CN113552517A

CN113552517A - 16-channel head-neck-chest coil device for magnetic resonance imaging

Info

Publication number: CN113552517A
Application number: CN202110728204.7A
Authority: CN
Inventors: 张松涛; 李康; 林海洋; 沈江; 谢斌; 何钧
Original assignee: Shanghai Chenguang Medical Technologies Co ltd
Current assignee: Shanghai Chenguang Medical Technologies Co ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-10-26

Abstract

The invention relates to the technical field of magnetic resonance, in particular to a 16-channel head, neck and chest coil device for magnetic resonance imaging. A16-channel neck-chest coil device for magnetic resonance imaging, a plurality of units are arranged in a shell; the head top position is provided with 8 units, and the 8 units are all arranged around the head top position; the face position is provided with 8 units, and the 8 units are all arranged around the face position; 4 or 8 units are arranged at the neck part, and the 4 or 8 units are all arranged around the neck part; the upper chest position is provided with 3 units, and the 3 units are uniformly distributed at the upper part of the chest; the lower chest position be equipped with 3 units to 3 units equipartition are in chest below position. Compared with the prior art, the 16-channel neck-chest coil device for magnetic resonance imaging can be used as an independent coil or a part of an integrated coil.

Description

16-channel head-neck-chest coil device for magnetic resonance imaging

Technical Field

The invention relates to the technical field of magnetic resonance, in particular to a 16-channel head, neck and chest coil device for magnetic resonance imaging.

Background

Magnetic resonance imaging is an advanced technique for non-destructive imaging of the human body and is widely applied to diagnosis of diseases of various parts of the human body. The performance of the magnetic resonance radio frequency coil, which is an important component of the magnetic resonance imaging system, directly determines the quality of the magnetic resonance imaging.

Head scanning and cervico-thoracic scanning are important applications of magnetic resonance, and there are many times when simultaneous neck-thoracic scanning is required, such as large-scale vessel imaging of the head and neck, from the aortic arch of the heart up to the cranial crown. The combined head, neck and chest coil is an important coil of the magnetic resonance system. The currently predominant magnetic resonance system is 16 channels, i.e. all channels of the head, neck and chest together cannot exceed 16 channels. At present, the head of the common 16-channel head-neck-chest coil only has 8 units and outputs 8 channels, the neck and the chest are added to form 8 units and also output 8 channels, so that for the most common head scanning, the 8 channels cannot fully exert the advantage of the 16 channels of the whole magnetic resonance system.

Here the concept of channels and cells is defined: a resonant circuit inside the coil is connected with a preamplifier, which is generally called a unit; the number of channels generally refers to how many paths of signals the coil finally outputs to the spectrometer for analog-to-digital conversion and data processing; usually, each unit outputs a single signal, but sometimes the signals of multiple units are combined, for example, the output signals of two units are combined into a single signal through a two-in-one power combiner and output to a spectrometer, which is a channel, but has two units.

Disclosure of Invention

The invention provides a 16-channel neck-chest coil device for magnetic resonance imaging, which overcomes the defects of the prior art, and can be used as an independent coil or a part of an integrated coil.

In order to achieve the above object, a 16-channel head, neck and chest coil device for magnetic resonance imaging is designed, which comprises a plurality of units, and is characterized in that: the plurality of units are arranged at the top of the head, the face, the neck, the upper chest and the lower chest; the plurality of units are arranged in the shell; the head top position is provided with 8 units, and the 8 units are all arranged around the head top position; the face position is provided with 8 units, and the 8 units are all arranged around the face position; 4 or 8 units are arranged at the neck part, and the 4 or 8 units are all arranged around the neck part; the upper chest position is provided with 3 units, and the 3 units are uniformly distributed at the upper part of the chest; the lower chest position is provided with 3 units, and the 3 units are uniformly distributed at the lower part of the chest; the working method of the 16-channel head, neck and chest coil device is a head mode and a head, neck and chest mode; under the head mode, 8 units at the top of the head and 8 units at the face are directly output to form 16 radio frequency signal output channels; signals of 4 or 8 units of the neck position, 3 units of the upper chest position and 3 units of the lower chest position are not output to the magnetic resonance system; in the neck-chest mode, 8 units at the vertex position and 8 units at the face position are respectively synthesized into 6 radio frequency signal output channels through a first Butler matrix radio frequency synthesizer and a second Butler matrix radio frequency synthesizer; 4 units at the neck position directly form 4 radio frequency signal output channels or 8 units at the neck position are combined into 4 radio frequency signal output channels through 4 two-in-one power combiners; the 3 units at the upper chest position and the 3 units at the lower chest position directly form 6 radio frequency signal output channels.

The 8 units at the head top position are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; the 8 units of the face position are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye position; and 8 units at the top of the head and 8 units at the face are arranged in a staggered way by 22.5 degrees; the 4 units of the neck position are evenly arranged along the circumference, the shape and the size of each unit are basically the same, and the 4 units of the neck position and the 8 units of the face position are arranged in a staggered way by 22.5 degrees.

The 8 units at the head top position are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; the 8 units of the face position are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye position; and 8 units at the top of the head and 8 units at the face are arranged in a staggered way by 22.5 degrees; the 8 units of the neck position are evenly arranged along the circumference, the shape and the size of each unit are basically the same, and the 8 units of the neck position and the 8 units of the face position are arranged in a staggered way by 22.5 degrees.

