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Magnetic resonance gradient field stimulation level calculating method and apparatus, and magnetic resonance gradient field control method and system

A technology of stimulation level and calculation method, which is applied in magnetic resonance measurement, medical science, sensors, etc., can solve the problems of low efficiency and precision of magnetic resonance gradient field stimulation level, achieve the goals of reducing influence, improving monitoring quality, and improving computing efficiency Effect

Active Publication Date: 2015-02-11
SHANGHAI UNITED IMAGING HEALTHCARE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention solves the problem of low efficiency and accuracy in the existing calculation of magnetic resonance gradient field stimulation levels

Method used

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  • Magnetic resonance gradient field stimulation level calculating method and apparatus, and magnetic resonance gradient field control method and system
  • Magnetic resonance gradient field stimulation level calculating method and apparatus, and magnetic resonance gradient field control method and system
  • Magnetic resonance gradient field stimulation level calculating method and apparatus, and magnetic resonance gradient field control method and system

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Experimental program
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Effect test

Embodiment 1

[0086] This embodiment provides a method for calculating the magnetic resonance gradient field stimulation level, using FPGA to calculate the magnetic resonance gradient field stimulation level.

[0087] The magnetic resonance gradient field includes three mutually perpendicular gradient fields, which are respectively the first direction, the second direction and the third direction gradient field. For the convenience of description, in the embodiment of the present invention, the X-axis, Y-axis, and Expressed in the form of the Z axis. It can be understood that, the first, second and third directions and the X-axis, Y-axis and Z-axis can also adopt other corresponding relationships, or the first, second and third directions can also be used In other ways, as long as it can represent three mutually perpendicular gradient fields.

[0088] refer to figure 2 The flow chart of the method for calculating the magnetic resonance gradient field stimulation level is shown, and the m...

Embodiment 2

[0106] Each computing unit may include devices that operate independently, and adopt corresponding computing methods for the data on the gradient field in the corresponding direction. The following combination image 3 Describe in detail through specific steps. The multiple steps in the same dotted box indicate that these steps are executed synchronously, as follows:

[0107] S31, steps S301a, S301b and S301c are executed synchronously.

[0108]Specifically, the first dividing unit may include three mutually independent first, second and third dividers, respectively performing parallel floatation on the first input value and the second input value on the gradient field in one direction. point division operation, each obtains the first output value on the gradient field corresponding to the direction. For example, the first divider carries out floating-point division operation to the first input value Kx and the second input value Ix on the gradient field in the X-axis direct...

Embodiment 3

[0119] As mentioned above, each computing unit may also adopt a time-division multiplexing method for operations on the gradient fields in the three directions. refer to image 3 and Figure 4 ,in image 3 The multiple steps in the same dotted box in , indicate that these steps are performed by the same device, and the specific steps are described in detail below:

[0120] S31, time division multiplexing is adopted, and steps S301a, S301b and S301c are executed sequentially.

[0121] Specifically, the first division unit is a seventh divider, which adopts a time-division multiplexing method, and the seventh divider sequentially performs the first input value and the second input value obtained on the gradient fields of the three directions. Floating-point division operation, sequentially obtain the first output value on the gradient field of the three directions, such as Figure 4 As shown, after the two input terminals of the seventh divider input Kx / Ky / Kz and Ix / Iy / Iz re...

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Abstract

The invention discloses a magnetic resonance gradient field stimulation level calculating method and apparatus, and a magnetic resonance gradient field control method and system. The magnetic resonance gradient field stimulation level calculating method employs a field programmable gate array to calculate the stimulation level of a magnetic resonance gradient field. The magnetic resonance gradient field control method involves controlling whether a magnetic resonance system stops scanning or not according to a calculating result of the stimulation level of the magnetic resonance gradient field. By using the calculation method and apparatus, and the control method and system, the operation efficiency can be improved, higher real-time monitoring can be performed on the gradient field, the monitoring quality is improved, and the influence exerted by magnetic resonance scanning on the health of a scanning object is reduced.

Description

technical field [0001] The present invention relates to the technical field of magnetic resonance, in particular to a method, device, control method and system for calculating stimulation levels of magnetic resonance gradient fields. Background technique [0002] In magnetic resonance imaging systems, gradient fields are required for layer selection and phase encoding, but the human body will have physiological responses to rapidly changing magnetic fields. Excessive changes in the magnetic field can cause discomfort to the human body and even endanger life. Therefore, online real-time monitoring of the gradient field is required. Once the threshold of the human stimulation level is exceeded, the scanning is stopped immediately. [0003] In order to realize the real-time monitoring of the gradient field, it is necessary to calculate the actual stimulation level of the gradient field to the human body in real time. For the three-dimensional space, there are three mutually pe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/38A61B5/055
Inventor 钱江周辉
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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