CN212083641U - Magnetic resonance radio frequency array coil device for breast imaging - Google Patents
Magnetic resonance radio frequency array coil device for breast imaging Download PDFInfo
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- CN212083641U CN212083641U CN202020416739.1U CN202020416739U CN212083641U CN 212083641 U CN212083641 U CN 212083641U CN 202020416739 U CN202020416739 U CN 202020416739U CN 212083641 U CN212083641 U CN 212083641U
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Abstract
The application discloses a magnetic resonance radio frequency array coil device for mammary gland imaging, including coil support shell and a plurality of coil unit, the coil support shell includes rear shell wall and front shell wall, breast holding chamber forms between rear shell wall and front shell wall, the breast stretches into the hole and link up and sets up on the rear shell wall, a ring type coil unit has all been arranged around in the periphery of every breast stretch into the hole, be equipped with two at least saddle type coil unit in the front shell wall, the left ring body and the right ring body of every saddle type coil unit all partially or all fall into inside a corresponding ring type coil unit in the projection of front and back direction. The decoupling performance between the coil units can be improved, and the magnetic resonance imaging quality is optimized.
Description
Technical Field
The present application relates to a magnetic resonance radio frequency array coil apparatus for breast imaging.
Background
A magnetic resonance system is a medical imaging apparatus in which a Radio Frequency (RF) receive coil is a very important component of the magnetic resonance system. The effect of the radio frequency receive coil in this is comparable to that of the adult eye, with the resulting sharpness of the image being directly proportional to its signal-to-noise ratio (sensitivity). To improve the image clarity (or signal-to-noise ratio, or sensitivity), the primary starting point for a typical coil design is to determine the shape and lumen size of the coil, which cannot be too small or too small. Because if the coil size is too large, the sharpness of the magnetic resonance image is reduced; and too small, there may be a significant proportion of the specific part of the patient that cannot be placed inside the coil. The primary principle of coil design is to make the coil as close as possible to the scanning site or object, while meeting the size of the scanning site or object. For example, a head coil is designed with dimensions that allow the head of most patients (e.g., over 95% of patients) to be placed within the coil.
Thus, the radio frequency receive coils may be named variously according to the name of the scanning site or subject. When different parts of a human body are scanned, special coils are generally needed to obtain the best image effect, for example, a coil for scanning a head is called a head coil, a coil for scanning a knee joint is called a knee joint coil, a coil for scanning a female breast is called a breast coil or a breast coil, and the special breast coil is adopted to greatly improve the performance of breast clinical images. As described above, in order to improve the image performance of the breast, it is necessary to design the coil so that the female breast is placed inside the coil and the coil is sized to be as close to the breast as possible.
Magnetic resonance navigator intervention (Interventional MR) is a completely new concept and is now in an early stage of development. Magnetic resonance interventions require special techniques and open radio frequency coils. The operation method of magnetic resonance intervention is similar to the intervention operation method under the guidance of a corresponding X-ray machine or CT machine. And because of the advantage of magnetic resonance imaging, the intervention operation process is more accurate and reliable, and even the operation work which can not be performed under the guidance of an X-ray machine, ultrasound and a CT machine can be performed.
At present, the conventional magnetic resonance mammary gland coil is mainly used for clinical image examination and is not suitable for the interventional operation of mammary glands, because the conventional mammary gland coil shell is usually of a closed design and does not have a structure for performing operation windowing. In order to implement the mammary gland navigation operation, a windowing structure convenient for the operation is also manufactured on the mammary gland coil shell.
Factors such as conductor distribution, direction, shape and number of each coil unit of the mammary gland coil directly influence the performance of the magnetic resonance image. In order to improve the imaging performance of the coil, the radio frequency coil needs to be designed into a multi-channel array coil, namely, a plurality of independent radio frequency receiving elements are arranged.
The coupling between the multi-channel coil units is an unavoidable problem, and the optimal mode for decoupling between adjacent units is partial overlapping (Overlap), that is, a part of the area between 2 adjacent units is overlapped and shared. However, partial coincidence decoupling may not be used between all coil units, because coincidence decoupling firstly requires that two coil units are positioned adjacent to each other, and secondly also requires that the coincidence area has a quantitative requirement. The condition described above does not necessarily exist between two coil units, such as two coil units on opposite sides in a breast coil.
