Work

Volumetric navigators for prospective motion correction and selective reacquisition in neuroanatomical MRI

Year: 2011

Type: article

Abstract: We introduce a novel method of prospectively compensating for subject motion in neuroanatomical imaging. Short three-dimensional echo-planar imaging volumetric navigators are embedded in a long three-dimensional sequence, and the resulting image volumes are registered to provide an estimate of the subject's location in the scanner at a cost of less than 500 ms, ~ 1% change in contrast, and ~3% change in intensity. This time fits well into the existing gaps in sequences routinely used for neuroimaging, thus giving a motion-corrected sequence with no extra time required. We also demonstrate motion-driven selective reacquisition of k-space to further compensate for subject motion. We perform multiple validation experiments to evaluate accuracy, navigator impact on tissue intensity/contrast, and the improvement in final output. The complete system operates without adding additional hardware to the scanner and requires no external calibration, making it suitable for high-throughput environments.

Source: Magnetic Resonance in Medicine

DOI: 10.1002/mrm.23228

Authors: M. Dylan Tisdall, Aaron T. Hess, Martin Reuter, Ernesta M. Meintjes, Bruce Fischl, André J. W. van der Kouwe