CN213041982U

CN213041982U - Local coil device and magnetic resonance tomography apparatus

Info

Publication number: CN213041982U
Application number: CN202021025166.6U
Authority: CN
Inventors: 陈燕红; 佟瞳
Original assignee: Siemens Shenzhen Magnetic Resonance Ltd
Current assignee: Siemens Shenzhen Magnetic Resonance Ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-04-23
Anticipated expiration: 2030-06-05

Abstract

The present disclosure relates to a local coil device and a magnetic resonance tomography apparatus for magnetic resonance tomography of a breast region. The local coil device includes: the supporting unit comprises a supporting shell, the supporting shell is provided with a supporting surface for supporting the prone position of a patient and a mounting part which is arranged on the supporting surface and used for mounting a coil unit group; the coil unit group is detachably arranged on the supporting unit through matching with the mounting part; the coil unit group includes: at least one first radio frequency surface coil, a closed loop of the first radio frequency surface coil being capable of surrounding a breast of a patient; a first opening is formed in the support shell to form an accommodating space for accommodating the breast, so that the breast can be imaged at the accommodating space after passing through the area enclosed by the first radio frequency surface coil. The coil unit group is closer to the mammary gland part and the surrounding tissues, better image quality and signal-to-noise ratio are obtained, and the method has wider applicability.

Description

Local coil device and magnetic resonance tomography apparatus

Technical Field

The utility model relates to the technical field of medical equipment, in particular to device of mammary gland magnetic resonance tomography examination.

Background

Commonly used examination methods of breast health include X-ray breast examination (breast molybdenum target), ultrasound examination, magnetic resonance tomography breast examination, and surgical biopsy. Breast magnetic resonance tomography examinations are more effective in the examined spatial range and sensitivity to multiple breast diseases than, for example, breast X-ray imaging. Unlike the usual mammography method, the breast does not have to be damaged by X-rays.

In magnetic resonance tomography devices, the body or body part to be examined is usually subjected to a defined basic magnetic field (often referred to as B) by means of a basic magnetic field system₀Field). Additionally, magnetic field gradients are applied by means of a basic gradient system. A high-frequency magnetic resonance excitation signal (HF signal) having a defined field strength is transmitted via a high-frequency transmission system and then by means of a suitable antenna. The transmission of the high-frequency signals for the magnetization of the nuclear spins is usually carried out using a so-called "whole-body coil" or "body coil" which is fixedly embedded in the magnetic resonance tomography apparatus, for example a Birdcage antenna (Birdcage antenna). The whole-body coil encloses a measurement space, often also referred to as "patient tunnel", in which the patient is positioned during the examination. The magnetic flux density of the excitation field is generally B₁The high-frequency field representing and pulse-shaped is correspondingly also referred to as B for short₁A field. The rf pulses cause the nuclear spins of the particular atoms resonantly excited by the B1 field to rotate at a defined flip angle. Upon relaxation of the nuclear spins, high-frequency signals, so-called magnetic resonance signals, are radiated again. The accurate stereo image of the inside of the human tissue is obtained by receiving the magnetic resonance signal by the receiver/coil and reconstructing and processing the magnetic resonance signal by using a computer image reconstruction algorithm.

SUMMERY OF THE UTILITY MODEL

In view of this, the present disclosure proposes a local coil device for magnetic resonance tomography of a breast region. The local coil device includes: the supporting unit is provided with a supporting surface for supporting the prone position of a patient and a mounting part which is arranged on the supporting surface and used for mounting a coil unit group; a coil unit group detachably mounted to the support unit through the mounting part; the coil unit group includes: at least one first radio frequency surface coil, the closed loop of the first radio frequency surface coil being capable of surrounding the patient's breast; and arranging a first opening on the support shell at a position corresponding to the first radio frequency surface coil to construct an accommodating space for accommodating the breast, so that the breast is imaged at the accommodating space after passing through the area enclosed by the first radio frequency surface coil.

Optionally, the local coil device further comprises: and the coil shell is used for installing the radio frequency surface coil group in the coil shell, wherein a second opening is formed in the position, where the first radio frequency surface coil is located, of the coil shell, so that the breast can enter the area surrounded by the first radio frequency surface coil through the second opening.