The 8 units at the top of the head are respectively connected with the first single-pole double-throw radio frequency switch to one end of the eighth single-pole double-throw radio frequency switch, the other end of the first single-pole double-throw radio frequency switch to the eighth single-pole double-throw radio frequency switch is divided into two paths, and one path is respectively connected with the ninth single-pole double-throw radio frequency switch to the sixteenth single-pole double-throw radio frequency switch; the other path is connected with the input end of the first Butler matrix radio frequency synthesizer, the output end of the first Butler matrix radio frequency synthesizer is divided into eight paths, the three paths are respectively connected with the ninth single-pole double-throw radio frequency switch, the tenth single-pole double-throw radio frequency switch and the eleventh single-pole double-throw radio frequency switch, and the rest five paths are respectively grounded through a first resistor to a fifth resistor; the 8 units at the face position are respectively connected with one end of a seventeenth single-pole double-throw radio frequency switch to a twenty-fourth single-pole double-throw radio frequency switch, the other end of the seventeenth single-pole double-throw radio frequency switch to the twenty-fourth single-pole double-throw radio frequency switch is divided into two paths, and one path is connected with a twenty-fifth single-pole double-throw radio frequency switch to a thirty-second single-pole double-throw radio frequency switch; the other path is connected with the input end of a second Butler matrix radio frequency synthesizer, the output end of the second Butler matrix radio frequency synthesizer is divided into eight paths, the three paths are respectively connected with a twelfth single-pole double-throw radio frequency switch, a thirteenth single-pole double-throw radio frequency switch and a fourteenth single-pole double-throw radio frequency switch, and the rest five paths are respectively grounded through a sixth resistor to a tenth resistor; the 3 units at the upper chest position are respectively connected with a thirty-third single-pole double-throw radio frequency switch to one end of a thirty-fifth single-pole double-throw radio frequency switch, the other end of the thirty-third single-pole double-throw radio frequency switch to the other end of the thirty-fifth single-pole double-throw radio frequency switch is divided into two paths, and one path is respectively grounded through an eleventh resistor to a thirteenth resistor; the other path is respectively connected with a fifteenth single-pole double-throw radio frequency switch, a sixteenth single-pole double-throw radio frequency switch and a twenty-fifth single-pole double-throw radio frequency switch; the 3 units at the lower chest position are respectively connected with a thirty-sixth single-pole double-throw radio frequency switch to one end of a thirty-eighth single-pole double-throw radio frequency switch, the other end of the thirty-sixth single-pole double-throw radio frequency switch to the thirty-eighth single-pole double-throw radio frequency switch is divided into two paths, and one path is grounded through a fourteenth resistor to a sixteenth resistor; the other path is respectively connected with a twenty-sixth single-pole double-throw radio frequency switch to a twenty-eighth single-pole double-throw radio frequency switch; the 4 units at the neck position are respectively connected with a thirty-ninth single-pole double-throw radio frequency switch to one end of a forty-second single-pole double-throw radio frequency switch, the thirty-ninth single-pole double-throw radio frequency switch to the other end of the forty-second single-pole double-throw radio frequency switch are divided into two paths, and one path is grounded through a seventeenth resistor to a twentieth resistor; the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch to a thirty-second single-pole double-throw radio frequency switch; the other ends of the ninth single-pole double-throw radio frequency switch to the sixteenth single-pole double-throw radio frequency switch and the twenty-fifth single-pole double-throw radio frequency switch to the thirty-second single-pole double-throw radio frequency switch are respectively connected with a signal output end.

The 8 units at the top of the head are respectively connected with the first single-pole double-throw radio frequency switch to one end of the eighth single-pole double-throw radio frequency switch, the other end of the first single-pole double-throw radio frequency switch to the eighth single-pole double-throw radio frequency switch is divided into two paths, and one path is respectively connected with the ninth single-pole double-throw radio frequency switch to the sixteenth single-pole double-throw radio frequency switch; the other path is connected with the input end of the first Butler matrix radio frequency synthesizer, the output end of the first Butler matrix radio frequency synthesizer is divided into eight paths, the three paths are respectively connected with the ninth single-pole double-throw radio frequency switch, the tenth single-pole double-throw radio frequency switch and the eleventh single-pole double-throw radio frequency switch, and the rest five paths are respectively grounded through a first resistor to a fifth resistor; the 8 units at the face position are respectively connected with one end of a seventeenth single-pole double-throw radio frequency switch to a twenty-fourth single-pole double-throw radio frequency switch, the other end of the seventeenth single-pole double-throw radio frequency switch to the twenty-fourth single-pole double-throw radio frequency switch is divided into two paths, and one path is connected with a twenty-fifth single-pole double-throw radio frequency switch to a thirty-second single-pole double-throw radio frequency switch; the other path is connected with the input end of a second Butler matrix radio frequency synthesizer, the output end of the second Butler matrix radio frequency synthesizer is divided into eight paths, the three paths are respectively connected with a twelfth single-pole double-throw radio frequency switch, a thirteenth single-pole double-throw radio frequency switch and a fourteenth single-pole double-throw radio frequency switch, and the rest five paths are respectively grounded through a sixth resistor to a tenth resistor; the 3 units at the upper chest position are respectively connected with a thirty-third single-pole double-throw radio frequency switch to one end of a thirty-fifth single-pole double-throw radio frequency switch, the other end of the thirty-third single-pole double-throw radio frequency switch to the other end of the thirty-fifth single-pole double-throw radio frequency switch is divided into two paths, and one path is respectively grounded through an eleventh resistor to a thirteenth resistor; the other path is respectively connected with a fifteenth single-pole double-throw radio frequency switch, a sixteenth single-pole double-throw radio frequency switch and a twenty-fifth single-pole double-throw radio frequency switch; the 3 units at the lower chest position are respectively connected with a thirty-sixth single-pole double-throw radio frequency switch to one end of a thirty-eighth single-pole double-throw radio frequency switch, the other end of the thirty-sixth single-pole double-throw radio frequency switch to the thirty-eighth single-pole double-throw radio frequency switch is divided into two paths, and one path is grounded through a fourteenth resistor to a sixteenth resistor; the other path is respectively connected with a twenty-sixth single-pole double-throw radio frequency switch to a twenty-eighth single-pole double-throw radio frequency switch; 8 units at the neck position are combined to form 4 channels through a first two-in-one power combiner to a fourth two-in-one power combiner respectively, the 4 channels are connected with a thirty-ninth single-pole double-throw radio frequency switch to one end of a forty-second single-pole double-throw radio frequency switch respectively, the other end of the thirty-ninth single-pole double-throw radio frequency switch to the forty-second single-pole double-throw radio frequency switch is divided into two paths, and one path is grounded through a seventeenth resistor to a twentieth resistor respectively; the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch to a thirty-second single-pole double-throw radio frequency switch; the other ends of the ninth single-pole double-throw radio frequency switch to the sixteenth single-pole double-throw radio frequency switch and the twenty-fifth single-pole double-throw radio frequency switch to the thirty-second single-pole double-throw radio frequency switch are respectively connected with a signal output end.

