Patent ID: 8975895
Filing Date: 2015-03-10
Classification: G01R

Abstract:
1. A method for correcting motion-induced phase errors in diffusion-weighted k-space data acquired with a magnetic resonance imaging (MRI) system, the steps of the method comprising: a) directing the MRI system to: b) calculating k-space shift values and a constant phase offset value using the three-dimensional diffusion-weighted navigator data acquired in step a)ii) and the three-dimensional non-diffusion-weighted navigator data acquired in step a)iv); c) updating the k-space shift values and the constant phase offset value calculated in step b) by iteratively minimizing a cost function that relates a phase of the diffusion-weighted k-space data acquired in step a)i) to a phase of the non-diffusion-weighted k-space data acquired in step a)iii) as shifted by the k-space shift values and constant phase offset value calculated in step b); and d) correcting the diffusion-weighted k-space data acquired in step a)i) for motion-induced phase errors using the k-space shift values and constant phase offset value updated in step c).