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Abstract #3961

MRI Motion Compensation by Ultrasound Navigators

Benjamin Matthew Schwartz1, Nathan McDannold2

1Biophysics, Harvard University, Boston, MA, United States; 2Radiology, Harvard Medical School, Boston, MA, United States

A well-known technique to reduce motion artifacts uses MR navigator echoes to track the position of the object being imaged, and compensates for the motion using this position information. We demonstrate an analogous technique, tracking motion using A-line images from a single ultrasound transducer. The ultrasound data can be analyzed in real time for prospective motion correction, or processed offline for retrospective correction. Ultrasound navigation allows the use of unmodified pulse sequences, with attendant advantages in acquisition speed, steady-state polarization, and reduced engineering requirements. Future development includes multidimensional tracking and supplying position data to non-MR equipment.