Disclosure of Invention
The purpose of the application is: in view of the above problems, a magnetic resonance radio frequency array coil device for breast imaging is proposed, which aims to improve the decoupling between coil units and optimize the magnetic resonance imaging quality.
The technical scheme of the application is as follows:
a magnetic resonance radio frequency array coil device for breast imaging comprises a plurality of coil units and a coil supporting shell for supporting the coil units, wherein a breast accommodating cavity for accommodating the breast of a checked person is formed in the coil supporting shell;
the coil supporting shell comprises a rear side shell wall attached to a person to be examined in an imaging examination and a front side shell wall far away from the person to be examined, the breast accommodating cavity is formed between the rear side shell wall and the front side shell wall, the rear side shell wall is provided with two breast inserting holes communicated with the breast accommodating cavity for allowing breasts of the person to be examined to be inserted into the breast accommodating cavity, the front side shell wall is provided with operation holes communicated with the breast accommodating cavity, the periphery of each breast inserting hole is provided with a ring-shaped coil unit in a surrounding mode, at least two saddle-shaped coil units are arranged in the front side shell wall, and the projections of a left ring body and a right ring body of each saddle-shaped coil unit in the front-back direction partially or completely fall into the corresponding ring-shaped coil unit.
On the basis of the technical scheme, the application also comprises the following preferable scheme:
the left ring body of the saddle-shaped coil unit and the right ring body of the saddle-shaped coil unit are symmetrically arranged, and the projection overlapping area of the left ring body of the saddle-shaped coil unit and the projection overlapping area of the ring-shaped coil unit in the front-back direction are equal to the projection overlapping area of the right ring body of the saddle-shaped coil unit and the projection overlapping area of the ring-shaped coil unit in the front-back direction.
The saddle-shaped coil units are at least four, wherein two saddle-shaped coil units project into one ring-shaped coil unit in the front-back direction, and the other two saddle-shaped coil units project into the other ring-shaped coil unit.
Two adjacent saddle coil units partially overlap to decouple.
Two operation holes are arranged and are distributed at intervals from left to right, and the two breast extending holes are positioned between the two operation holes.
The two operation holes are coaxially arranged, the hole axes of the two breast extending holes are arranged in parallel, and the hole axes of the operation holes are arranged perpendicular to the hole axes of the breast extending holes.
And a ring-shaped coil unit is arranged around the periphery of each operation hole.
The ring-type coil unit at the periphery of the operation hole is partially overlapped with the adjacent saddle-type coil unit for decoupling.
Two of the breast access holes are arranged at a left-right interval, and a support beam on the rear-side shell wall is formed between the two breast access holes.
The application has the advantages that:
1. a loop-type coil unit is arranged around the periphery of each breast access hole, so that the imaging quality of the array of coils is improved. A saddle-shaped coil unit which is arranged opposite to a loop coil unit at the periphery of a breast extending hole is arranged in the shell wall of the front side of the coil supporting shell, and the saddle-shaped coil unit and the loop coil unit are naturally and slightly coupled or even not coupled, so that the mammary gland magnetic resonance imaging quality is further improved.
2. The wall of the coil supporting shell is provided with an operation hole communicated with the breast accommodating cavity. In practical application, the device can be used for carrying out magnetic resonance imaging examination on the mammary gland of a patient, and meanwhile, the operation equipment extends into the breast accommodating cavity from the operation hole to carry out operation on the mammary gland of the patient, so that the mammary gland navigation operation is carried out. Moreover, a splint can be added through the operation hole to fix the breast and prevent the breast from vibrating.
