title: Combined prospective and retrospective motion correction to relax navigator requirements.
abstract: Prospective motion correction can prevent motion artifacts in magnetic resonance imaging of the brain. However, for high-resolution imaging, the technique relies on precise tracking of head motion. This precision is often limited by tracking noise, which leads to residual errors in the prospectively-corrected k-space data and artifacts in the image. This work shows that it is possible to estimate these tracking errors, and hence the true k-space sample locations, by applying a two-sided filter to the tracking data after imaging. A conjugate gradient reconstruction is compared to gridding as a means of using this information to retrospectively correct for the effects of the residual errors.
authors: Department of Radiology, Medical Physics, University Medical Center, Freiburg, Freiburg, Germany. julian.maclaren@uniklinik-freiburg.de
authors: Julian
authors: J
authors: Maclaren
authors: Kuan J
authors: KJ
authors: Lee
authors: Chaiya
authors: C
authors: Luengviriya
authors: Oliver
authors: O
authors: Speck
authors: Maxim
authors: M
authors: Zaitsev