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    Magnetic resonance fingerprinting dictionary generation using a supplementary magnetic field coil
    11.
    发明授权
    Magnetic resonance fingerprinting dictionary generation using a supplementary magnetic field coil 有权

    公开(公告)号：US10509086B2

    公开(公告)日：2019-12-17

    申请号：US15735422

    申请日：2016-06-08

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Thomas Erik Amthor ,  Peter Boernert ,  Mariya Ivanova Doneva ,  Wim Crooijmans

    IPC: G01R33/46 ,  G01R33/30 ,  G01R33/31 ,  G01R33/3875 ,  G01R33/389 ,  G01R33/36 ,  G01R33/465 ,  G01R33/48

    Abstract: The invention provides for a method of operating an instrument (100). The instrument comprises a magnetic resonance system (102) for measuring dictionary magnetic resonance data (154) from a measurement zone (108). The magnetic resonance system comprises a magnet (104) for generating a main magnetic field within the measurement zone. The magnetic resonance system comprises a test fixture (124) for holding a test sample (132) within the measurement zone. The test fixture comprises a supplementary magnetic field coil (126) and a magnetic resonance antenna (128). The method comprises the steps of repeatedly: choosing (200) an electrical current; supplying (202) the electrical current to the supplementary magnetic field coil to adjust the main magnetic field within the measurement zone; acquiring (204) the dictionary magnetic resonance data from the test sample with the magnetic resonance antenna by controlling the magnetic resonance system according to a magnetic resonance fingerprinting technique; and appending (206) the dictionary magnetic resonance data to a magnetic resonance fingerprinting dictionary (156).

    RF amplifier control in parallel RF transmission based on power requirements
    13.
    发明授权
    RF amplifier control in parallel RF transmission based on power requirements 有权

    公开(公告)号：US10114090B2

    公开(公告)日：2018-10-30

    申请号：US14434047

    申请日：2013-10-01

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Ulrich Katscher ,  Hanno Heyke Homann ,  Peter Boernert

    IPC: G01V3/00 ,  G01R33/48 ,  G01R33/36 ,  G01R33/483 ,  G01R33/561 ,  G01R33/565 ,  H03F3/19 ,  G01R33/58

    Abstract: A magnetic resonance imaging system acquires magnetic resonance data from a target volume in a subject. The magnetic resonance imaging system includes multiple excitation sources for generating a slice-selective or slab-selective spatial radio frequency (RF) excitation magnetic field targeting slice/slab spatial variations in the target volume, and a controller coupled to the excitation sources. The controller is adapted for: determining a power level required by the excitation sources for generating the slice-selective/or slab-selective spatial RF excitation magnetic field, decomposing the slice-selective or slab-selective spatial RF excitation magnetic field into respective RF excitation constituents of the excitation sources, controlling each of the excitation sources to simultaneously generate the respective RF excitation constituent, using the determined power level for acquiring the magnetic resonance data.

    Metal resistant MR imaging reference scan
    14.
    发明授权
    Metal resistant MR imaging reference scan 有权

    公开(公告)号：US09977108B2

    公开(公告)日：2018-05-22

    申请号：US14432931

    申请日：2013-09-11

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Kay Nehrke ,  Peter Boernert ,  Johan Michiel Den Harder ,  Thomas Hendrik Rozijn

    IPC: G01R33/20 ,  G01R33/561 ,  G01R33/24 ,  A61B5/055 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

    CPC classification number: G01R33/5611 ,  A61B5/055 ,  G01R33/246 ,  G01R33/34 ,  G01R33/36 ,  G01R33/385

    Abstract: The invention relates to a method of parallel MR imaging, wherein a reference scan is performed by means of a stimulated echo sequence including i) at least two preparation RF pulses (α) radiated toward a portion of a body (10) during a preparation period (21), and ii) one or more reading RF pulses (β) radiated toward the portion of the body (10) during an acquisition period (22) temporally subsequent to the preparation period (21). One or more FID signals (I1) and one or more stimulated echo signals (I2) are acquired during the acquisition period (22). The spatial receive and/or—if applicable—transmit4 sensitivity profiles of at least two RF coils (11, 12, 13) are derived from the acquired FID signals (I1) and/or from the acquired stimulated echo signals (I2). The parameters of the stimulated echo sequence are selected such that it is robust against susceptibility-induced artifacts. Moreover, 10 the invention relates to a MR device (1) and to a computer program for a MR device (1).

    SPATIALLY CORRECTED NUCLEAR IMAGE RECONSTRUCTION
    15.
    发明申请
    SPATIALLY CORRECTED NUCLEAR IMAGE RECONSTRUCTION 有权
    空间校正核图像重构

    公开(公告)号：US20150003709A1

    公开(公告)日：2015-01-01

    申请号：US14376863

    申请日：2013-02-15

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Peter Boernert ,  Steffen Renisch ,  Susanne Heinzer

    IPC: G06T11/00 ,  A61B6/03 ,  A61B6/00 ,  A61B5/055

    CPC classification number: G06T11/005 ,  A61B5/055 ,  A61B6/032 ,  A61B6/037 ,  A61B6/463 ,  A61B6/466 ,  A61B6/5205 ,  A61B6/5247 ,  A61B6/563 ,  G06T11/006

    Abstract: A medical imaging system (5) includes one or more processors and a display device (36). The one or more processors are programmed to receive (60) a first image (10) contrasting regions of tissue with a distinct radiotracer accumulation probability and generate (64) a constraint map (20) based on the regions of tissue with the distinct radiotracer accumulation probability. The one or more processors are programmed to reconstruct (70) a second image (44) with redistribution of a measured radiotracer based on the constraint map (20) and acquired image raw data (23) registered to the constraint map. The display device (36) displays the reconstructed second image.