3. The two operation holes are arranged in total, the two operation holes are arranged coaxially, the hole axes of the two breast extending holes are arranged in parallel, and the hole axes of the operation holes are arranged perpendicular to the hole axes of the breast extending holes. Therefore, the two coaxially arranged operation holes and the breast accommodating cavity inside form a channel penetrating through the coil supporting shell together, if a breast on one side is found to have a focus, the breast on the other side is only required to be tightly tied on the breast to enable the breast to be incapable of drooping, so that the breast with the focus can be subjected to imaging examination even if a patient is still on the coil, and operation measures can be taken on the focus breast in any one of the left direction and the right direction through the left operation hole and the right operation hole, so that accurate implementation of imaging and operation is ensured.
4. The periphery of the operation hole is also surrounded by a ring-shaped coil unit, so that the imaging performance of the coil array is further improved.
5. The rear side shell wall of the coil supporting shell is provided with two breast extending holes which are distributed at intervals from left to right, and a supporting beam positioned on the rear side shell wall is formed between the two breast extending holes, so that the supporting beam can support a patient in a prone position, reduce the discomfort of the patient, and can be used as a fixing medium of two loop coil units, thereby increasing the space flexibility of unit design.
6. If the left ring body and the right ring body of the saddle-shaped coil unit are symmetrical in structure, and the overlapping area of the left ring body and the ring-shaped coil unit is equal to that of the right ring body and the ring-shaped coil unit, the coupling between the saddle-shaped coil unit and the corresponding ring-shaped coil unit is more favorably close to zero.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the description of the embodiments are briefly introduced below, the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of an mri coil apparatus according to an embodiment of the present application;
fig. 2 is a schematic diagram illustrating a distribution structure of coil units in an mri coil apparatus according to an embodiment of the present application;
FIG. 3 is an exploded view of coil units of an MRI coil apparatus according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a distribution structure of coil units on a coil supporting case in a second mri array coil apparatus according to an embodiment of the present application;
FIG. 5 is an exploded view of a coil unit of a second MRI RF array coil apparatus according to an embodiment of the present invention;
FIG. 6 is a diagram illustrating a distribution structure of coil units in a three-MR RF array coil apparatus according to an embodiment of the present invention;
FIG. 7 is an exploded view of a coil unit of a three-MR RF array coil apparatus according to an embodiment of the present application;
fig. 8 is a schematic view showing a structure of a typical saddle-type coil unit.
Wherein: 1-coil support shell, 2-loop coil unit, 3-saddle coil unit, 101-back shell wall, 102-front shell wall, 103-breast receiving chamber, 101 a-breast access hole, 101 b-support beam, 102 a-operation hole.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and reference is made to the figures for the front and rear in the various embodiments.
One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.
Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.
The first embodiment is as follows:
fig. 1 to 3 show a preferred embodiment of the magnetic resonance radio frequency array coil apparatus for breast imaging according to the present application, which also includes a plurality of coil units and a coil support case 1 supporting the coil units, as in the conventional structure. A breast accommodating cavity 103 for accommodating the breast of the examinee is formed in the coil supporting shell 1, and a breast insertion hole 101a which is communicated with the breast accommodating cavity and used for inserting the breast of the examinee into the breast accommodating cavity is formed in the shell wall of the coil supporting shell 1.
In this embodiment, the wall of the coil supporting housing 1 is further provided with an operation hole 102a communicating with the breast accommodating cavity. In practical application, when the device is used for magnetic resonance imaging examination of the breast of a patient, the operation equipment extends into the breast accommodating cavity 103 from the operation hole 102a to perform an operation on the breast of the patient, so that a breast navigation operation is performed. Furthermore, a splint can be added through the operation hole 102a to fix the breast and prevent the breast from vibrating.
If the wall of the coil support case 1 is divided into a rear side case wall 101 and a front side case wall 102 which are connected to each other in such a manner that the wall is separated from the examinee at the time of imaging examination, the rear side case wall 101 abuts against the examinee at the time of imaging examination, and the front side case wall 102 is separated from the examinee (located on the front side of the rear side case wall 101). The breast accommodating chamber 103 is formed between the rear casing wall 101 and the front casing wall 102, the breast insertion hole 101a is formed through the rear casing wall 101, and the operation hole 102a is formed through the front casing wall 102.
