CN205193259U - A RF coil subassembly for magnetic resonance imaging - Google Patents

Abstract

The utility model discloses a radio frequency coil assembly for magnetic resonance imaging, which comprises: an insulating shell and several coil units wrapped inside the insulating shell; The insulating shell is provided with a notch penetrating in the front-rear direction, and the notch is a closed structure in the left-right direction and an open structure in one side in the up-down direction. The radio frequency coil assembly conforms to the shape of the neck of the human body, can fit the neck of the human body more effectively, and is suitable for a wider range of people.

Description

A radio frequency coil assembly for magnetic resonance imaging

【Technical field】

The utility model relates to magnetic resonance imaging technology, in particular to a radio frequency coil for magnetic resonance imaging.

【Background technique】

The basic principle of magnetic resonance imaging is: some atoms containing a single number of protons in human tissue, such as hydrogen atoms, can spin and generate magnetic moments, which can be regarded as some small magnets. Under normal conditions, the spin direction of these small magnets The arrangement is irregular, but under the action of a fixed static magnetic field, there will be a directional arrangement; at this time, when a radio frequency pulse with the same frequency as the static magnetic field is applied, these hydrogen atoms absorb a certain amount of energy and resonate, and the spin direction is under the action of the radio frequency pulse The deflection occurs and the arrangement is regular, that is, the phenomenon of magnetic resonance occurs; after the radio frequency pulse disappears, these hydrogen atoms will return to their original state. During the recovery process, energy is released and the spin direction is changed. The signals of the human body are sampled, and then the images of human tissues can be obtained by using these collected signals for image reconstruction. In the above process, the radio frequency coil is mainly used to transmit radio frequency pulses and collect magnetic resonance radio frequency signals.

The closer the radio frequency coil for collecting magnetic resonance signals is to the human tissue, the better the quality of the collected magnetic resonance signals and the higher the signal-to-noise ratio of imaging. Therefore, various local radio frequency coil components suitable for various parts of the human body have been designed, such as the head The coil assembly, the neck coil assembly, the ankle coil assembly, etc., the coil assembly is composed of multiple coils, and the multiple coils collect magnetic resonance signals in parallel. The above-mentioned coil assembly includes a plurality of independent radio frequency coil units, such as ring coils, saddle coils and the like.

Stroke has always been one of the main diseases causing human death. Medical research has shown that by performing carotid artery imaging and analyzing the carotid artery images, that is, analyzing the shape and composition of blood vessels, vessel walls, and dangerous lipid plaques, people who are at risk of stroke or who have already had a stroke can be diagnosed. The combined head and neck radio frequency coil device for magnetic resonance imaging system disclosed in Chinese Patent Application Publication No. CN101950006A includes a base, upper head coil and upper neck coil, and the upper head coil and upper neck coil are reserved by inserting the base The interface completes the cooperation of the entire set of head and neck joint coils. The neck coil of this structure surrounds the patient's neck during imaging, but its size cannot be adjusted, so there will be a certain distance from the patient's neck, especially for Patients with thinner necks will have greater distances, which will degrade the final image quality, and the structure is overall bulkier and more cumbersome to use. Therefore, it is necessary to provide an improved radio frequency coil assembly to overcome the defects in the prior art.

【Content of utility model】

The technical problem to be solved by the utility model is to provide a radio frequency coil assembly for magnetic resonance imaging, which can be conveniently used for magnetic resonance signal acquisition of scanned parts.

The technical solution adopted by the utility model to solve the above technical problems is: a radio frequency coil assembly for magnetic resonance imaging, including: an insulating shell, several coil units wrapped inside the insulating shell; the insulating shell is a The bent plate-shaped body extends along the left-right direction and the up-down direction respectively, and the insulating shell is provided with a gap penetrating in the front-rear direction, and the gap is a closed structure in the left-right direction, and one side is open in the up-down direction formula structure.

Preferably, the width of the notch decreases gradually along the up and down direction.

Preferably, the size of the insulating shell in the left-right direction is larger than the size of the insulating shell in the up-down direction.

Preferably, the length of the insulating shell is 250-350mm, the width is 60-90mm, and the thickness is 3-10mm.

