公开(公告)号：US20240268701A1

公开(公告)日：2024-08-15

申请号：US18642740

申请日：2024-04-22

Applicant: SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.

Inventor： Jingyuan LYU ,  Qi LIU ,  Zhongqi ZHANG ,  Jian XU

IPC: A61B5/055 ,  A61B6/00 ,  A61B6/03 ,  G01R33/24 ,  G01R33/46 ,  G01R33/48 ,  G01R33/483 ,  G01R33/561 ,  G01R33/563 ,  G01R33/565 ,  G06T3/16 ,  G06T7/00 ,  G06T7/215 ,  G06T7/262 ,  G06T7/269 ,  G06T9/00 ,  G06T11/00

CPC classification number: A61B5/055 ,  G01R33/4616 ,  G01R33/4818 ,  G01R33/561 ,  G01R33/56316 ,  G01R33/56563 ,  G01R33/5659 ,  G06T7/0016 ,  G06T9/008 ,  G06T11/003 ,  G06T11/005 ,  G06T11/008 ,  A61B6/032 ,  A61B6/5205 ,  G01R33/243 ,  G01R33/4833 ,  G01R33/5611 ,  G01R33/5617 ,  G01R33/5618 ,  G01R33/5619 ,  G01R33/56341 ,  G06T3/16 ,  G06T7/0012 ,  G06T7/215 ,  G06T7/262 ,  G06T7/269 ,  G06T2207/10072 ,  G06T2207/10084 ,  G06T2207/10088 ,  G06T2207/10092 ,  G06T2207/10096 ,  G06T2207/10104 ,  G06T2207/10108 ,  G06T2207/10132 ,  G06T2207/10136 ,  G06T2207/20182 ,  G06T2207/30004 ,  G06T2207/30048 ,  G06T2210/41 ,  G06T2210/52 ,  G06T2211/40 ,  G06T2211/416

Abstract: An imaging method may include obtaining imaging data associated with a region of interest (ROI) of an object. The imaging data may correspond to a plurality of time-series images of the ROI. The imaging method may also include determining, based on the imaging data, a data set including a spatial basis and one or more temporal bases. The spatial basis may include spatial information of the imaging data. The one or more temporal bases may include temporal information of the imaging data. The imaging method may also include storing, in a storage medium, the spatial basis and the one or more temporal bases.

公开(公告)号：US11841413B2

公开(公告)日：2023-12-12

申请号：US17758138

申请日：2020-12-30

Applicant: Case Western Reserve University ,  Vanderbilt University

Inventor： Mark A. Griswold ,  William A. Grissom

IPC: G01R33/565 ,  G01R33/483

CPC classification number: G01R33/56554 ,  G01R33/4831 ,  G01R33/4833

Abstract: The present application provides a system and method for using a nuclear magnetic resonance (NMR) system. The method includes performing a pulse sequence using the NMR system that spatially encodes NMR signal evolutions to be acquired from a subject using an aggregated radio-frequency (B1) field incoherence and resolving the NMR signal evolutions acquired from the subject using at least one of a dictionary of known magnetic resonance fingerprinting (MRF) signal evolutions to determine matches in the NMR signal evolutions to the known MRF signal evolutions or an optimization process. The method also includes generating at least two spatially-resolved measurements indicating quantitative tissue parameters of the subject in at least two locations.

公开(公告)号：US20180348322A1

公开(公告)日：2018-12-06

申请号：US16002467

申请日：2018-06-07

Applicant: Siemens Aktiengesellschaft

Inventor： Thorsten Feiweier

IPC: G01R33/483 ,  G01R33/50 ,  G01R33/561 ,  G01R33/56 ,  A61B5/055 ,  G01R33/54 ,  G01R33/565

CPC classification number: G01R33/4833 ,  A61B5/055 ,  G01R33/50 ,  G01R33/543 ,  G01R33/5602 ,  G01R33/5607 ,  G01R33/561 ,  G01R33/56527

Abstract: In a magnetic resonance measurement sequence, an inversion pulse is applied that acts on a longitudinal magnetization of a first spin species and a second spin species, for example on a water portion and a fat portion. An excitation pulse is applied after a predetermined time period. At least one manipulation pulse is subsequently applied, respectively with associated gradient pulse.