The examinee generally has two breasts, and if the above-mentioned breast insertion hole 101a is provided only one for the two breasts of the examinee to be inserted, the size of the breast insertion hole 101a must be made large, which not only lowers the structural strength of the coil support case 1 but also does not facilitate the mounting arrangement of the coil unit in the housing wall. In this embodiment, a total of two breast insertion holes 101a are formed in the rear casing wall 101, and the two breast insertion holes 101a are distributed at intervals from left to right, and are respectively used for the left and right breasts of the subject to be examined to insert. And a support beam 101b on the rear-side casing wall 101 is formed between the two breast-inserting holes 101a, and the support beam 101b can support the patient in the prone position to reduce the discomfort of the patient, and can also be used as a fixing medium of the coil unit (described in detail below), thereby increasing the spatial flexibility of the unit design.
If only one operation hole 102a is provided, it is difficult to perform both left and right breast operations on the patient. In this regard, in the present embodiment, a total of two operation holes 102a are formed in the front side housing wall 102 of the coil support housing, the two operation holes 102a are arranged to be spaced apart from each other on the left and right sides, and the two breast projecting holes 101a are located between the two operation holes 102 a. Thus, the left hand operation hole 102a is mainly used for the surgical operation of the left breast of the patient, and the right hand operation hole 102a is mainly used for the surgical operation of the right breast of the patient.
To further facilitate the implementation of breast surgery, the present embodiment arranges the two operation holes 102a substantially coaxially, arranges the hole axes of the two breast insertion holes 101a substantially in parallel, and arranges the hole axes of the operation holes 102a substantially perpendicular to the hole axes of the breast insertion holes 101 a. The two coaxially arranged operation holes 102a and the inner breast accommodating cavity 103 form a channel penetrating through the coil supporting shell 1 together, if a breast on one side is found to have a focus, the breast on the other side is only required to be tightly tied on the breast to enable the breast not to droop in the specific process of examination and operation, so that the breast with the focus can be imaged and examined even if a patient still lies prone on the coil, and operation measures can be taken on the focus breast in any one of the left direction and the right direction through the left operation hole 102a and the right operation hole 102a, thereby ensuring the accurate implementation of imaging and operation.
After the design of the mammary gland coil supporting shell is determined, factors such as conductor distribution, trend, shape and number of the coil units directly influence the performance of the magnetic resonance image. In order to improve the imaging performance of the coil, the radio frequency coil needs to be designed into a multi-channel array coil, namely, a plurality of independent radio frequency receiving elements, namely a plurality of coil units.
Considering that the present embodiment has two breast-inserting holes 101a formed in the coil support case 1, and therefore many possible directions of the coil units are cut off by the holes, in order to improve the imaging performance of the coil, the present embodiment has a ring-shaped coil unit 2 disposed around the periphery of each breast-inserting hole 101 a.
The coupling between the multi-channel coil units is an unavoidable problem, and the optimal mode for decoupling between the adjacent coil units is partial overlapping (Overlap), that is, a part of the area between two adjacent coil units is overlapped and shared. For example, the two loop coil units 2 respectively located at the periphery of the two breast access holes 101a in this embodiment are decoupled in such a way that the two loop coil units 2 are partially overlapped (Overlap), and the overlapped portion of the two loop coil units is disposed in the support beam 101 b. However, partial Overlap (Overlap) decoupling may not be used between all coil units, since Overlap decoupling firstly requires that two coil units are positioned adjacent to each other, secondly the Overlap area also has a quantitative requirement, and not both coil units have this condition.
We have found that there is a natural decoupling between the two coil units, namely the use of a loop coil unit for one unit and a saddle coil unit for the other. The saddle-shaped coil unit is similar to a 8 shape in appearance, and as shown in fig. 8, two coil sections of the saddle-shaped coil unit in the 8 shape at the intersection (namely two coil sections which are crossed in an x shape at the middle part of the 8 shape) are arranged in an insulated manner. That is, the saddle coil unit corresponds to an 8-shaped closed loop structure. For convenience of description, we can divide the saddle-type coil unit 3 into a left loop and a right loop with its intersection as a boundary.
