Sensors attached to the skin can ‘spy’ on product ultrasound scanners, allowing the position and orientation of the ultrasound probe to be inferred. These MR-compatible sensors can emit and/or receive ultrasound waves, they are small in size (about 3x3x1cm) and are easily fixed to the torso. In transmit-receive mode they can monitor physiological motion, and in receive-only mode they can monitor the motion of an ultrasound probe. The sensors can accompany subjects to serial MRI and ultrasound imaging exams and act as a common denominator between the two, allowing ultrasound images to be placed in the spatial context of MRI.
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