The first to forty-second single-pole double-throw rf switches are RFSW1012 of Qorvo corporation.

The invention discloses a novel 16-channel head-neck-chest coil device for magnetic resonance imaging, which has more than 16 units inside the coil. The head and the face have two rows of unit parts, each row has 16 units of 8 units, each row has 4 units or 8 units of the neck, each row has 3 units of the upper chest, and each row has 3 units of the lower chest. The head, neck and chest coil has two physical working modes, namely a head mode and a head, neck and chest mode, under the head mode, all 16 units of the head directly output radio frequency signals of 16 channels, so that a high head image signal-to-noise ratio can be obtained, and a larger parallel scanning acceleration factor can be supported due to a large number of channels; in the neck-chest mode, 16 units of the head are combined into 6 output signal channels by two 8x8 Butler Matrix (Butler Matrix) radio frequency combiners, and the output signals are output by 16 channels in total together with 4 channels of 4 units of the neck (or 4 channels combined by 8 units), 3 channels of 3 units of the upper chest and 3 channels of 3 units of the lower chest.

The invention has the advantages that: in the head mode, when the head is scanned, 16 independent units covering the head area work together, so that an image with high signal-to-noise ratio and higher parallel scanning acceleration factors can be obtained; in the neck-chest mode, 16 units of the head are combined into 6 channels, and due to the effectiveness of the Butler matrix combination mode, the signal-to-noise ratio of the head is not remarkably reduced; meanwhile, the neck and the chest are provided with 10 channels, so that good signal-to-noise ratio image quality of the neck and the chest can be obtained; a wide range of high signal-to-noise ratio images can be obtained.

Compared with the prior art, the invention provides the 16-channel head, neck and chest coil device for magnetic resonance imaging, which can be used as an independent coil or a part of an integrated coil. In case of being a part of an integrated coil, the 3 channels of the lower chest can also be arranged inside the hospital bed together with the radio frequency units of other spine coils, and even the head, neck and upper chest can also be arranged separately in different housings, so that flexible disassembly and assembly combinations can be achieved.

Drawings

FIG. 1 is a schematic view of the structure of the present invention.

FIG. 2 is a top view of the structure of the present invention.

Fig. 3 is a side view of the structure of the present invention.

FIG. 4 is a schematic diagram of the electrical connections of the present invention with 4 channels in the neck region.

FIG. 5 is a schematic diagram of a circuit connection with 8 channels in the neck region according to the present invention.

Referring to fig. 2, fig. 3, 1 is the shell, 2 is the top of the head position, 3 is the face position, 4 is the neck position, 5 is the upper chest position, and 6 is the lower chest position.

Detailed Description

The invention is further illustrated below with reference to the accompanying drawings.

As shown in fig. 1 to 5, a plurality of units are arranged at a head top position 2, a face position 3, a neck position 4, an upper chest position 5 and a lower chest position 6; the units are arranged in the shell 1; the head top position 2 is provided with 8 units, and the 8 units are all arranged around the head top position; the face position 3 is provided with 8 units, and the 8 units are all distributed around the face position; 4 or 8 units are arranged at the neck position 4, and the 4 or 8 units are all arranged around the neck position; the upper chest position 5 is provided with 3 units, and the 3 units are uniformly distributed at the upper part of the chest; the lower chest position 6 is provided with 3 units, and the 3 units are uniformly distributed at the lower part of the chest; the working method of the 16-channel head, neck and chest coil device is a head mode and a head, neck and chest mode; under the head mode, 8 units at the head top position 2 and 8 units at the face position 3 are directly output to form 16 radio frequency signal output channels; signals of 4 or 8 units of the neck position 4, 3 units of the upper chest position 5 and 3 units of the lower chest position 6 are not output to the magnetic resonance system; in the neck-chest mode, 8 units at the vertex position 2 and 8 units at the face position 3 are combined into 6 radio frequency signal output channels through a first Butler matrix radio frequency combiner BM1 and a second Butler matrix radio frequency combiner BM2 respectively; 4 units at the neck position 4 directly form 4 radio frequency signal output channels or 8 units at the neck position 4 are synthesized into 4 radio frequency signal output channels through 4 two-in-one power synthesizers PWR1-PWR 4; the 3 units of the upper chest position 5 and the 3 units of the lower chest position 6 directly form 6 radio frequency signal output channels.

