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Magnetic resonance apparatus

A magnetic resonance equipment and regional technology, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement of magnetic variables, etc., can solve problems such as prolonging scanning time and increasing specific absorption rate

Active Publication Date: 2017-09-01
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, MT pulses have a large flip angle (eg, 900 degrees), which poses a problem of increased SAR when imaging a subject
Accordingly, when using MT pulses to execute a 3D TOF-MRA pulse sequence, it is necessary to extend the repetition time TR so that the upper limit of the specific absorption rate SAR is not exceeded, thereby causing the problem of prolonging the scan time required for executing the pulse sequence

Method used

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  • Magnetic resonance apparatus
  • Magnetic resonance apparatus
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Embodiment Construction

[0033] Hereinafter, embodiments for implementing the present invention will be described, although the present invention is not limited thereto.

[0034] figure 1 It is a schematic diagram of a magnetic resonance device in an embodiment of the present invention.

[0035] The magnetic resonance device (hereinafter referred to as “MR device”) 100 includes a magnet 2, a stage 3, and an RF receiving coil (hereinafter referred to as “receiving coil”) 4.

[0036] The magnet 2 has a bore 21, and the subject 13 is inserted through the bore. The magnet 2 includes a superconducting coil for generating a static magnetic field, a gradient coil for applying a gradient magnetic field, and an RF coil for applying RF pulses. Permanent magnets can be used instead of superconducting coils.

[0037] The stand 3 has a bracket 3a. The bracket 3a is configured to be movable into the bore 21. The subject 13 is transported into the bore 21 by the carriage 3a.

[0038] The receiving coil 4 is attached to th...

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Abstract

An MR apparatus 100 comprises scanning unit for performing a pulse sequence PS including an MT pulse b for lessening signals from the cerebral parenchyma (white matter and gray matter). The scanning unit performs the pulse sequence PS in periods of time P1 and P3 in the pulse sequence PS so that the MT pulse b is applied every repetition time TR, while it performs the pulse sequence PS in a period of time P2 in the pulse sequence PS so that no MT pulse b is applied.

Description

[0001] Cross references to related applications [0002] This application claims the priority of Japanese Patent Application No. 2014-262969 filed on December 25, 2015, which is fully incorporated herein by reference. Background technique [0003] The present invention relates to a magnetic resonance device that performs a pulse sequence including RF pulses, which are used to cause the transfer of magnetization. [0004] Known techniques for presenting blood in the head and neck include a method that includes setting a slab in the head and neck, and using 3D time-of-flight MR angiography (TOF) -MRA) Get data from the board. In the 3DTOF-MRA method, the inflow effect caused by blood flowing into the plate from an area outside the plate makes it possible to present the blood flowing in the plate. [0005] However, the board not only contains blood as the object to be presented, but also contains various background tissues that are not the object to be presented. Therefore, it is neces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/28G01R33/48G01R33/483G01R33/56
CPCG01R33/288G01R33/4818G01R33/4838G01R33/5605G01R33/482G01R33/4824G01R33/543G01R33/5607G01R33/5635G01R33/561
Inventor M.米尤施N.塔凯
Owner GENERAL ELECTRIC CO