The loop coil unit and the saddle coil unit are oppositely arranged, so that the magnetic flux generated by the loop coil unit is opposite between the two half sides of the saddle coil unit, and the induced electromotive force generated on the saddle coil unit is extremely small or even zero. The left ring body and the right ring body on the two half sides of the saddle-shaped coil unit generate opposite magnetic flux directions, and the induced electromotive force generated on the ring-shaped coil unit is very small or even zero. There is naturally little or no coupling between the two coil units.
In this respect, the present embodiment provides two saddle-shaped coil units 3 in the front side housing wall 101 of the coil support housing 1. The two saddle coil units 3 are respectively arranged opposite to the two loop coil units 2, and the projected area of each loop coil unit 2 in the front-rear direction is partially overlapped with the projected area of the corresponding saddle coil unit 3 in the front-rear direction (the two coil units are different in shape and cannot be completely overlapped).
And the two saddle coil units 3 are partially overlapped (Overlap) to be decoupled.
Further, the left and right loops of each saddle-shaped coil unit 3 are projected in the front-rear direction all within the corresponding one of the loop-shaped coil units 2. That is, the front-rear projection of each saddle coil unit 3 is entirely within the corresponding ring coil unit 2.
Of course, the projections of the left and right loops of the saddle coil unit 2 in the front-rear direction do not necessarily fall completely inside the corresponding loop coil unit 2, but may partially fall inside the corresponding loop coil unit 2, which also has a magnetic flux canceling effect.
When the saddle-shaped coil unit is arranged, the left ring body and the right ring body are preferably guaranteed to be structurally symmetrical, and the overlapping area of the left ring body and the ring-shaped coil unit is equal to that of the right ring body and the ring-shaped coil unit, so that the coupling between the saddle-shaped coil unit and the corresponding ring-shaped coil unit is more favorably close to zero.
In the present embodiment, the projected overlapping area of each saddle coil unit 3 and the corresponding loop coil unit 2 in the front-rear direction is equal to the projected area of the saddle coil unit 3 itself in the front-rear direction. That is, the saddle-type coil unit 3 completely falls inside the ring-type coil unit 2 as viewed in the front-rear direction. In other words, each saddle coil unit 3 is projected inside the corresponding ring coil unit 2 in the front-rear direction.
It can be seen that the coil device of the present embodiment is provided with four coil units (four channels) in total, two ring-type coil units and two saddle-type coil units, respectively, and the two ring-type coil units are respectively arranged around the peripheries of the two breast-insertion holes 101 a.
Example two:
fig. 4 to 6 show a second preferred embodiment of the magnetic resonance radio frequency array coil apparatus for breast imaging according to the present application, which has substantially the same structure as the first embodiment except that:
in the present embodiment, a total of four saddle-type coil units 3 are provided in the front-side casing wall 101 of the coil support case 1, two of the saddle-type coil units 3 being projected in the front-rear direction inside one ring-type coil unit 2, and the other two saddle-type coil units 3 being projected in the front-rear direction inside the other ring-type coil unit 2.
It can be seen that the coil device of the present embodiment is provided with six coil units (six channels) in total, two ring-type coil units and four saddle-type coil units, respectively, and the two ring-type coil units are arranged around the peripheries of the two breast-insertion holes 101a, respectively.
Example three:
fig. 4 to 6 show a third preferred embodiment of the magnetic resonance radio frequency array coil device for breast imaging, which is basically the same as the second embodiment except that:
the periphery of each operation hole 102a is also surrounded by one loop type coil unit 2. And the loop type coil unit 2 at the periphery of the operation hole 102a partially overlaps (Overlap) with the loop type coil unit 2 at the periphery of the adjacent breast insertion hole 101a to be decoupled.
It can be seen that the coil device of the present embodiment is provided with eight coil units (eight channels) in total, four loop coil units and four saddle coil units, respectively. Two of the loop-type coil units are respectively arranged around the periphery of the two breast access holes 101a, and the other two loop-type coil units are respectively arranged around the periphery of the two operation holes 102 a.