8 units at the head top position 2 are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; 8 units of the face position 3 are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye positions; and 8 units at the head top position 2 and 8 units at the face position 3 are arranged in a staggered way by 22.5 degrees; the 4 cells of the neck position 4 are uniformly arranged along the circumference, the shape and size of each cell are substantially the same, and the 4 cells of the neck position 4 and the 8 cells of the face position 3 are arranged in a staggered manner by 22.5 degrees.

8 units at the head top position 2 are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; 8 units of the face position 3 are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye positions; and 8 units at the head top position 2 and 8 units at the face position 3 are arranged in a staggered way by 22.5 degrees; the 8 cells of the neck position 4 are evenly arranged along the circumference, the shape and size of each cell are substantially the same, and the 8 cells of the neck position 4 and the 8 cells of the face position 3 are arranged in a staggered manner by 22.5 degrees.

The 8 units at the head top position 2 are respectively connected with one ends of a first single-pole double-throw radio frequency switch SW1 to an eighth single-pole double-throw radio frequency switch SW8, the other ends of the first single-pole double-throw radio frequency switch SW1 to the eighth single-pole double-throw radio frequency switch SW8 are divided into two paths, and one path is respectively connected with a ninth single-pole double-throw radio frequency switch SW17 to a sixteenth single-pole double-throw radio frequency switch SW 24; the other path is connected with the input end of a first Butler matrix radio frequency synthesizer BM1, the output end of the first Butler matrix radio frequency synthesizer BM1 is divided into eight paths, the three paths are respectively connected with a ninth single-pole double-throw radio frequency switch SW17, a tenth single-pole double-throw radio frequency switch SW18 and an eleventh single-pole double-throw radio frequency switch SW19, and the rest five paths are respectively grounded through a first resistor R1 to a fifth resistor R5; the 8 units of the face position 3 are respectively connected with one ends of a seventeenth single-pole double-throw radio frequency switch SW9 to a twenty-fourth single-pole double-throw radio frequency switch SW16, the other ends of the seventeenth single-pole double-throw radio frequency switch SW9 to the twenty-fourth single-pole double-throw radio frequency switch SW16 are divided into two paths, and one path is connected with a twenty-fifth single-pole double-throw radio frequency switch SW25 to a thirty-second single-pole double-throw radio frequency switch SW 32; the other path is connected with the input end of a second Butler matrix radio frequency synthesizer BM2, the output end of the second Butler matrix radio frequency synthesizer BM2 is divided into eight paths, the three paths are respectively connected with a twelfth single-pole double-throw radio frequency switch SW20, a thirteenth single-pole double-throw radio frequency switch SW21 and a fourteenth single-pole double-throw radio frequency switch SW22, and the rest five paths are respectively grounded through a sixth resistor R6 to a tenth resistor R10; 3 units at the chest up position 5 are respectively connected with one ends of a thirty-third single-pole double-throw radio frequency switch SW33 to a thirty-fifth single-pole double-throw radio frequency switch SW35, the other ends of the thirty-third single-pole double-throw radio frequency switch SW33 to a thirty-fifth single-pole double-throw radio frequency switch SW35 are divided into two paths, and one path is respectively grounded through an eleventh resistor R11 to a thirteenth resistor R13; the other path is respectively connected with a fifteenth single-pole double-throw radio frequency switch SW23, a sixteenth single-pole double-throw radio frequency switch SW24 and a twenty-fifth single-pole double-throw radio frequency switch SW 25; 3 units at the lower chest position 6 are respectively connected with one ends of a thirty-sixth single-pole double-throw radio frequency switch SW36 to a thirty-eighth single-pole double-throw radio frequency switch SW38, the other ends of the thirty-sixth single-pole double-throw radio frequency switch SW36 to a thirty-eighth single-pole double-throw radio frequency switch SW38 are divided into two paths, and one path is respectively grounded through a fourteenth resistor R14 to a sixteenth resistor R16; the other path is respectively connected with a twenty-sixth single-pole double-throw radio frequency switch SW26 to a twenty-eighth single-pole double-throw radio frequency switch SW 28; 4 units at the neck position 4 are respectively connected with one ends of a thirty-ninth single-pole double-throw radio frequency switch SW39 to a forty-second single-pole double-throw radio frequency switch SW42, the other ends of the thirty-ninth single-pole double-throw radio frequency switch SW39 to the forty-second single-pole double-throw radio frequency switch SW42 are divided into two paths, and one path is respectively grounded through a seventeenth resistor R17 to a twentieth resistor R20; the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch SW29 to a thirty-second single-pole double-throw radio frequency switch SW 32; the other ends of the ninth single-pole double-throw radio frequency switch SW17 to the sixteenth single-pole double-throw radio frequency switch SW24 and the twenty-fifth single-pole double-throw radio frequency switch SW25 to the thirty-second single-pole double-throw radio frequency switch SW32 are respectively connected with a signal output end.

