Method And Test Apparatus For Determining A Deviation In Homogeneity Of A Magnetic Field Of A Magnetic Resonance Scanner

A technology of magnetic resonance equipment and uniformity, applied in the fields of application, measurement of magnetic variables, medical science, etc., can solve problems such as MR signal errors and lack of image data, and achieve the effect of improving uniformity

Inactive Publication Date: 2017-10-03
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the main magnetic field and / or the magnetic field gradient have local deviations, so that the image data may have no MR signal or wrong MR signal at certain positions

Method used

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  • Method And Test Apparatus For Determining A Deviation In Homogeneity Of A Magnetic Field Of A Magnetic Resonance Scanner
  • Method And Test Apparatus For Determining A Deviation In Homogeneity Of A Magnetic Field Of A Magnetic Resonance Scanner
  • Method And Test Apparatus For Determining A Deviation In Homogeneity Of A Magnetic Field Of A Magnetic Resonance Scanner

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Embodiment Construction

[0047] figure 1 A schematic diagram of a magnetic resonance system 11 with a detection device 15 according to the invention for use in the method according to the invention is shown. In the embodiment shown, the testing device 15 comprises two testing containers 40 . Here, the number of detection containers 40 is not limited to two. The detection device 15 can also comprise further detection containers. The magnetic resonance system 11 includes a detection unit formed by a magnetic unit 13 having a main magnet 17 for generating a strong and in particular constant main magnetic field 18 . The main magnetic field 18 is directed in a first direction parallel to the first axis. Furthermore, the magnetic resonance system 11 has a cylindrical patient receiving area 14 for receiving an examination object, wherein the patient receiving area 14 is cylindrically surrounded by the magnetic unit 13 in the circumferential direction. The detection device 15 according to the invention ca...

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Abstract

In a method and test apparatus for determining a deviation in the homogeneity of a basic magnetic field of a magnetic resonance scanner, test vessels are positioned in a test plane that first and second positions along a direction in the scanner, and measurement data are acquired with the test vessels at said respective positions. The acquired measurement data are provided to a processor, wherein a deviation of the homogeneity of the basic magnetic field is determined based thereon.

Description

technical field [0001] The invention relates to a method for determining deviations from the homogeneity of a magnetic field of a magnetic resonance system in a first direction defined by a first axis and to a detection device used in the aforementioned method. Background technique [0002] In magnetic resonance systems, the examination object to be examined, for example a patient, is usually placed in a relatively large main magnetic field, for example 1.5 or 3 Tesla, by means of a main magnet. Furthermore, at least one magnetic field gradient is realized by means of the gradient coil unit. The high-frequency excitation signal (HF signal) is then transmitted via the high-frequency antenna unit by means of a suitable antenna arrangement, which results in determining the nuclear spins of the atoms excited by the high-frequency field resonance with defined relative to the magnetic field lines of the high-frequency field. Flip Angle Flip. When the nuclear spins finally preces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/58G01R33/565G01R33/3873
CPCG01R33/3873G01R33/565G01R33/58A61B5/055G01R33/243G01R33/246G01R33/56383G01R33/387
Inventor S.比伯
Owner SIEMENS HEALTHCARE GMBH
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