公开(公告)号：US20180335489A1

公开(公告)日：2018-11-22

申请号：US15598939

申请日：2017-05-18

Applicant: Synaptive Medical (Barbados) Inc.

Inventor： Jeff Alan Stainsby ,  Chad Tyler Harris ,  Andrew Thomas Curtis ,  Alexander Gyles Panther

IPC: G01R33/36 ,  G01R33/54 ,  G01R29/08 ,  G01R33/385 ,  G01R33/56 ,  G01R33/3875

CPC classification number: G01R33/3607 ,  G01R33/288 ,  G01R33/4833 ,  G01R33/583

Abstract: Methods for correcting a non-uniform power response of a radiofrequency (“RF”) transmit coil used in magnetic resonance imaging (“MRI”) are described. Transmit power response data for an RF transmit coil are processed to compute RF amplitude scaling factors for the RF transmit coil as a function of transmit frequency offset. The RF amplitude scaling factors can be used to correct transmitted RF power, and thus flip angle, to be more uniform over a range of transmit frequency offsets, as may be encountered when imaging with lower field MRI systems or MRI systems with high strength or asymmetric gradients.

公开(公告)号：US20180329004A1

公开(公告)日：2018-11-15

申请号：US15967793

申请日：2018-05-01

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Satoshi IMAI ,  Sadanori TOMIHA ,  Keiichiro ISHI ,  Takaya MORI

IPC: G01R33/36 ,  G01R33/483 ,  G01R33/54

CPC classification number: G01R33/3607 ,  G01R33/4833 ,  G01R33/543

Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a transmission coil and processing circuitry. The transmission coil is configured to apply a high frequency magnetic field to an object. The processing circuitry is configured to: derive, based on at least one of an imaging region and the body shape data of the object, a specific area in a field of view (FOV); and determine, based on a signal within the specific area, an output power level of a high frequency pulse signal supplied to the transmission coil.

公开(公告)号：US20180313925A1

公开(公告)日：2018-11-01

申请号：US16028768

申请日：2018-07-06

Applicant: BIOPROTONICS, LLC

Inventor： Ian Parker ,  David R. Chase ,  Timothy W. James ,  Kristin James

IPC: G01R33/56 ,  G01R33/48 ,  G01R33/483 ,  G01R33/561 ,  G01R33/563 ,  G06T7/00

CPC classification number: G01R33/5601 ,  A61B5/055 ,  G01R33/4818 ,  G01R33/4828 ,  G01R33/4833 ,  G01R33/4835 ,  G01R33/56 ,  G01R33/5602 ,  G01R33/5616 ,  G01R33/5619 ,  G01R33/56341 ,  G06T7/0012 ,  G06T2207/10088

Abstract: A method for identifying the chemical species of various textural elements in a targeted region of tissue wherein a volume of interest (VOI) is selectively excited and a k-encode gradient pulse is applied to induce phase wrap to create a spatial encode for a specific k-value and orientation. The specific k-value is selected based on anticipated texture within the VOI. Multiple sequential samples of the NMR RF signal encoded with the specific k-value are recorded as signal data. The Fourier Transform of the acquired signal data is then taken, wherein for each k-encode, the signal recorded is indicative of the spatial frequency power density at that point in k-space. Each peak in the NMR spectrum is then evaluated, whereby the relative contribution to the texture of tissue in the VOI at a k-value for each chemical species is determined.

