公开(公告)号：US10107884B2

公开(公告)日：2018-10-23

申请号：US14774187

申请日：2014-03-12

申请人： KONINKLIJKE PHILIPS N.V. ,  PHILIPS GMBH

发明人： Peter Boernert ,  Michel Paul Jurriaan Jurrissen ,  Mariya Ivanova Doneva ,  Adrianus Joseph Willibrordus Duijndam ,  Kay Nehrke

IPC分类号： G01V3/00 ,  G01R33/561 ,  G01R33/34 ,  G01R33/56

摘要： A parallel magnetic resonance imaging system (1) includes at least one radio frequency (RF) coil (10, 12) with a plurality of coil elements, a smart select unit (24), a parallel imaging parameter unit (28), and a sequence control (16). The smart select unit (24), from a pre-scan or prior scan of a subject with the at least one RF coil, constructs (60) a signal map and a plurality of noise maps based on different sets of reduction factors. The parallel imaging parameter unit (28) selects a set of reduction factors corresponding to a noise map which includes a highest signal-to-noise ratio (SNR). The sequence control (16) performs a magnetic resonance imaging scan of the subject based on the selected reduction factors.

公开(公告)号：US20200088822A1

公开(公告)日：2020-03-19

申请号：US16618959

申请日：2018-06-08

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Michel Paul Jurriaan Jurrissen ,  Arthur Filipe Nisti Grigoletto Borgonovi ,  Thomas Hendrik Rozijn

IPC分类号： G01R33/483 ,  G01R33/561 ,  G01R33/565

摘要： The invention relates to a method of MR imaging of an object (10) placed in an examination volume of a MR device (1). The method comprises the steps of: —generating MR signals by subjecting the object (10) to a number N of shots of a multi-echo imaging sequence comprising multi-slice RF pulses (21) for simultaneously exciting two or more spatially separate image slices, with a phase offset in the slice direction being imparted to the MR signals, wherein the phase offset is varied from shot to shot, —acquiring the MR signals, wherein the MR signals are received in parallel via a set of at least two RF coils (11, 12, 13) having different spatial sensitivity profiles within the examination volume, and—reconstructing a MR image for each image slice from the acquired MR signals using a parallel reconstruction algorithm, wherein the MR signal contributions from the different image slices are separated on the basis of the spatial encodings of the MR signals according to the spatial sensitivity profiles of the RF coils (11, 12, 13) and on the basis of the phase offsets attributed to the respective image slices and shots. Moreover, the invention relates to a MR device for carrying out this method as well as to a computer program to be run on a MR device.

公开(公告)号：US11112475B2

公开(公告)日：2021-09-07

申请号：US16618959

申请日：2018-06-08

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Michel Paul Jurriaan Jurrissen ,  Arthur Filipe Nisti Grigoletto Borgonovi ,  Thomas Hendrik Rozijn

IPC分类号： G01R33/483 ,  G01R33/561 ,  G01R33/565

摘要： A method of magnetic resonance (MR) imaging of an object includes: generating MR signals by subjecting the object to a number N of shots of a multi-echo imaging sequence comprising multi-slice RF pulses for simultaneously exciting two or more spatially separate image slices, with a phase offset in the slice direction being imparted to the MR signals; acquiring the MR signals that are received in parallel via a set of at least two RF coils having different spatial sensitivity profiles; and reconstructing a MR image for each image slice from the acquired MR signals using a parallel reconstruction algorithm, wherein the MR signal contributions from the different image slices are separated on the basis of the spatial encodings of the MR signals according to the spatial sensitivity profiles of the RF coils and of the phase offsets attributed to the respective image slices and shots.

公开(公告)号：US10241184B2

公开(公告)日：2019-03-26

申请号：US15128131

申请日：2015-03-20

申请人： KONINKLIJKE PHILIPS N.V.

发明人： Michel Paul Jurriaan Jurrissen ,  Johannes Petrus Groen ,  Miha Fuderer

IPC分类号： G01R1/00 ,  G01R33/565 ,  G01R33/561 ,  G01R33/48 ,  G01R33/58 ,  A61K6/00

摘要： In an EPI acquisition sequence for magnetic resonance signals k-space is scanned along sets of lines in k-space along opposite propagation directions, e.g. odd and even lines in k-space. Phase errors that occur due to the opposite propagation directions are corrected for in a SENSE-type parallel imaging reconstruction. The phase error distribution in image space may be initially estimated, calculated form the phase difference between images reconstructed from magnetic resonance signals acquired from the respective sets of k-space lines, or from an earlier dynamic.

公开(公告)号：US10203394B2

公开(公告)日：2019-02-12

申请号：US14762591

申请日：2014-01-06

申请人： PHILIPS GMBH

发明人： Michel Paul Jurriaan Jurrissen ,  Johan Michiel Den Harder ,  Ulrike Andrea Blume ,  Elwin De Weerdt ,  Gerrit Hendrik Van Ijperen

IPC分类号： G01R33/565 ,  G01R33/44 ,  G01R33/28 ,  G01R33/561

摘要： The invention relates to a method of MR imaging near metal parts using SEMAC. It is an object of the invention to provide an improved MR imaging technique that is sufficiently fast and robust against susceptibility effects. The invention proposes to apply a weaker slice-selection magnetic field gradient (Gslice) for reduction of ripple-artefacts near metal parts or to apply undersampling in the slice-selection direction of the SEMAC sequence or to apply both these aspects. According to one aspect of the invention, a sparsity constraint is used to make the reconstruction of the undersampled MR images more stable. Moreover, the invention relates to a MR device (1) and to a computer program to be run on a MR device (1).