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.
