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Fast positioning method of non-fixed radio frequency coil

A technology of radio frequency coil and positioning method, which is applied in magnetic resonance measurement and other directions, can solve the problems of difficulty in determining the relative coordinates of coil units and increase the complexity of hardware design, and achieve the effect of optimizing the scanning process

Active Publication Date: 2019-07-26
ALLTECH MEDICAL SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for those non-fixed coils, such as abdominal coils and lower extremity vascular coils, which have uncertain positions, these coils have variable positions according to different patients in actual use, and it is difficult to determine the relative coordinates of the coil units.
[0004] Some of the current technologies mainly include adding positioning marks on the coil, or adding radio frequency identification chips and detection equipment on the coil, or adding magnetic field induction devices and receiving devices on the radio frequency coil. The position information of the radio frequency coil, but at the same time also caused the complexity of the hardware design to be greatly improved

Method used

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  • Fast positioning method of non-fixed radio frequency coil
  • Fast positioning method of non-fixed radio frequency coil
  • Fast positioning method of non-fixed radio frequency coil

Examples

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Effect test

example 1

[0036] Example 1: Using a body coil and a coil that needs to be positioned, such as a flexible abdominal coil, to scan the three-dimensional volume of the same area at the center of the magnet to generate multiple cross-sectional images. The images corresponding to the two coils are divided to obtain the spatial distribution of coil sensitivity. Integrate the sensitivity in the cross section to obtain the sensitivity curve of the coil along the Z direction.

[0037] Example 2: A possible fast solution can be to set only the Z direction as the reading gradient direction, without adding any phase encoding, and only scan a piece of K-space data in the Z direction to perform one-dimensional Fourier transform to obtain the correspondence between the body coil and the coil to be positioned Z-direction sensitivity curve according to example 1 to calculate the sensitivity curve.

example 3

[0038] Example 3: The sensitivity curve of the coil can also be generated by only using the coil that needs to be positioned to scan an area in the center of the magnet. A possible example is to obtain only a piece of K-space data along the Z direction, and then use methods such as ESPIRIT to analyze the data correlation matrix from the low-frequency components of this K-space data to generate the sensitivity curve of the coil along the Z direction.

[0039]A practical use case is that when the patient is placed on the MRI scanning bed and the corresponding coils are configured, as the scanning bed moves into the magnet cavity, the scanning method such as Example 2 is used to quickly and real-time obtain the data that has entered the magnet cavity. The comprehensive characteristic curve corresponding to the coil. After obtaining the integrated characteristic curves of each row, compare the integrated characteristic curves of the two rows, or find the intersection point of the ...

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Abstract

The invention discloses a fast positioning method for a non-fixed radio frequency coil, comprising the following steps: step 1, dividing all non-fixed radio frequency coils into several unit groups according to spatial positions, each unit group including several radio frequency coil units; step 2. Collect the signal of the measured object along one or more directions to obtain the signal strength characteristic curve of each coil unit; Step 3. According to the signal strength characteristic curve of each coil unit, obtain each coil of the same unit group The signal sensitivity curve of the unit in the same set direction is superimposed on the signal sensitivity curves of all coil units of the same unit group to obtain the comprehensive coil sensitivity curve of the unit group; step 4, the two adjacent unit groups The intersection point of the comprehensive coil sensitivity curve is used as the coordinates where the center of the two unit groups deviates from the center of the magnet in the set direction. The invention can quickly and accurately locate the spatial positions of those non-fixed coils and optimize the scanning process.

Description

technical field [0001] The invention relates to the field of magnetic resonance technology, in particular to a fast positioning method for a non-fixed radio frequency coil. Background technique [0002] With the development of magnetic resonance technology and the maturity of radio frequency surface coil array technology, in clinical application, in addition to the conventional scanning of a single part, the joint scanning of multiple parts of the coil has become more and more a kind of magnetic resonance imaging. If a large-scale joint scan or even a whole-body scan of a moving hospital bed is to be realized, it is necessary to accurately determine the position information of the magnetic resonance coil antenna unit used under the scan coordinates. [0003] The existing coil positioning scheme can input the position information of fixed coils (such as spine coils and head and neck coils) and antenna distribution units into the system software, which can be conveniently disp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/34
CPCG01R33/36
Inventor 王斌李建中汉斯范奥特
Owner ALLTECH MEDICAL SYST