公开(公告)号：US11255938B2

公开(公告)日：2022-02-22

申请号：US15517998

申请日：2015-10-13

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Feng Huang ,  Zhigang Wu

IPC: G01R33/483 ,  G01R33/561 ,  G01R33/565 ,  A61B5/00 ,  G01R33/48 ,  G01R33/563 ,  A61B5/055

Abstract: The present invention provides a magnetic resonance imaging system for imaging a subject by a multi-shot imaging. The magnetic resonance imaging system comprises an acquiring unit for acquiring MR raw data corresponding to a plurality of shots; an imaging unit for generating a plurality of folded images from the MR raw data, wherein each of the plurality of folded images is generated from a subset of the MR raw data; a deriving unit for deriving magnitude of each pixel of each folded image; a detecting unit for detecting a motion of the subject during the multi-shot imaging based on similarity measurements of any two folded images of the plurality of folded images, wherein the detecting unit further comprises a first deriving unit configured to derive the measured similarities; and a reconstructing unit for reconstructing a MR image of the subject based on MR raw data obtained according to a detection result of the detecting unit. Since the partially acquired MR raw data is used for motion detection directly, it would be more rapid and stable.

公开(公告)号：US10746832B2

公开(公告)日：2020-08-18

申请号：US16064665

申请日：2016-12-15

Applicant: KONINKLIJKE PHILIPS N.V.

Inventor： Feng Huang ,  Zhigang Wu ,  Zhongbiao Wu

IPC: G01R33/563 ,  G01R33/565 ,  A61B5/055 ,  G01R33/561 ,  G06T7/20

Abstract: A method and apparatus for magnetic resonance (MR) diffusion tensor imaging (DTI) with minimizes artifacts caused by motion-induced changes of the diffusion encoding. An object (10) is subject to at least one shot of a multi-echo imaging sequence to generate a train of echo signals. The multi-echo imaging sequence includes diffusion gradients, acquiring the echo signals for different diffusion gradients, detecting motion of the object (10) during acquisition of the echo signals, determining a plurality of motional states of the object (10) based on the detected motion, wherein the object (10) is stationary in each detected motional state, determining directions of the diffusion gradients relative to a reference frame of the object (10) for detected motional states of the object (10), respectively, and deriving diffusion coefficients from the acquired echo signals for the determined relative directions of the diffusion gradients.