Optionally, the mounting portion of the local coil device is provided with an accommodating space for mounting the coil housing to accommodate the coil housing; and the mounting part is provided with a groove, and the coil shell is provided with a protruding part at the corresponding position of the groove, so that the coil shell can be mounted on the supporting unit in a matched manner by accommodating the protruding part in the groove, and the protruding part can be separated from the groove under the action of external force, thereby realizing that the coil unit group is detachably mounted on the supporting unit.

Optionally, the coil unit group further includes: and the second radio frequency surface coil and the first radio frequency surface coil are adjacently arranged on the same plane, so that the coil unit group forms a multi-channel radio frequency surface coil group which is laid along the first radio frequency surface coil to the periphery.

Optionally, the first and second radio frequency surface coils of the local coil arrangement are flexible coils.

Optionally, the coil unit group of the local coil device comprises: a pair of first RF surface coils disposed side-by-side, adjacent ones of the first RF surface coils overlapping at an edge, the first RF surface coils being capable of being disposed around respective ones of the breasts; a plurality of second radio frequency surface coils adjacently disposed along the first radio frequency surface coil and overlapping edges adjacent to the first radio frequency surface coil, and edges between adjacent second radio frequency surface coils overlap.

Optionally, the ratio of the widths of the first and second radio frequency surface coils of a local coil arrangement is 3: and 2, one side of the pair of first radio frequency surface coils arranged side by side is adjacent to three second radio frequency surface coils arranged side by side, the other side of the pair of first radio frequency surface coils arranged side by side is adjacent to the other three second radio frequency surface coils arranged side by side, and therefore the second radio frequency surface coils and the first radio frequency surface coils are constructed into an 8-channel radio frequency surface coil group.

Optionally, the local coil device further comprises: the cushion unit can be arranged on the coil unit group, and a third opening is formed in the cushion unit, so that the breast can be surrounded by the first radio frequency surface coil after passing through the third opening.

Another aspect of the disclosure proposes a magnetic resonance tomography apparatus comprising a local coil as described above.

One advantage of the present disclosure is that the local coil device, in addition to providing an opening capable of allowing the breast to pass through at the position of the first rf surface coil, enables the breast of the patient to be imaged in a defined accommodating space, and the local coil device includes a coil unit set, in which the first rf coil and the second rf coil are laid along a plane, so that the multi-channel rf surface coil set of the coil unit set can function as a spine coil or an abdomen coil, and can function as a dedicated breast coil when the coil unit set is used with the supporting unit. The manufacturing cost of the coil unit group is low, and the use frequency of the coil unit group is increased, so that the magnetic resonance tomography technology can be widely applied to the examination of the breast health.

Another advantage of the present disclosure is that the supporting unit of the local coil device is provided with a groove for installing the coil housing where the coil unit set is located, the groove has a profile capable of accommodating the coil housing, so that the coil unit set can be detachably installed on the supporting unit through the cooperation between the coil housing and the groove, and thus the coil unit set can be used as a local coil for magnetic resonance tomography of breast when being used in cooperation with the supporting unit, and can be used as a common local coil after being detached and separated from the coil unit set.

Another advantage of the present disclosure is that the coil housing of the local coil device is provided with a second opening at a position of the first rf surface coil for allowing the breast of the patient to pass through, and a first opening corresponding to the second opening is provided on the support housing for accommodating the breast of the patient, so that when the coil housing is correspondingly installed and the support unit is installed, the breast of the patient is imaged through a space defined between the first opening and the second opening, so that the coil unit group is closer to the periphery of the tissue of the breast, and better image quality and signal-to-noise ratio are obtained.

Drawings

The above and other features and advantages of the present invention will become more apparent to those of ordinary skill in the art by describing in detail embodiments thereof with reference to the attached drawings in which:

fig. 1 is an exploded view illustrating a local coil device according to an exemplary embodiment;

fig. 2 is an assembly view showing a local coil device according to an exemplary embodiment;

fig. 3 is a schematic diagram showing a patient lying prone to a local coil arrangement according to an exemplary embodiment;

FIG. 4 is a schematic diagram illustrating a multi-channel radio frequency surface coil assembly in accordance with an exemplary embodiment;

FIG. 5 is a schematic diagram illustrating a coil housing mounted facing a support housing according to an exemplary embodiment;

fig. 6 is a schematic diagram showing a magnetic resonance tomography apparatus according to an exemplary embodiment.