    Abstract translation: 医疗成像系统（5）包括一个或多个处理器和显示装置（36）。 所述一个或多个处理器被编程为接收具有不同放射性示踪剂累积概率的（60）对比区域的第一图像（10），并基于具有不同放射性示踪剂累积的组织区域生成（64）约束图（20） 可能性。 一个或多个处理器被编程为基于约束映射（20）和已注册到约束映射的所获取的图像原始数据（23）来重建（70）具有测量的放射性示踪器的再分配的第二图像（44）。 显示装置（36）显示重建的第二图像。

    Determination of higher order terms of the three-dimensional gradient impulse response function
    16.
    发明授权
    Determination of higher order terms of the three-dimensional gradient impulse response function 有权

    公开(公告)号：US10890638B2

    公开(公告)日：2021-01-12

    申请号：US16391457

    申请日：2019-04-23

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Juergen Rahmer ,  Tim Nielsen ,  Peter Boernert

    IPC: G01R33/385 ,  A61B5/055 ,  G01R33/44 ,  G01R33/48 ,  G01R33/483 ,  G01R33/561 ,  G01R33/58

    Abstract: A medical instrument includes a magnetic resonance (MR) imaging system with an imaging zone and a gradient coil system with three orthogonal gradient coils.
    A processor controls the medical instrument to: repeatedly control the MR imaging system with calibration pulse sequence commands to acquire the MR calibration data for multiples slices using at least one of the three orthogonal gradient coils to generate the slice select gradient magnetic field; compute a Fourier transform of the MR calibration data for each of the voxels of the multiple slices in the phase encoding directions; compute an expansion of the Fourier transformed MR calibration data into spherical harmonics; and calculate a three-dimensional gradient impulse response function for the at least one of the three orthogonal gradient coils using the expansion into spherical harmonics. The calibration pulse sequence commands are configured to acquire MR calibration data from a phantom according to a calibration protocol with two-dimensional phase encoding perpendicular to a slice select gradient magnetic field.

    MR imaging with B1 mapping
    17.
    发明授权
    MR imaging with B1 mapping 有权

    公开(公告)号：US10156625B2

    公开(公告)日：2018-12-18

    申请号：US14455165

    申请日：2014-08-08

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Kay Nehrke ,  Peter Boernert

    IPC: G01R33/565 ,  G01R33/24 ,  G01R33/561 ,  A61B5/055 ,  A61B5/026

    Abstract: A method of MR imaging, wherein a portion of a body placed in the examination volume of a MR device is subjected to an imaging sequence of RF pulses and switched magnetic field gradients. The imaging sequence is a stimulated echo sequence including i) at least two preparation RF pulses (α) radiated toward the portion of the body during a preparation period, and ii) one or more reading RF pulses (β) radiated toward the portion of the body during an acquisition period temporally subsequent to the preparation period. One or more FID signals and one or more stimulated echo signals are acquired during the acquisition period. A B1 map indicating the spatial distribution of the RF field of the RF pulses within the portion of the body is derived from the acquired FID and stimulated echo signals.

    MR imaging with B1 mapping
    19.
    发明授权
    MR imaging with B1 mapping 有权

    公开(公告)号：US09977106B2

    公开(公告)日：2018-05-22

    申请号：US14371887

    申请日：2013-01-04

    Applicant: KONINKLIJKE PHILIPS N.V.

    Inventor： Kay Nehrke ,  Peter Boernert ,  Ingmar Graesslin ,  Ulrich Katscher ,  Christoph Leussler ,  Holger Eggers

    IPC: G01R33/50 ,  G01R33/24 ,  G01R33/54

    CPC classification number: G01R33/50 ,  G01R33/243 ,  G01R33/246 ,  G01R33/54

    Abstract: In an MR imaging method and apparatus, a portion of a body placed in an examination volume of an MR device is subjected to an imaging sequence of RF pulses and switched magnetic field gradients. The imaging sequence is a stimulated echo sequence including i) two preparation RF pulses (α) radiated toward the portion of the body during a preparation period (21), and ii) reading RF pulses (β) radiated toward the portion of the body during an acquisition period (22) temporally subsequent to the preparation period (21). FID signals (I1) and stimulated echo signals (I2) are acquired during the acquisition period (22) with equal T2*-weighting. A B1 map indicating a spatial distribution of the RF field of the preparation RF pulses within the portion of the body is derived from the acquired FID (I1) and stimulated echo (I2) signals.

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