Preferably, the inner edge of the notch is arc-shaped.

Preferably, the coil unit includes two groups of coil units, each group of coil units includes two loop coil units and a saddle-shaped coil unit, the two loop coil units are arranged overlappingly, and the saddle-shaped coil unit straddles the Two loop coil units; the two groups of coil units are symmetrically arranged on the center line in the left and right directions of the notch.

Preferably, the two loop coil units include lead ends arranged alternately, and the lead ends are located inside half of the coil units of the saddle coil unit; the lead ends of the saddle coil unit are located inside one loop coil unit.

Preferably, straps are further provided at both ends of the insulating shell, and a bonding structure is provided on the straps.

Preferably, the insulating shell is made of flexible material and can be bent into a shape suitable for the neck of the object to be scanned, and the notch is used to accommodate the front side of the neck of the object to be scanned.

Preferably, the radio frequency coil assembly further includes a cable assembly electrically connected to the coil unit, and the cable outlet end of the cable assembly is arranged obliquely relative to the insulating shell.

Compared with the prior art, the utility model has the following beneficial effects: the radio frequency coil assembly can fit the neck of the human body more effectively according to the shape of the neck of the human body, and is suitable for a wider range of people; the materials used are comfortable, light and easy to move; the use of straps Auxiliary to fix the coil, the coil assembly fixing operation is simple.

【Description of drawings】

1 is a three-dimensional combined view of a radio frequency coil assembly for magnetic resonance imaging according to an embodiment of the present invention;

Fig. 2 is the view of another angle of Fig. 1;

Fig. 3 is a schematic diagram showing that the radio frequency coil is bent into a shape suitable for the neck of the object to be scanned;

Fig. 4 is the three-dimensional assembled figure of radio frequency coil;

Fig. 5 is another three-dimensional combination diagram of the radio frequency coil;

Fig. 6 is an exploded view of the radio frequency coil;

Fig. 7 is a layout diagram of a radio frequency coil unit.

【detailed description】

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

The radio frequency coil assembly for magnetic resonance imaging in the preferred embodiment of the utility model is used for carotid artery magnetic resonance imaging, but the utility model is not limited thereto, and the utility model can be used for magnetic resonance of other scanned parts.

Please refer to Figs. 1-7, a radio frequency coil assembly 100 for magnetic resonance imaging of the present invention includes an insulating casing 1 and several coil units 2 wrapped inside the insulating casing 1; the insulating casing 1 can be The bent plate-shaped body extends along the left-right direction and the up-down direction respectively, and the insulating shell 1 is provided with a gap 11 penetrating in the front-rear direction, and the gap 11 is a closed structure in the left-right direction, and is in the up-down direction. Open structure on one side. The closed structure in the left and right directions means that there are corresponding insulating shell parts on the left and right sides of the notch, so that the notch cannot directly communicate with the space outside the insulating shell in the left and right directions; the open structure on one side in the up and down direction is It means that the upper or lower side of the notch and the insulating shell can communicate with the space outside the insulating shell.

The size of the insulating case 1 in the left-right direction is larger than the size of the insulating case 1 in the up-down direction. The width (dimension in the left-right direction) of the notch 11 gradually decreases along the up-down direction. Preferably, the length L ₁ (dimension in the left-right direction) of the insulating shell is 250-350mm, the height L ₂ (dimension in the up-down direction) is 60-90mm, and the thickness (dimension in the front-rear direction) L ₃ is 3-10mm. It should be noted that the left-right direction, up-down direction, and front-back direction here are defined with reference to the patient. The insulating housing 1 can be formed by bonding two formed flexible boards 1a, 1b together or integrally formed by injection molding of a flexible material.

The coil units 2 are divided into two groups and arranged symmetrically about the center line C of the notch. Preferably, each set of coil units includes two loop coil units 21, 22 and a saddle coil unit 23, the two loop coil units 21, 22 are arranged overlappingly, and the saddle coil unit 23 straddles the two loop coil units. Loop coil units 21 , 22 . The lead ends 211, 221 of the two toroidal coil units 21, 22 are arranged alternately, and the lead ends 211, 221 are located inside the half coil unit of the saddle coil unit 23; the lead ends 231 of the saddle coil unit 23 are located in the toroidal coil unit 21 internal.

