location of the target point is found by 2D interpolation of the landmarks coordinates.