The 8 units at the head top position 2 are respectively connected with one ends of a first single-pole double-throw radio frequency switch SW1 to an eighth single-pole double-throw radio frequency switch SW8, the other ends of the first single-pole double-throw radio frequency switch SW1 to the eighth single-pole double-throw radio frequency switch SW8 are divided into two paths, and one path is respectively connected with a ninth single-pole double-throw radio frequency switch SW17 to a sixteenth single-pole double-throw radio frequency switch SW 24; the other path is connected with the input end of a first Butler matrix radio frequency synthesizer BM1, the output end of the first Butler matrix radio frequency synthesizer BM1 is divided into eight paths, the three paths are respectively connected with a ninth single-pole double-throw radio frequency switch SW17, a tenth single-pole double-throw radio frequency switch SW18 and an eleventh single-pole double-throw radio frequency switch SW19, and the rest five paths are respectively grounded through a first resistor R1 to a fifth resistor R5; the 8 units of the face position 3 are respectively connected with one ends of a seventeenth single-pole double-throw radio frequency switch SW9 to a twenty-fourth single-pole double-throw radio frequency switch SW16, the other ends of the seventeenth single-pole double-throw radio frequency switch SW9 to the twenty-fourth single-pole double-throw radio frequency switch SW16 are divided into two paths, and one path is connected with a twenty-fifth single-pole double-throw radio frequency switch SW25 to a thirty-second single-pole double-throw radio frequency switch SW 32; the other path is connected with the input end of a second Butler matrix radio frequency synthesizer BM2, the output end of the second Butler matrix radio frequency synthesizer BM2 is divided into eight paths, the three paths are respectively connected with a twelfth single-pole double-throw radio frequency switch SW20, a thirteenth single-pole double-throw radio frequency switch SW21 and a fourteenth single-pole double-throw radio frequency switch SW22, and the rest five paths are respectively grounded through a sixth resistor R6 to a tenth resistor R10; 3 units at the chest up position 5 are respectively connected with one ends of a thirty-third single-pole double-throw radio frequency switch SW33 to a thirty-fifth single-pole double-throw radio frequency switch SW35, the other ends of the thirty-third single-pole double-throw radio frequency switch SW33 to a thirty-fifth single-pole double-throw radio frequency switch SW35 are divided into two paths, and one path is respectively grounded through an eleventh resistor R11 to a thirteenth resistor R13; the other path is respectively connected with a fifteenth single-pole double-throw radio frequency switch SW23, a sixteenth single-pole double-throw radio frequency switch SW24 and a twenty-fifth single-pole double-throw radio frequency switch SW 25; 3 units at the lower chest position 6 are respectively connected with one ends of a thirty-sixth single-pole double-throw radio frequency switch SW36 to a thirty-eighth single-pole double-throw radio frequency switch SW38, the other ends of the thirty-sixth single-pole double-throw radio frequency switch SW36 to a thirty-eighth single-pole double-throw radio frequency switch SW38 are divided into two paths, and one path is respectively grounded through a fourteenth resistor R14 to a sixteenth resistor R16; the other path is respectively connected with a twenty-sixth single-pole double-throw radio frequency switch SW26 to a twenty-eighth single-pole double-throw radio frequency switch SW 28; 8 units at the neck position 4 are respectively combined through a first two-in-one power combiner PWR1 to a fourth two-in-one power combiner PWR4 to form 4 channels, the 4 channels are respectively connected with one ends of a thirty-ninth single-pole double-throw radio frequency switch SW39 to a forty-second single-pole double-throw radio frequency switch SW42, the other ends of the thirty-ninth single-pole double-throw radio frequency switch SW39 to the forty-second single-pole double-throw radio frequency switch SW42 are divided into two channels, and one channel is grounded through a seventeenth resistor R17 to a twentieth resistor R20; the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch SW29 to a thirty-second single-pole double-throw radio frequency switch SW 32; the other ends of the ninth single-pole double-throw radio frequency switch SW17 to the sixteenth single-pole double-throw radio frequency switch SW24 and the twenty-fifth single-pole double-throw radio frequency switch SW25 to the thirty-second single-pole double-throw radio frequency switch SW32 are respectively connected with a signal output end.

The first to forty-second single pole double throw rf switches SW1 to SW42 are model number Qorvo corporation's RFSW 1012.

Fig. 1 to fig. 3 are schematic diagrams of radio frequency unit distribution of a 16-channel cephalothoracic coil, which are disclosed by the present invention, wherein 4 rows, 8 units on the top of the head, 8 units on the face, 4 units or 8 units on the neck are distributed from the top of the head to the chest, and 6 units are arranged on the chest, which are divided into an upper chest and a lower chest, and 3 units are arranged respectively.

The 8 annular units at the top of the head are basically and uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; the 8 annular units of the face are basically and uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; the 8 units of face one row, two topmost units correspond to the position of two eyes, so just can be in the center of unit the coil shell trompil to can make patient's eyes can see the outside, prevent or reduce claustrophobia. The 8 units on the top of the head and the 8 units on the face are arranged in a staggered mode.

Each cell overlaps its immediate neighbors to zero or minimize their mutual inductance. The isolation problem is solved by using amplifiers with low input impedance between the rest units.

The 3 units of the upper chest and the 3 units of the lower chest are arranged along the left-right direction, and the middle channel is over against the heart and the cervical vertebra, so that the signals can be detected most effectively. The cells on both sides can see the region of interest such as brachial plexus.

