Distortion correction method, magnetic resonance apparatus, program product and data medium

A magnetic resonance equipment and magnetic resonance technology, applied in the field of inhomogeneous distortion, can solve problems such as interference, measurement time magnetic field distortion, etc., and achieve the effect of low overhead

Inactive Publication Date: 2013-04-03
SIEMENS AG
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the hitherto known methods either solve the problem of interfering objects with magnetic field distortions in a restricted form or require such long measurement times that they are unacceptable in clinical practice.

Method used

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  • Distortion correction method, magnetic resonance apparatus, program product and data medium
  • Distortion correction method, magnetic resonance apparatus, program product and data medium
  • Distortion correction method, magnetic resonance apparatus, program product and data medium

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Embodiment Construction

[0049] Figure 7 A schematic diagram of a magnetic resonance system 5 (of a magnetic resonance imaging or nuclear spin tomography system) is shown. In this case, the basic field magnet 1 generates a time-constant strong magnetic field for polarizing or aligning nuclei in an examination region of an examination subject U, for example a part of the human body to be examined, located on the patient table 23 and moved into the magnetic resonance system 5 . spin. The high homogeneity of the basic magnetic field required for the nuclear spin resonance measurement is defined in the typically spherical measurement volume M into which the part of the human body to be examined is introduced. In order to meet the homogeneity requirements and in particular to eliminate time-invariant influences, so-called shims made of ferromagnetic material are installed at suitable locations. Time-invariant influences are eliminated by the shims 2 and a suitable control device 27 for the shims 2 .

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Abstract

The invention relates to a method for correcting possible spatial shifts in the excitation of measurement data. At least two measurement data sets are acquired, wherein the second or possibly each additional measurement data set is acquired while switching an additional gradient relative to acquisition of the first measurement data set. A phase difference for the respective measurement points of the measurement data sets is initially determined from the first measurement data set acquired without additional gradient and the respective corresponding data point in the at least one additional measurement data set acquired with additional gradients. A spatial shift of the measurement points of the first measurement data set acquired without additional gradients is determined from the determined phase differences. The magnitude values of the initially measured measurement points are distributed to their correct spatial position corresponding to the determined spatial shifts, whereby a corrected image data set is created. In addition, the present invention also provides a magnetic resonance apparatus, a computer program product and an electronic-readable data medium.

Description

technical field [0001] The invention relates to a method for correcting distortions due to inhomogeneities of a basic magnetic field, a magnetic resonance apparatus, a computer program product and an electronically readable data carrier. Background technique [0002] Magnetic resonance techniques (abbreviated MR for magnetic resonance below) are known techniques that can be used to generate images of the interior of an examination object. Briefly, for this purpose in the magnetic resonance apparatus the examination object is positioned in a relatively strong static homogeneous basic magnetic field (also called B 0 field), so that its nuclear spins are oriented along the fundamental magnetic field. In order to trigger nuclear spin resonances, radio-frequency excitation pulses (RF pulses) are irradiated into the examination object, the triggered nuclear spin resonances are measured as so-called k-space data and MR images are reconstructed or spectroscopic data are determined ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/565A61B5/055
CPCA61B5/055G01R33/56563A61B5/7217
Inventor V.杰鲁斯L.劳尔M.尼特卡
Owner SIEMENS AG
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