Wherein the reference numbers are as follows:

1 magnetic resonance tomography apparatus

2-tomogrAN _ SNhy AN _ SNparatus/scanner

3 measurement volume/patient channel

4 patient couch

5 field coil system

6 HF transmitting antenna device

7 terminal

8 data bus

10 control device

11 measurement control unit

12 control interface

13 receiving interface

14 reconstruction device

15 terminal interface

16 network interface

17 memory

20 local coil arrangement

30 support unit

31 support housing

32 mounting part

33 first opening

34 groove

40 coil unit group

41 coil housing

42 first radio frequency surface coil

43 second radio frequency surface coil

44 second opening

45 projection

50 cushion unit

51 third opening

Detailed Description

In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals refer to like parts throughout.

"exemplary" means "serving as an example, instance, or illustration" herein, and any illustration, embodiment, or steps described as "exemplary" herein should not be construed as a preferred or advantageous alternative.

For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled.

In this document, "one" means not only "only one" but also a case of "more than one". In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree of importance and order thereof, and the premise that each other exists, and the like.

A magnetic resonance tomography system may receive magnetic resonance signals of local tissue of a body using a local coil. Local coils have a higher signal-to-noise ratio. This is essentially an antenna system mounted near the patient. The magnetic resonance signals induce a voltage in the respective antenna of the local coil, for which voltage they are then amplified by a low-noise preamplifier (LAN, Preamp) and finally transmitted to the receiving electronics. For different possibilities of use, special local coils are provided here, for example breast coils for checking the health of the female breast, which usually require specially designed high-resolution magnetic resonance tomography breast coils that can be fitted to the breast in order to show small lesions and fine structures of the breast. Breast coils typically have a coil housing, which typically has two breast recesses arranged side by side, which are generally circular in cross section, in which the breasts are accommodated. A plurality of coil elements with corresponding electronic components are usually arranged in the housing around the breast. However, it is expensive to make a special magnetic resonance breast coil. At the same time, compared to other local coils, such as: abdominal coil, spine coil, etc., which are used less frequently. This has led to the current use of magnetic resonance tomography to examine the health of the breast, which is not widely spread due to the high cost and low availability of specialized breast coils.

In some cases, when magnetic resonance tomography is performed using, for example, spine coils, abdominal coils, etc. instead of breast coils, the complicated arrangement and placement of the coils increases discomfort and scanning time for the prone patient. The local coil used for replacing the mammary gland coil is far away from the scanning part, the signal to noise ratio of the imaged part is low due to no coil is arranged around the focus, and the image quality is not ideal.

The present disclosure provides a local coil device, which is detachably and fixedly installed with a supporting unit through a coil unit set, and defines a space for accommodating a breast of a patient with the coil unit set and the supporting unit for imaging, so that the coil unit set can be closer to a breast tissue of the patient, and has better signal-to-noise ratio and image quality. In addition, the arrangement mode of the coil unit group can be suitable for shooting other parts of the patient, such as: spine, abdomen, etc. So that the coil unit set of the present disclosure can be used for other purposes when detached from the supporting unit. This increases the frequency of use and the range of coil unit group in the local coil device of this disclosure, has better popularization nature.

The local coil device of the present disclosure will be further described below with reference to the accompanying drawings.

As shown in fig. 1, a local coil device 20 for magnetic resonance tomography of a breast region of the present disclosure includes: the supporting unit 30 comprises a supporting shell 31, the supporting shell 31 is provided with a supporting surface for supporting the patient to lie on the stomach, and a mounting part 32 for mounting a coil unit group is arranged on the supporting surface. The coil unit group 40 is detachably attached to the support unit 30 by fitting to the attachment portion 32. The coil unit group 40 includes: at least one first radio frequency surface coil 42, the closed loop of the first radio frequency surface coil 42 being capable of surrounding a breast of the patient. A first opening 33 may be opened in the support housing 31 at a position corresponding to the first rf surface coil 42 to form an accommodating space for accommodating the breast of the patient, so that the breast of the patient can be imaged at the accommodating space after passing through the region surrounded by the first rf surface coil 42.

