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A receiving channel combining device for magnetic resonance radio frequency coil

A receiving channel and radio frequency coil technology, which is applied in magnetic resonance measurement and other directions, can solve the problems that the excitation and reception efficiency cannot be achieved, and the excitation and reception of multi-channel radio frequency coil signals are difficult, and achieve the effect of efficient reception and high sensitivity

Active Publication Date: 2019-06-21
WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for non-orthogonal coils, if an interface device such as an orthogonal coupler is still used, the optimal excitation and reception efficiency cannot often be achieved.
[0006] When there is only one channel for a certain imaging nucleus of the magnetic resonance instrument, it is difficult to use a single channel to complete the signal excitation and reception of multiple radio frequency coils.

Method used

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  • A receiving channel combining device for magnetic resonance radio frequency coil
  • A receiving channel combining device for magnetic resonance radio frequency coil
  • A receiving channel combining device for magnetic resonance radio frequency coil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, the inventive device described above is used to adapt multi-channel receiving coils with equal receiving phase differences between adjacent coil loops. , which often corresponds to the situation that the position and direction of each coil channel are distributed axially and enclose the measured space. One receive channel in the magnetic resonance instrument.

[0038] A receiving channel combination device for magnetic resonance radio frequency coils, including the first receiving channel phase shifting circuit to the nth receiving channel phase shifting circuit, also including a multiplexer 2, and a preamplifier power supply circuit 3, and Includes interface plug 4.

[0039] The i-th coil loop is sequentially connected to the input end of the multi-way combiner 2 through the i-th channel preamplifier, the i-th receiving channel phase-shifting circuit, and the output end of the multi-way combiner 2 is connected to the interface plug through a DC blo...

Embodiment 2

[0044] This embodiment describes a specific implementation manner in which four channels of signals are merged into one channel in the case of a four-channel coil with a receiving phase difference of 90 degrees between adjacent coil loops.

[0045] A receiving channel combination device for magnetic resonance radio frequency coils, the multi-channel coil 5 used is a four-channel receiving coil, and the multi-channel combiner 2 is a four-port four-channel combiner.

[0046] Such as figure 2 As shown, the multi-channel coil 5 includes a first coil loop 501 , a second coil loop 502 , a third coil loop 503 , and a fourth coil loop 504 .

[0047] The preamplifier 6 includes a first channel preamplifier 601 , a second channel preamplifier 602 , a third channel preamplifier 603 , and a fourth channel preamplifier 604 .

[0048] The first coil loop 501 is connected to the first channel preamplifier 601 , and the signal output end of the first channel preamplifier 601 is connected to...

Embodiment 3

[0061]In this embodiment, the inventive device described above is used to adapt the multi-channel coil 5 shared by transmitting / receiving with unequal included angles of B1 field vectors generated by multiple coil loops in space. At this time, in order to improve the excitation efficiency and the sensitivity of collecting signals, it is necessary to specially modify the transmitting and receiving paths. The purpose is to combine the signals received by the various coil loops of the multi-channel coil 5 into one, and at the same time ensure that the coil has optimal excitation efficiency.

[0062] A receiving channel combination device for magnetic resonance radio frequency coils, including the first receiving channel phase shifting circuit to the nth receiving channel phase shifting circuit, also including a multiplexer 2, and a preamplifier power supply circuit 3, and Includes interface plug 4.

[0063] The i-th coil loop is sequentially connected to the input end of the mul...

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Abstract

The invention discloses a receiving channel combining device for a magnetic resonance radio-frequency coil. The receiving channel combining device comprises a first coil loop to an nth coil loop, a first channel preamplifier to an nth channel preamplifier, a first receiving channel phase shift circuit to an nth receiving channel phase shift circuit, a multi-channel combiner, a preamplifier power supply circuit and an interface plug, wherein an ith coil loop is connected with an input end of the multi-channel combiner through the ith channel preamplifier and an ith receiving channel phase shift circuit in sequence; an output end of the multi-channel combiner is connected with the interface plug. According to the receiving channel combining device, a plurality of receiving channels for the magnetic resonance radio-frequency coil can be combined for output as a single port, the receiving channel combining device is used for a magnetic resonance instrument with only one receiving port, relevant instrument functions can be conveniently and effectively upgraded and expanded, and the receiving channel combining device has potential important application value.

Description

technical field [0001] The invention relates to the fields of nuclear magnetic resonance spectroscopy and magnetic resonance imaging, in particular to an interface adaptation device for a multi-channel magnetic resonance radio frequency coil and a magnetic resonance instrument host. Background technique [0002] The radio frequency coil is an important component in the magnetic resonance instrument, it undertakes the role of transmitting the excitation pulse to the imaging nucleus and receiving the magnetic resonance signal. There are usually several ways to realize multi-channel measurement: [0003] 1) In order to improve the sampling sensitivity of radio frequency coils and the signal-to-noise ratio of imaging, for different application purposes, current magnetic resonance instruments are usually equipped with multi-channel phase array coils. For traditional magnetic resonance imaging in which the observed nucleus is proton, which is currently quite mature in technology,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R33/36
CPCG01R33/36
Inventor 周欣张鸣石磊孙献平叶朝辉刘买利
Owner WUHAN INST OF PHYSICS & MATHEMATICS CHINESE ACADEMY OF SCI
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