As shown in fig. 4, the output signals of 16 units of the head, 4 units of the neck, and 6 units of the chest are connected to a switch matrix.

SW1-SW42 are all single-pole double-throw radio frequency switches, two 8x8 Butler Matrix (Butler Matrix) radio frequency synthesizers of BM1 and BM2, and R1-R20 are all 50 omega resistors. Among them, P1 to P8 joint the top 8 cells, and P9 to P16 joint the 8 cells of the face. P39-P42 connects 4 units of the neck, P33-P35 connects 3 units of the chest, and P36-P38 connects 3 units of the chest. The 16 paths of signals output by the coils are output by the P17-P32 through system cables to a spectrometer for analog-digital conversion, digital processing and calculation.

The butler matrix radio frequency synthesizer is commonly used for beam synthesis of phased array radar and also for synthesis of magnetic resonance signals. After 8 units of magnetic resonance signals uniformly distributed on a cylinder in 360 degrees along the circumference are synthesized by an 8x8 Butler matrix synthesizer, the output 3 paths of signals (+ 45 degrees, +90 degrees, +135 degrees) can basically contain all effective magnetic resonance signals due to the circular polarization characteristic of the magnetic resonance signals, and the other 5 paths of signals (-45 degrees, -90 degrees, -135 degrees, 0 degrees, 180 degrees) basically have no effective signals. Wherein 45 degrees is a uniform birdcage mode, which is the most effective path of signal with the highest signal-to-noise ratio, and then +90 degrees and +135 degrees.

As shown in fig. 4, all 42 single pole double throw rf switches are controlled synchronously, and in the switch state shown in the figure, the signals of all 16 head cells are output directly to the spectrometer, while the signals of 4 cells in the neck and 6 cells in the chest are output to a 50 ohm resistive load and not to the spectrometer. The mode is a head mode, which is one of the most common application scenarios of magnetic resonance scanning, in the mode, 16 radio frequency unit loops are wrapped around the head, all 16 channels of the system are fully utilized, image quality with high signal-to-noise ratio can be obtained, and higher parallel scanning acceleration factor can be obtained due to more channels, so that less scanning time is needed.

In the neck-chest mode, all the single-pole double-throw rf switches are switched to the other side, and at this time, the signals of the top 8 cells are output to the first butler matrix rf synthesizer BM1, and the most effective 3-way signals (+ 45 degrees, +90 degrees, +135 degrees) output by the first butler matrix rf synthesizer are output to the P17-P19 ports through the switches SW17-SW19 and finally output to the spectrometer. Similarly, the signals of 8 units of the face are output to the second butler matrix radio frequency switch BM2, and the most effective 3-way signals (+ 45 degrees, +90 degrees, +135 degrees) output by the second butler matrix radio frequency switch BM2 are output to the P20-P22 ports through the switches SW20-SW22 and finally output to the spectrometer. The signals of the 6 cells of the chest and 4 cells of the neck are also output to ports P23-P32 via switches SW23-SW32 and finally to the spectrometer. In this mode, due to the effectiveness of the butler matrix radio frequency synthesizer, the signal-to-noise ratio of the head is not obviously reduced, and the neck and the chest have 10 channels of signals, so that the image quality of the neck and the chest is high, a large scanning visual field is obtained, and a large-range blood vessel image of the heart aortic arch from the vertex of the skull can be obtained at one time.

If 8 units are arranged on the neck, the 8 units on the neck are firstly synthesized, the simplest mode is two-in-two unit synthesis, namely the two units are synthesized into one channel output through a two-in-one power synthesizer, and then the 8 units still output 4 channels.

As shown in fig. 5, the output signals of 16 units of the head, 8 units of the neck, and 6 units of the chest are connected to the switch matrix shown in fig. 5.

SW1-SW42 are all single-pole double-throw radio frequency switches, BM1 and BM2 are two 8x8 Butler Matrix (Butler Matrix) radio frequency synthesizers, R1-R20 are all 50 omega resistors, and PWR1-PWR4 are all power synthesizers. Among them, P1 to P8 joint the top 8 cells, and P9 to P16 joint the 8 cells of the face. P39-P46 connects 8 units of the neck, P33-P35 connects 3 units of the chest, and P36-P38 connects 3 units of the chest. The 16 paths of signals output by the coils are output by the P17-P32 through system cables to a spectrometer for analog-digital conversion, digital processing and calculation.

As shown in fig. 5, all 42 single pole double throw rf switches are controlled synchronously, and in the switch state shown in the figure, the signals of all 16 head cells are output directly to the spectrometer, while the signals of 8 cells in the neck and 6 cells in the chest are output to a 50 ohm resistive load and not to the spectrometer. The mode is a head mode, which is one of the most common application scenarios of magnetic resonance scanning, in the mode, 16 radio frequency unit loops are wrapped around the head, all 16 channels of the system are fully utilized, image quality with high signal-to-noise ratio can be obtained, and higher parallel scanning acceleration factor can be obtained due to more channels, so that less scanning time is needed.