According to some embodiments, as shown in fig. 4, the coil unit group 40 further includes: the second RF surface coil 43 may be disposed adjacent to the first RF surface coil 42 in the same plane, and a multi-channel RF surface coil assembly is formed by the second RF surface coil 43 and the first RF surface coil 42. Additionally, the edges of the first radio frequency surface coil 42 may overlap with the edges of the adjacent second radio frequency surface coil 43 for decoupling. It should be noted that adjacent first rf surface coil 42 and second rf surface coil 43 are decoupled by the low noise amplifier by overlapping at the edges.

It should be noted that the breast of the patient P can pass through the region enclosed by the first rf surface coil 42 to ensure that the first rf surface coil 42 can fit to the focus of the breast of the patient, and the region enclosed by the first rf surface coil and the accommodating space of the supporting shell 31 together define a space for imaging, so as to obtain a higher signal-to-noise ratio and obtain a better image quality.

According to an illustrated embodiment, as shown in fig. 1 and 2, the mounting portion 32 may open directly onto the support surface to support the area enclosed by the first rf surface coil 42 mounted on the mounting portion 32 when the patient P is lying prone on the support surface. In addition, the support housing 31 may also generally have an angled slope to guide the patient P to lie prone on the support surface of the support housing 31.

It should be noted that the radio frequency surface coil is a common local coil in a magnetic resonance tomography apparatus to receive magnetic resonance signals of local tissues of a human body, and a multi-channel radio frequency surface coil set constructed by a plurality of radio frequency surface coils is widely used as follows: local coils at the spine, abdomen, etc. This allows the multi-channel rf surface coil assembly of the present embodiment, which is constructed by arranging the first rf surface coil 42 and the second rf surface coil 43 adjacent to each other in the same plane, to have the advantage of being used as a local coil for the spine, abdomen, etc.

In addition, the cooperation between the coil unit group 40 and the mounting portion 32 enables the coil unit group 40 to be detachably mounted on the support unit 30. This may be achieved, for example, by a mating member disposed between the coil unit group 40 and the mounting portion 32. According to some embodiments, the mating member may be a snap member, a removable securing member, such as: the configuration of the interface between the coil unit set 40 and the mounting portion 32 enables removable mating securement of the two. The coil unit group 40 can be easily mounted on and dismounted from the supporting unit 30, so that the multi-channel rf surface coil group according to this embodiment can be mounted on the supporting unit 30 as a local coil for receiving magnetic resonance signals proximate to the breast of the patient P, or can be independently used as a local coil at the position of the spine, abdomen, or the like when being dismounted from the supporting unit 30, which increases the usage scenarios and usage rates of the coil unit group 40 in the local coil apparatus 20 according to this embodiment.

According to some embodiments, as shown in fig. 1 and 5, the coil unit set 40 may include a coil housing 41, the multi-channel rf surface coil set is installed in the coil housing 41, and a second opening 44 is opened on the coil housing 41 at a position of the first rf surface coil 42 to allow the breast to enter the region enclosed by the first rf surface coil 42 through the second opening 44. The coil housing 41 may be made of engineering plastic or other materials that are generally suitable for adapting to the operating environment of the magnetic resonance tomography apparatus, which is not limited in this embodiment. It will be appreciated that when the coil housing 41 is mounted on the support unit, the patient's breast can be accessed through the second opening 44 in the coil housing into the receiving space provided in the support housing 31 at a position corresponding to the first radio frequency surface coil 42 to receive the breast of the patient P when the patient is lying prone on the support housing 31.