The above embodiments are only for illustrating the technical concepts and features of the present application, and the purpose of the embodiments is to enable people to understand the content of the present application and implement the present application, and not to limit the protection scope of the present application. All equivalent changes and modifications made according to the spirit of the main technical scheme of the application are covered in the protection scope of the application.
Claims (9)
1. A magnetic resonance radio frequency array coil device for breast imaging comprises a plurality of coil units and a coil supporting shell (1) for supporting the coil units, wherein a breast accommodating cavity (103) for accommodating the breast of a checked person is formed in the coil supporting shell (1);
characterized in that the coil supporting shell (1) comprises a rear side shell wall (101) which is close to a person to be examined during imaging examination and a front side shell wall (102) which is far away from the person to be examined, the breast accommodating cavity (103) is formed between the rear side shell wall (101) and the front side shell wall (102), the rear side shell wall (101) is provided with two breast inserting holes (101a) which are communicated with the breast accommodating cavity and used for inserting the breasts of the person to be examined into the breast accommodating cavity, the front side shell wall (102) is provided with an operating hole (102a) which is communicated with the breast accommodating cavity (103), the periphery of each breast inserting hole (101a) is provided with a ring-shaped coil unit (2) in a surrounding way, at least two saddle-shaped coil units (3) are arranged in the front side shell wall (102), and the projection parts or all parts of the left ring body and the right ring body of each saddle-shaped coil unit (3) in the front-back direction are positioned on one corresponding ring-shaped coil unit (2) (2) Inside.
2. The magnetic resonance radio frequency array coil device for breast imaging according to claim 1, wherein the left loop of the saddle coil unit (3) and the right loop of the saddle coil unit (3) are symmetrically arranged, and the projected overlapping area of the left loop of the saddle coil unit (3) and the projected overlapping area of the loop coil unit (2) in the front-back direction is equal to the projected overlapping area of the right loop of the saddle coil unit (3) and the projected overlapping area of the loop coil unit (2) in the front-back direction.
3. The magnetic resonance radio frequency array coil apparatus for breast imaging according to claim 1, wherein the saddle coil units (3) are provided in at least four, two of the saddle coil units (3) are projected inside one ring coil unit (2) in the front-back direction, and the other two saddle coil units (3) are projected inside the other ring coil unit (2) in the front-back direction.
4. A magnetic resonance radio frequency array coil apparatus for breast imaging according to claim 1 or 2 or 3, characterized in that adjacent two saddle coil units (3) partially coincide for decoupling.
5. The magnetic resonance radio frequency array coil apparatus for breast imaging as set forth in claim 1, wherein the two operation holes (102a) are provided, and the two operation holes (102a) are arranged at a left-right interval, and the two breast access holes (101a) are located between the two operation holes (102 a).
6. The magnetic resonance radio frequency array coil apparatus for breast imaging according to claim 5, wherein the two operation holes (102a) are coaxially arranged, the hole axes of the two breast access holes (101a) are arranged in parallel, and the hole axes of the operation holes (102a) are arranged perpendicular to the hole axes of the breast access holes (101 a).
7. The magnetic resonance radio frequency array coil apparatus for breast imaging as set forth in claim 6, wherein one loop type coil unit (2) is disposed around the periphery of each of the operation holes (102 a).
8. The magnetic resonance radio frequency array coil apparatus for breast imaging according to claim 7, wherein the loop type coil unit (2) at the periphery of the operation hole (102a) partially coincides with the adjacent saddle type coil unit (3) for decoupling.
9. The magnetic resonance radio frequency array coil apparatus for breast imaging as set forth in claim 7, wherein two of the breast access holes (101a) are spaced apart from each other on the left and right sides, and a support beam (101b) on the rear-side shell wall (101) is formed between the two breast access holes.
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| CN113253171A (en) * | 2021-05-08 | 2021-08-13 | 苏州众志医疗科技有限公司 | Radio frequency coil device for magnetic resonance breast imaging |
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| CN113253171A (en) * | 2021-05-08 | 2021-08-13 | 苏州众志医疗科技有限公司 | Radio frequency coil device for magnetic resonance breast imaging |
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