In the neck-chest mode, all the single-pole double-throw rf switches are switched to the other side, and at this time, the signals of the top 8 cells are output to the first butler matrix rf synthesizer BM1, and the most effective 3-way signals (+ 45 degrees, +90 degrees, +135 degrees) output by the first butler matrix rf synthesizer are output to the P17-P19 ports through the switches SW17-SW19 and finally output to the spectrometer. Similarly, the signals of 8 units of the face are output to the second butler matrix radio frequency switch BM2, and the most effective 3-way signals (+ 45 degrees, +90 degrees, +135 degrees) output by the second butler matrix radio frequency switch BM2 are output to the P20-P22 ports through the switches SW20-SW22 and finally output to the spectrometer. Signals of 6 units of the chest and 8 units of the neck, wherein the 8 units of the neck are combined to form 4 channels by 4 power combiners PWR1-PWR4, and the chest and neck units are output to ports P23-P32 through switches SW23-SW32 and finally to the spectrometer. In this mode, due to the effectiveness of the butler matrix radio frequency synthesizer, the signal-to-noise ratio of the head is not obviously reduced, and the neck and the chest have 10 channels of signals, so that the image quality of the neck and the chest is high, a large scanning visual field is obtained, and a large-range blood vessel image of the heart aortic arch from the vertex of the skull can be obtained at one time.

The present invention may be used as a separate coil or as a part of an integrated coil. In case of being a part of an integrated coil, the 3 channels of the lower chest can also be arranged inside the hospital bed together with the radio frequency units of other spine coils, and even the head, neck and upper chest can also be arranged separately in different housings, so that flexible disassembly and assembly combinations can be achieved.

Claims

1. A 16-channel neck-chest coil device for magnetic resonance imaging, comprising a plurality of units, characterized in that: the plurality of units are arranged at a head top position (2), a face position (3), a neck position (4), an upper chest position (5) and a lower chest position (6); the units are arranged in the shell (1); the head top position (2) is provided with 8 units, and the 8 units are all arranged around the head top position; the face position (3) is provided with 8 units, and the 8 units are all distributed around the face position; the neck position (4) is provided with 4 or 8 units, and the 4 or 8 units are all arranged around the neck position; the upper chest position (5) is provided with 3 units, and the 3 units are uniformly distributed at the upper part of the chest; the lower chest position (6) is provided with 3 units, and the 3 units are uniformly distributed at the lower part of the chest; the working method of the 16-channel head, neck and chest coil device is a head mode and a head, neck and chest mode;

under the head mode, 8 units at the head top position (2) and 8 units at the face position (3) are directly output to form 16 radio frequency signal output channels; signals of 4 or 8 units of the neck position (4), 3 units of the upper chest position (5) and 3 units of the lower chest position (6) are not output to the magnetic resonance system;

in the neck-chest mode, 8 units at the vertex position (2) and 8 units at the face position (3) are combined into 6 radio frequency signal output channels through a first Butler matrix radio frequency combiner (BM 1) and a second Butler matrix radio frequency combiner (BM 2) respectively; 4 units of the neck position (4) directly form 4 radio frequency signal output channels or 8 units of the neck position (4) are combined into 4 radio frequency signal output channels through 4 two-in-one power combiners (PWR 1-PWR 4); the 3 units of the upper chest position (5) and the 3 units of the lower chest position (6) directly form 6 radio frequency signal output channels.

2. A 16-channel whiplash coil apparatus for magnetic resonance imaging as claimed in claim 1, wherein: 8 units of the head top position (2) are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; 8 units of the face position (3) are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye positions; 8 units of the head top position (2) and 8 units of the face position (3) are arranged in a staggered mode by 22.5 degrees; the 4 units of the neck position (4) are uniformly arranged along the circumference, the shape and the size of each unit are basically the same, and the 4 units of the neck position (4) and the 8 units of the face position (3) are arranged in a staggered mode by 22.5 degrees.

3. A 16-channel whiplash coil apparatus for magnetic resonance imaging as claimed in claim 1, wherein: 8 units of the head top position (2) are uniformly distributed along the circumference, and the shape and the size of each unit are basically the same; 8 units of the face position (3) are uniformly distributed along the circumference, the shape and the size of each unit are basically the same, and 2 units are positioned at the eye positions; 8 units of the head top position (2) and 8 units of the face position (3) are arranged in a staggered mode by 22.5 degrees; the 8 units of the neck position (4) are uniformly arranged along the circumference, the shape and the size of each unit are basically the same, and the 8 units of the neck position (4) and the 8 units of the face position (3) are arranged in a staggered mode of 22.5 degrees.

4. A 16-channel whiplash coil apparatus for magnetic resonance imaging as claimed in claim 1, wherein: 8 units of the head top position (2) are respectively connected with one ends of a first single-pole double-throw radio frequency switch (SW 1) to an eighth single-pole double-throw radio frequency switch (SW 8), the other ends of the first single-pole double-throw radio frequency switch (SW 1) to the eighth single-pole double-throw radio frequency switch (SW 8) are divided into two paths, and one path is respectively connected with a ninth single-pole double-throw radio frequency switch (SW 17) to a sixteenth single-pole double-throw radio frequency switch (SW 24); the other path is connected with the input end of a first Butler matrix radio frequency synthesizer (BM 1), the output end of the first Butler matrix radio frequency synthesizer (BM 1) is divided into eight paths, the three paths are respectively connected with a ninth single-pole double-throw radio frequency switch (SW 17), a tenth single-pole double-throw radio frequency switch (SW 18) and an eleventh single-pole double-throw radio frequency switch (SW 19), and the rest five paths are respectively grounded through a first resistor (R1) to a fifth resistor (R5);