According to some embodiments, as shown in fig. 1 and 5, fig. 5 shows the coil housing 41 in a view facing the side mounted to the support housing 31. The mounting portion 32 of the support case 31 opens an accommodating space in which the coil case 41 is mounted to accommodate the coil case 41. The surface of the mounting portion 32 is further opened with a groove 34, the surface of the coil housing 41 facing the mounting portion 32 is opened with a protrusion 45, the position of the protrusion 45 corresponds to the position of the groove 34, so that the coil unit group 40 can be fixed/mounted on the supporting unit 30 by the cooperation between the protrusion 45 and the groove 34, and the coil housing 41 can make the protrusion 45 separate from the fixing with the groove 34 under the action of external force, thereby realizing the detachable mounting of the coil unit group 40 on the supporting unit 30. According to an illustrated embodiment, the mounting portion 32 of the support housing 31 defines an accommodating space having the same contour and size as the coil housing 41, which is not further limited in this embodiment.

According to some embodiments, as shown in fig. 1, 2 and 3, the local coil device 20 may further include: the cushion unit 50 can be installed on the coil unit set 40, and the cushion unit 50 is opened with a third opening 51, and the position of the third opening 51 corresponds to the position of the first rf surface coil 42, so that the breast of the patient can pass through the third opening 51 and then be surrounded by the first rf surface coil 42. It will be appreciated that the use of the cushion unit 51 increases the comfort of the patient in making a breast magnetic resonance tomography examination. The patient's breast may be received in the support housing 31 through the third opening 51 in the cushion unit 50, the second opening 44 in the coil housing 41, and the first opening 33 in the support housing 31 at a location corresponding to the first rf surface coil 42 to form a receiving space. The first radio frequency surface coil 42 may be utilized to receive magnetic resonance signals from the patient's breast within its enclosed region. Through the arrangement of the cushion unit 50, the coil unit group 40 and the support unit 30 in a reasonable position relationship, the first RF surface coil 42 is closer to the breast part by utilizing the structure thereof, and the optimal image signal-to-noise ratio is realized by using less coil units.

The multi-channel rf surface coil assembly comprising the first rf surface coil 42 and the second rf surface coil 43 provided by the present disclosure is described below with reference to the drawings.

According to an illustrated embodiment, as shown in FIG. 4, the coil unit set 40 includes a pair of first RF surface coils 42 disposed side-by-side, with adjacent first RF surface coils 42 overlapping at an edge, and the first RF surface coils 42 being capable of surrounding a corresponding pair of breasts of a patient, respectively; a plurality of second RF surface coils 43, the second RF surface coils 43 being adjacently disposed along the first RF surface coils 42 and overlapping adjacent first RF surface coils 42 at their edges and adjacent second RF surface coils 43 at their edges. It should be noted that the breasts of the patient P can be respectively passed through the respective regions enclosed by the pair of first rf surface coils 42, so that the first rf surface coils 42 are in close proximity to the breast tissue of the patient P to achieve the best image signal-to-noise ratio with respect to the breast tissue. It will be appreciated that the principle of decoupling by means of a low noise amplifier when overlapping at the edges of adjacent radio frequency surface coils is exploited in the above manner is not described in detail.

According to another illustrated embodiment, as shown in fig. 4, the first rf surface coils 42 of the coil unit group 40 may have a width ratio of 3:2 to the adjacent second rf surface coils 43 such that an 8-channel rf surface coil group is constructed by arranging one side of a pair of first rf surface coils 42 arranged side by side adjacent to three second rf surface coils 43 arranged side by side and the other side of the pair of first rf surface coils 42 arranged side by side also adjacent to the other three second rf surface coils 43 arranged side by side. The first rf surface coil 42 and the second rf surface coil 43 are configured as an 8-channel rf surface coil set by way of example only, and it is understood that the configuration is not limited to this manner, nor to an 8-channel rf surface coil set.

According to some embodiments, the first and second radio frequency surface coils 42, 43 are flexible coils. It can be understood that the flexible coil can better conform to the skin of a human body, provide a more comfortable experience for a patient and obtain images with better signal-to-noise ratio.

The present disclosure also provides a magnetic resonance tomography apparatus comprising the above-described local coil apparatus. The magnetic resonance tomography apparatus is described below with reference to the drawings.

Fig. 6 finally shows a schematic representation of a magnetic resonance tomography apparatus (also referred to below as MR system) 1, in which the local coil arrangement of the present disclosure can be used.

