Motion Navigation using Non-Linear Gradient Fields

Nonlinear gradient fields vary along multiple spatial directions. Therefore, spatial information along multiple directions is encoded simultaneously. By using an array of receiver coils, the spatial variation along different directions can be recovered. In this study, this encoding capability is exploited to reconstruct low-resolution images every TR, using a second-order gradient field and an 8-channel receiver-array. The reconstructed images were then used to track translational and rotational rigid in-slice motion, with sub-pixel precision. Limited to the same field strength inside the field-of-view as the linear gradient fields typically available clinically, the motion navigator lasts only 500 us, including rewinding.

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