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Method for determining magnetic resonance data

A technology of magnetic resonance data and magnetic resonance equipment, which is applied in magnetic resonance measurement, measurement using nuclear magnetic resonance imaging system, measurement of magnetic variables, etc., and can solve problems such as uncorrectable and uncompensable

Inactive Publication Date: 2012-09-19
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the case of strong distortions in the marginal region, subsequent compensation of the distortions in the magnetic resonance image is generally not possible, since in the magnetic resonance image the distorted regions overlap and thus cannot be corrected afterwards

Method used

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  • Method for determining magnetic resonance data
  • Method for determining magnetic resonance data
  • Method for determining magnetic resonance data

Examples

Experimental program
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Embodiment Construction

[0030] figure 1 A schematic diagram of a magnetic resonance system 1 is shown. The magnetic resonance system 1 includes its own tomography system 1 , an examination table 3 for a patient 4 in an opening 5 of the tomography system 2 , a control unit 6 , an evaluation device 7 and a drive unit 8 . The control unit 6 controls the tomograph 2 and receives signals recorded by the tomograph 2 from the tomograph 2 . In order to generate the basic magnetic field B 0 , the tomograph 2 includes a basic field magnet, not shown, and to generate the gradient magnetic field, the tomograph 2 includes a gradient field system, not shown. Furthermore, the tomography system 2 includes one or more high-frequency antennas for generating high-frequency signals and for receiving measurement signals which are used by the control device 6 and the evaluation device 7 to generate magnetic resonance images. Furthermore, the control device 6 controls the drive unit 8 in order to move the examination co...

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Abstract

The present invention relates to a method for determining magnetic resonance data of an examination object in a magnetic resonance facility (1). According to an embodiment of the method, a first readout gradient field (205) is determined in such a way that a distortion caused by a non-linearity of the first readout gradient field (205) and a distortion caused by a B0 field inhomogeneity are essentially cancelled at a first location (41) of a field of view (9, 10) of the magnetic resonance facility (1). Moreover, a second readout gradient field (209) is determined in such a way that a distortion caused by a non-linearity of the second readout gradient field (209) and a distortion caused by a B0 field inhomogeneity are essentially cancelled at a different second location (43) of the field of view (9, 10). Finally, a multiecho sequence is performed, wherein first magnetic resonance data (206) is captured using the first readout gradient field (205) after a 180 DEG pulse (204) and second magnetic resonance data (210) is captured using the second readout gradient field (209) after a further 180 DEG pulse (208).

Description

technical field [0001] The invention relates to a method for determining magnetic resonance data of an examination object in a magnetic resonance system and to a magnetic resonance system used for the method. Background technique [0002] In a magnetic resonance system, the volume within the tomography system that can be used for recording magnetic resonance tomography images is limited in all three spatial directions due to physical and technical conditions such as limited magnetic field homogeneity and inhomogeneity of the gradient field. is limited. The usable acquisition space, the so-called field of view or field of view (FoV), is therefore limited in which the above-mentioned physical properties lie within predetermined tolerances and can therefore be faithfully performed with conventional magnetic resonance measurement sequences on the object to be examined. The imaging space of the original. The limited field of view or field of view, in particular in the x and y d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/54G01R33/565G01R33/34A61B5/055
CPCG01R33/56563G01R33/481G01R33/56572
Inventor J.O.布卢姆哈根M.芬彻尔R.雷德贝克
Owner SIEMENS HEALTHCARE GMBH