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Method for optimizing the K-space trajectories in the location encoding of a magnetic resonance tomography apparatus

A technology of magnetic resonance tomography and equipment, applied in magnetic resonance measurement, measurement using nuclear magnetic resonance image system, material analysis through resonance, etc.

Inactive Publication Date: 2003-10-22
SIEMENS AG
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Problems solved by technology

Current measurement sequences generally use trapezoidal or sinusoidal gradient pulses, wherein when the measurement coordinate system is rotated relative to the coordinate system defined by the direction of the gradient magnetic field, it is difficult to avoid exceeding the amplitude limit value maintained by the single coil due to the combination of vectors and slew rate boundary values

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  • Method for optimizing the K-space trajectories in the location encoding of a magnetic resonance tomography apparatus
  • Method for optimizing the K-space trajectories in the location encoding of a magnetic resonance tomography apparatus
  • Method for optimizing the K-space trajectories in the location encoding of a magnetic resonance tomography apparatus

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Embodiment Construction

[0047] FIG. 1 shows a schematic diagram of a nuclear spin tomography apparatus for generating gradient pulses according to the invention. In this case, the structure of the nuclear spin tomography system corresponds to that of a conventional tomography system. The basic field magnet 1 generates a temporally stable strong magnetic field in order to polarize or orient the nuclear spins in the examination region of an object, for example a part of the human body to be examined. The highly uniform basic magnetic field required for nuclear spin resonance measurement is defined in the spherical measurement space M placed in the part of the human body to be examined. In order to support this homogeneity requirement, in particular to eliminate time-invariant influences, so-called shims made of ferromagnetic material are provided at suitable locations. Time-varying influences are eliminated by the shim coil 2 controlled by the shim power supply 15 .

[0048] In the basic field magnet...

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Abstract

The present invention relates to a method for calculating the scanning path of the k-matrix, under given boundary conditions for the examination of a subject by means of a magnetic resonance tomography apparatus having a gradient amplifier with appertaining gradient coils, an input-display terminal, a sequence controller and a system computer as well as an analog-to-digital converter. The method has the following steps: entering the boundary conditions into the sequence controller or into the system computer via the input-display terminal; calculating the sampling path of the k-matrix taking the boundary conditions into consideration by the sequence controller or the system computer; and determining the gradient current curves by the sequence controller or the system computer that lead to a scanning along the previously calculated scanning path when applied to the corresponding gradient coils with utilization of the ADC.

Description

technical field [0001] The invention generally relates to nuclear spin tomography (synonym: magnetic resonance tomography, MRT) used in medicine for examining patients. In this context, the invention relates in particular to a method for optimizing k-field trajectories in the position coding of a magnetic resonance tomography system. The resulting optimally fast k-matrix scan means the highest possible efficiency of the sequences used. Background technique [0002] MRT is based on the physical phenomenon of nuclear spin resonance, which has been successfully used as an imaging method in the fields of medicine and biophysics for more than 15 years. In this inspection method, the object is placed in a strong, stable magnetic field. As a result, the nuclear spins of the originally disordered atoms in the subject are calibrated. High-frequency waves can now excite these "regular" nuclear spins into defined vibrations. These vibrations generate actual measurement signals in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/48A61B5/055G01R33/54
CPCG01R33/543G01R33/54
Inventor 奥利弗·海德
Owner SIEMENS AG
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