公开(公告)号：US20180252788A1

公开(公告)日：2018-09-06

申请号：US15754273

申请日：2016-09-28

Applicant: COMMISSARIAT A L'ENERGIE ATOMIQUE ET AUX ENERGIES AL TERNATIVES

Inventor： Nicolas BOULANT ,  Vincent GRAS

IPC: G01R33/561 ,  G01R33/565 ,  G01R33/24 ,  G01R33/483 ,  G01R33/48

CPC classification number: G01R33/5612 ,  G01R33/246 ,  G01R33/4822 ,  G01R33/4833 ,  G01R33/5659

Abstract: A method of designing a pulse sequence for parallel-transmission magnetic resonance imaging comprises: a) acquiring, for each member of a cohort, inhomogeneity maps of radio-frequency fields generated within the member; b) computing, for each member of the cohort, a spatial distribution of flip angles of nuclear spins obtained using the pulse sequences, and c) computing a single cost or merit function representative of a difference between the spatial distributions of flip angles and a target distribution, and iteratively adjusting design parameters of the pulse sequences to optimize the cost or merit function; the steps b) and c) being carried out iteratively using a computer. A method of performing parallel-transmission magnetic resonance imaging on a subject using a pulse sequence designed by such a method is provided.

公开(公告)号：US20180217215A1

公开(公告)日：2018-08-02

申请号：US15881471

申请日：2018-01-26

Applicant: Siemens Healthcare GmbH

Inventor： Christoph Forman ,  Edgar Mueller ,  Michaela Schmidt ,  Jens Wetzl

IPC: G01R33/483 ,  G01R33/44 ,  G01R33/48 ,  G01R33/567 ,  G01R33/561

CPC classification number: G01R33/4833 ,  G01R33/288 ,  G01R33/445 ,  G01R33/482 ,  G01R33/4822 ,  G01R33/543 ,  G01R33/5608 ,  G01R33/5613 ,  G01R33/5614 ,  G01R33/56325 ,  G01R33/567

Abstract: In a method and magnetic resonance apparatus for recording diagnostic measurement data of a heart of an examination object, the magnetic resonance apparatus is operated by a control sequence wherein an RF pulse excites nuclear spins with a flip angle of at least 60°, the diagnostic measurement data are recorded in a coordinate system independent of the heart, and the basic magnetic field produced by the magnetic resonance apparatus is smaller than 1.0 tesla.

公开(公告)号：US09897676B2

公开(公告)日：2018-02-20

申请号：US14221614

申请日：2014-03-21

Applicant: Yu Qing Huang ,  Cong Zhao

Inventor： Yu Qing Huang ,  Cong Zhao

IPC: G01R33/483 ,  G01R33/563 ,  G01R33/561

CPC classification number: G01R33/4833 ,  G01R33/5616 ,  G01R33/56341

Abstract: In an RF excitation method and device for a magnetic resonance imaging system, the RF pulses are emitted in a STEAM sequence, the STEAM sequence including, in time order, a first 90-degree excitation pulse, a second 90-degree excitation pulse and a third 90-degree excitation pulse. Gradient pulses are activated that act in cooperation with the STEAM sequence, the gradient pulses including, in time order, a first gradient pulse, a second gradient pulse and a third gradient pulse. Each of the gradient pulses is activated simultaneously with the corresponding RF pulse. The direction of each of the gradient pulses is the vector sum of multiple gradient pulses in different directions, the directions of any two of the gradient pulses being the same and intersecting with the direction of another of the gradient pulses.

公开(公告)号：US20180003787A1

公开(公告)日：2018-01-04

申请号：US15196305

申请日：2016-06-29

Applicant: NEW YORK UNIVERSITY ,  SIEMENS HEALTHCARE GMBH

Inventor： MARTIJN CLOOS ,  LARS LAUER ,  DANIEL SODICKSON ,  GRAHAM WIGGINS

IPC: G01R33/483 ,  G01R33/34 ,  G01R33/36

CPC classification number: G01R33/4833 ,  G01R33/34076 ,  G01R33/341 ,  G01R33/3607 ,  G01R33/3873 ,  G01R33/3875 ,  G01R33/5612

Abstract: In a magnetic resonance (MR) apparatus and a method for operation thereof, the radio-frequency (RF) resonator of the scanner of the apparatus fed from a single RF source and is operated, during a total scan duration for acquiring MR scan data from a subject, so as to excite nuclear spins in the subject with respective RF fields having different B1+ field profiles that are radiated at respectively different times during the acquisition of the scan data. The scan data acquired during the scan thus are produced from MR signals caused by nuclear spins excited by at least two different B1+ field profiles. The scan can be used to acquire MR data for MR fingerprinting.