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MR imaging using a multi-point dixon technique

一种图像、图像分辨率的技术，应用在计算机程序领域，能够解决没有实现B0均匀性等问题

Active Publication Date: 2013-07-31
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For this reason, in all cases, the optimal B 0 Uniformity

Method used

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  • MR imaging using a multi-point dixon technique
  • MR imaging using a multi-point dixon technique
  • MR imaging using a multi-point dixon technique

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Embodiment Construction

[0048] refer to figure 1 , shows the MR device 1 . The device comprises a superconducting or resistive main magnet coil 2 such that a substantially uniform, temporally constant main magnetic field B is produced along the z-axis through the examination volume 0 . The device also includes a set of (first, second and - where applicable - third) shim coils 2', wherein, in order to minimize B in the examination volume 0 Deviation, the current flowing through each shim coil in the set of shim coils 2' is controllable.

[0049] The magnetoresistance generation and manipulation system applies a series of RF pulses and switched (switched) magnetic field gradients to invert or excite nuclear magnetic spins, induce magnetic resonance, refocus magnetic resonance, manipulate magnetic resonance, control magnetic resonance, saturate The spins etc. are spatially or otherwise encoded to perform MR imaging.

[0050] Very specifically, the gradient pulse amplifier 3 applies current pulses to...

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Abstract

The invention relates to a method of MR imaging of at least a portion of a body (10) of a patient positioned in an examination volume of a MR device (1). It is an object of the invention to provide a method that enables improved fat saturation. The method of the invention comprises the steps of: - subjecting the portion of the body (10) to a calibration sequence comprising RF pulses and switched magnetic field gradients controlled in such a manner that a calibration signal data set is acquired by means of a multi-point Dixon technique at a first image resolution; - deriving calibration parameters from the calibration signal data set; - controlling the MR device (1) according to the derived calibration parameters; - subjecting the portion of the body (10) to an imaging sequence comprising RF pulses and switched magnetic field gradients controlled in such a manner that a diagnostic signal data set is acquired at a second image resolution which is higher than the first image resolution; and - reconstructing a diagnostic MR image from the diagnostic signal data set. Moreover, the invention relates to a MR device (1) for carrying out the method and to a computer program to be run on a MR device (1).

Description

technical field [0001] The present invention relates to the field of magnetic resonance (MR) imaging. It relates to a method for MR imaging of at least a part of a patient's body positioned in an examination volume of an MR system. The invention also relates to an MR device and a computer program to be run on the MR device. Background technique [0002] Image-forming MR methods that exploit the interaction between magnetic fields and nuclear spins to form two- or three-dimensional images are widely used today, especially in the field of medical diagnosis, because they are superior in many ways to imaging soft tissues method, does not require ionizing radiation and is usually noninvasive. [0003] According to the usual MR method, the body of the patient to be examined is arranged in a strong homogeneous magnetic field B 0 In , the direction of this magnetic field simultaneously defines the axis (usually the z-axis) of the coordinate system on which the measurements are ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54G01R33/565G01R33/58G01R33/48
CPCG01R33/583G01R33/385G01R33/4828G01R33/3875G01R33/543G01R33/56527
Inventor A·W·西蒙内蒂G·H·海里戈P·博尔纳特
Owner KONINK PHILIPS ELECTRONICS NV
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