MRI WITH MOTION CORRECTION USING NAVIGATORS ACQUIRED USING A DIXON TECHNIQUE

摘要

The invention relates to a method of MR imaging of at least a portion of a body (10) placed in a main magnetic field Bo within the examination volume of a MR device. It is an object of the invention to enable MR imaging with reliable motion detection and high image quality. The method of the invention comprises the following steps: subjecting the portion of the body (10) to an imaging sequence comprising one or more RF pulses and switched magnetic field gradients for acquiring imaging signals; subjecting the portion of the body (10) to a navigator sequence applied at least once before, during, or after the imaging sequence, the navigator sequence comprising one or more RF pulses and switched magnetic field gradients controlled in such a manner that navigator signals are acquired by means of a single-point or multi-point Dixon technique; deriving translation and/or rotation and/or shear data from the navigator signals, which translation and/or rotation and/or shear data reflect motion occurring within the body (10) during the acquisition of the imaging signals; reconstructing a MR image from the imaging signals, wherein the translation and/or rotation and/or shear data are used for adapting the imaging sequence and/or for motion correction during reconstruction of the MR image. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).

主权项

1. Method of MR imaging of at least a portion of a body placed in a main magnetic field B0 within the examination volume of a MR device, the method comprising the following steps:
subjecting the portion of the body to an imaging sequence comprising one or more RF pulses and switched magnetic field gradients for acquiring imaging signals; subjecting the portion of the body to a navigator sequence applied at least once before, during, or after the imaging sequence, the navigator sequence comprising one or more RF pulses and switched magnetic field gradients controlled in such a manner that navigator signals are acquired by means of a single-point or multi-point Dixon technique and the navigator signals are formed as separate water and fat signals; deriving translation and/or rotation and/or shear data from the navigator signals, which translation and/or rotation and/or shear data reflect motion occurring within the body; reconstructing a MR image from the imaging signals, wherein the translation and/or rotation and/or shear data are used for adapting the imaging sequence and/or for motion correction during reconstruction of the MR image.