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Experimental setup for in vivo pig study. Both the animal and transducer were tracked by BrainSight neuronavigation system with an individual optical tracker. The pig head was immobilized by a bite bar and two side-supports. The transducer was coupled to the pig head through a water chamber. The location of one fiducial marker on the side of the pig head was marked by a circle. Fiducial markers were also attached to the side support and water chamber as backups.