8 units of the face position (3) are respectively connected with one ends of a seventeenth single-pole double-throw radio frequency switch (SW 9) to a twenty-fourth single-pole double-throw radio frequency switch (SW 16), the other ends of the seventeenth single-pole double-throw radio frequency switch (SW 9) to the twenty-fourth single-pole double-throw radio frequency switch (SW 16) are divided into two paths, and one path is connected with the twenty-fifth single-pole double-throw radio frequency switch (SW 25) to the thirty-second single-pole double-throw radio frequency switch (SW 32); the other path is connected with the input end of a second Butler matrix radio frequency synthesizer (BM 2), the output end of the second Butler matrix radio frequency synthesizer (BM 2) is divided into eight paths, the three paths are respectively connected with a twelfth single-pole double-throw radio frequency switch (SW 20), a thirteenth single-pole double-throw radio frequency switch (SW 21) and a fourteenth single-pole double-throw radio frequency switch (SW 22), and the rest five paths are respectively grounded through a sixth resistor (R6) to a tenth resistor (R10);

3 units of the upper chest position (5) are respectively connected with one ends of a thirty-third single-pole double-throw radio frequency switch (SW 33) to a thirty-fifth single-pole double-throw radio frequency switch (SW 35), the other ends of the thirty-third single-pole double-throw radio frequency switch (SW 33) to the thirty-fifth single-pole double-throw radio frequency switch (SW 35) are divided into two paths, and one path is respectively grounded through an eleventh resistor (R11) to a thirteenth resistor (R13); the other path is respectively connected with a fifteenth single-pole double-throw radio frequency switch (SW 23), a sixteenth single-pole double-throw radio frequency switch (SW 24) and a twenty-fifth single-pole double-throw radio frequency switch (SW 25);

3 units of the lower chest position (6) are respectively connected with one ends of a thirty-sixth single-pole double-throw radio frequency switch (SW 36) to a thirty-eighth single-pole double-throw radio frequency switch (SW 38), the other ends of the thirty-sixth single-pole double-throw radio frequency switch (SW 36) to the thirty-eighth single-pole double-throw radio frequency switch (SW 38) are divided into two paths, and one path is respectively grounded through a fourteenth resistor (R14) to a sixteenth resistor (R16); the other path is respectively connected with a twenty-sixth single-pole double-throw radio frequency switch (SW 26) to a twenty-eighth single-pole double-throw radio frequency switch (SW 28);

4 units of the neck position (4) are respectively connected with a thirty-ninth single-pole double-throw radio frequency switch (SW 39) to one end of a forty-second single-pole double-throw radio frequency switch (SW 42), the thirty-ninth single-pole double-throw radio frequency switch (SW 39) to the other end of the forty-second single-pole double-throw radio frequency switch (SW 42) are divided into two paths, and one path is grounded through a seventeenth resistor (R17) to a twentieth resistor (R20); the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch (SW 29) to a thirty-second single-pole double-throw radio frequency switch (SW 32);

the other ends of the ninth single-pole double-throw radio frequency switch (SW 17) to the sixteenth single-pole double-throw radio frequency switch (SW 24) and the twenty-fifth single-pole double-throw radio frequency switch (SW 25) to the thirty-second single-pole double-throw radio frequency switch (SW 32) are respectively connected with a signal output end.

5. A 16-channel whiplash coil apparatus for magnetic resonance imaging as claimed in claim 1, wherein: 8 units of the head top position (2) are respectively connected with one ends of a first single-pole double-throw radio frequency switch (SW 1) to an eighth single-pole double-throw radio frequency switch (SW 8), the other ends of the first single-pole double-throw radio frequency switch (SW 1) to the eighth single-pole double-throw radio frequency switch (SW 8) are divided into two paths, and one path is respectively connected with a ninth single-pole double-throw radio frequency switch (SW 17) to a sixteenth single-pole double-throw radio frequency switch (SW 24); the other path is connected with the input end of a first Butler matrix radio frequency synthesizer (BM 1), the output end of the first Butler matrix radio frequency synthesizer (BM 1) is divided into eight paths, the three paths are respectively connected with a ninth single-pole double-throw radio frequency switch (SW 17), a tenth single-pole double-throw radio frequency switch (SW 18) and an eleventh single-pole double-throw radio frequency switch (SW 19), and the rest five paths are respectively grounded through a first resistor (R1) to a fifth resistor (R5);

the 8 units of the neck position (4) are respectively combined through a first two-in-one power combiner (PWR 1) to a fourth two-in-one power combiner (PWR 4) to form 4 channels, the 4 channels are respectively connected with one ends of a thirty-ninth single-pole double-throw radio frequency switch (SW 39) to a forty-second single-pole double-throw radio frequency switch (SW 42), the other ends of the thirty-ninth single-pole double-throw radio frequency switch (SW 39) to the forty-second single-pole double-throw radio frequency switch (SW 42) are divided into two channels, and one channel is respectively grounded through a seventeenth resistor (R17) to a twentieth resistor (R20); the other path is respectively connected with a twenty-ninth single-pole double-throw radio frequency switch (SW 29) to a thirty-second single-pole double-throw radio frequency switch (SW 32);

6. A16-channel CoD-S coil apparatus for magnetic resonance imaging according to claim 4 or 5, wherein: the first single-pole double-throw radio frequency switch (SW 1) to the forty-second single-pole double-throw radio frequency switch (SW 42) are RFSW1012 of Qorvo corporation.