Abstract #4261

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

Emre Kopanoglu¹, Haifeng Wang¹, Gigi Galiana¹, and Robert Todd Constable^1,2

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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