The insulating shell 1 can be made of flexible materials such as EVA, and can be bent into a shape suitable for the neck of the object to be scanned. The notch 11 is used to accommodate the front side of the neck of the object to be scanned. Both ends of the insulating shell 1 are further provided with straps 12, and the straps 12 are provided with a bonding structure 121, such as a Velcro. When the insulating shell 1 matches the shape of the neck, the insulating shell 1 can be attached to Fix it to the neck to prevent it from loosening.

The radio frequency coil assembly 100 further includes a cable assembly 3 electrically connected to the coil unit 2 for sending control signals to the coil unit 2 or receiving magnetic resonance signals from the coil unit 2 . In addition, the signal can also be transmitted wirelessly.

The cable assembly 3 includes a cable 31 , a wave limiter 32 , a transition box 33 and a connector 34 connected to the end of the cable. In addition, the wave limiter 32 is arranged at a certain angle with the insulating case 1 , so that the outlet end of the cable 31 is arranged obliquely relative to the insulating case 1 . The transition box 33 is mainly used for connecting with the hospital bed, and it is connected with the coil unit 2 through the cable 31 . The circuit board inside the adapter box completes the signal amplification function. This circuit board can amplify the signal collected from the carotid artery for easy imaging.

The carotid artery coil in the utility model mainly has the following advantages: the radio frequency coil assembly follows the shape of the neck of the human body, can fit the neck of the human body more effectively, and is suitable for a wider range of people; the materials used are comfortable, light and handy and easy to move; The strap assists in fixing the coil, and the fixing operation of the coil assembly is simple.

Although the present utility model has been disclosed above with preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art may make some modifications and improvements without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be defined by the claims.

Claims (10)

1. A radio frequency coil assembly for magnetic resonance imaging, characterized in that it comprises: an insulating shell, several coil units wrapped inside the insulating shell; The insulation shell is provided with a notch penetrating in the front-rear direction, and the notch is a closed structure in the left-right direction and an open structure on one side in the up-down direction. 2 . The radio frequency coil assembly for magnetic resonance imaging according to claim 1 , wherein the width of the notch gradually decreases along the vertical direction. 3 . 3 . The radio frequency coil assembly for magnetic resonance imaging according to claim 1 , wherein the size of the insulating shell in the left-right direction is larger than the size of the insulating shell in the up-down direction. 4 . 4 . The radio frequency coil assembly for magnetic resonance imaging according to claim 1 , wherein the insulating shell has a length of 250-350 mm, a width of 60-90 mm, and a thickness of 3-10 mm. 5. The radio frequency coil assembly for magnetic resonance imaging according to claim 1, wherein the shape of the inner edge of the notch is arc. 6. The radio frequency coil assembly for magnetic resonance imaging according to claim 1, wherein the coil unit comprises two groups of coil units, and each group of coil units comprises two loop coil units and a saddle coil unit, The two loop coil units are arranged overlappingly, and the saddle-shaped coil unit straddles the two loop coil units; the two groups of coil units are symmetrically arranged on the center line in the left-right direction of the notch. 7. The radio frequency coil assembly for magnetic resonance imaging according to claim 6, wherein the two loop coil units include lead ends arranged in a staggered manner, and the lead ends are located in half of the coil unit of the saddle-shaped coil unit Internal; the leads of the saddle coil unit are located inside a toroidal coil unit. 8 . The radio frequency coil assembly for magnetic resonance imaging according to claim 1 , wherein straps are further provided at both ends of the insulating shell, and a bonding structure is provided on the straps. 9. The radio frequency coil assembly for magnetic resonance imaging according to claim 1, wherein the insulating shell is made of flexible material and can be bent into a shape suitable for the neck of the object to be scanned , and the notch is used to accommodate the front side of the neck of the scanned object. 10. The radio frequency coil assembly for magnetic resonance imaging according to claim 1, characterized in that, the radio frequency coil assembly further comprises a cable assembly electrically connected to the coil unit, and the cable of the cable assembly goes out The end is arranged obliquely relative to the insulating shell.