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Magnetic resonance gradient field stimulation level calculation method, device and control method, system

A technology of stimulation level and calculation method, applied in the field of system, device and control method, magnetic resonance gradient field stimulation level calculation method, can solve the problems of low efficiency and precision of magnetic resonance gradient field stimulation level, reduce influence and improve calculation Efficiency, the effect of improving the quality of monitoring

Active Publication Date: 2018-01-16
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 calculation method, device and control method, system
  • Magnetic resonance gradient field stimulation level calculation method, device and control method, system
  • Magnetic resonance gradient field stimulation level calculation method, device and control method, 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 input value Kx and the second input value Ix on the gradient field in the X-axis direction are subjected to floating-point division by the first divider t...

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 with 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 s...

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Abstract

A magnetic resonance gradient field stimulation level calculation method, device, control method, and system, wherein, the magnetic resonance gradient field stimulation level calculation method uses a field programmable gate array to calculate the magnetic resonance gradient field stimulation level, and the magnetic resonance gradient field The control method controls whether the magnetic resonance system stops scanning according to the calculation result of the stimulation level of the magnetic resonance gradient field. By adopting the calculation method, device, control method and system, the calculation efficiency can be improved, the gradient field can be monitored in real time, the monitoring quality can be improved, and the impact of magnetic resonance scanning on the health of the scanning object can be 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 Patents(China)
IPC IPC(8): G01R33/38A61B5/055
Inventor 钱江周辉
Owner SHANGHAI UNITED IMAGING HEALTHCARE
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