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Abstract #4261

Motion Tracking using Nonlinear Gradient Fields: Experimental Verification and Oblique Slices

Emre Kopanoglu1, Haifeng Wang1, Gigi Galiana1, and Robert Todd Constable1,2

1Diagnostic Radiology and Biomedical Imaging, Yale University, New Haven, CT, United States, 2Neurosurgery, Yale University, New Haven, CT, United States

Motion navigation using nonlinear gradient fields is demonstrated experimentally. The method makes use of the simultaneous multi-dimensional encoding capabilities of nonlinear gradient fields. A two-dimensional navigator image is obtained from a single-echo encoded using a nonlinear gradient field and multiple receiver coils. Without exceeding the maximum field generated by the linear gradient fields of a 3T scanner inside a 20cm isotropic field-of-view, the navigator can be acquired in under one millisecond, including its rewinder. The method can track both translational and rotational in-plane rigid body motion, as demonstrated in phantom experiments. Simulations show the method is applicable in oblique angles.

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