The core component of the magnetic resonance tomography apparatus 1 is a tomography apparatus 2, also referred to as a scanner 2, in which a cylindrical measurement volume of a patient is located on a patient bed 4The (patient channel) 3 is positioned and located on the local coil arrangement 20 such that the breast is accommodated in an accommodating space provided in the coil housing 41 of the local coil arrangement 20 corresponding to the second opening 44 of the support unit 30. Patient path 3 is used to transmit B₁The field HF transmission antenna arrangement 6 surrounds, for example, a birdcage antenna described at the outset. The B is₁The field surrounds the z direction, which in this case corresponds to the longitudinal, circular or elliptical polarization of the patient channel 3. In the usual manner, a field coil system 5 is located outside the rf transmission antenna arrangement 6, which field coil system 5 is composed of a basic field magnet and a plurality of gradient coils for applying gradient magnetic fields in the desired manner.

The scanner 2 and the patient couch 4 are controlled by a control device 10. This may be a conventional central control computer. The control computer is designed with a corresponding control interface 12 and a measurement control unit 11. The measurement control unit 11 controls the scanner 2 in accordance with a measurement protocol given in advance for performing measurement.

The control interface 12 is shown here only as a block. It is clear that the interface 12 may in reality consist of a plurality of individual interfaces. For example, interfaces for controlling gradient systems, radio-frequency transmission systems for transmitting radio-frequency pulses, etc., belong to this category. The control interface 11 also comprises an interface for transmitting control signals to the patient bed 4.

The magnetic resonance signals acquired by the scanner are received by the control computer via a receiving interface 13. The receiving interface 13 may also be composed of a plurality of partial interfaces. The magnetic resonance signals (MS) are then transmitted to a reconstruction device 14, from which the image data are reconstructed in the usual manner by fourier transformation, which are then displayed, for example, on the screen of the terminal 7 in the field and/or stored in a memory 17 and/or transmitted via a network interface 16 to the data bus 8, via which the magnetic resonance tomography apparatus 1 is connected to further devices within the network, in order, for example, to store the measurement data or the reconstructed image data completed in a large memory or to a diagnostic station or the like.

The entire magnetic resonance tomography apparatus 1 is controlled by the operator via a terminal 7, which terminal 7 is connected to a central control unit via a terminal interface 15. By means of the terminal 7 and the user interface implemented there, the operator can select, for example, a measurement protocol from the memory 17, match and ensure if necessary, on the basis of which the measurement control unit 11 outputs corresponding control information via the control interface 12 to the scanner 2, so that the measurement can be carried out.

Furthermore, the central control device and the scanner 2 may have a plurality of card assemblies, which are typical of the magnetic resonance tomography apparatus 1. All these components and the basic working of such an imaging system are well known to the person skilled in the art and therefore need not be explained in detail here.

The control device 10 need not necessarily be configured as an integrated unit, as is shown here, but may also be formed from a plurality of separate units, which are networked with one another in a suitable manner. The various components may also be implemented in software on a verified microcontroller. This applies in particular to the measurement control unit, the reconstruction unit or sub-modules thereof. It can be implemented, if necessary together with other components, on one or more computer units (e.g., microcontrollers) belonging to the control device.

The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A local coil arrangement for magnetic resonance tomography of a breast region, comprising:

the supporting unit comprises a supporting shell, wherein the supporting shell is provided with a supporting surface for supporting the prone position of a patient and a mounting part which is arranged on the supporting surface and used for mounting a coil unit group;

a coil unit group detachably mounted to the support unit by being fitted to the mounting part;

the coil unit group includes: at least one first radio frequency surface coil, the closed loop of the first radio frequency surface coil being capable of surrounding the patient's breast; and

and arranging a first opening on the support shell at a position corresponding to the first radio frequency surface coil to construct an accommodating space for accommodating the breast, so that the breast can be imaged at the accommodating space after passing through the area enclosed by the first radio frequency surface coil.

2. The local coil device according to claim 1, wherein the coil cell group further comprises: and the coil shell seals the radio frequency surface coil group in the coil shell, and a second opening is formed in the position, where the first radio frequency surface coil is located, of the coil shell so as to allow the breast to enter an area surrounded by the first radio frequency surface coil through the second opening.

3. The local coil device according to claim 2, wherein the mounting portion opens with an accommodating space in which the coil case is mounted to accommodate the coil case; and

the recess has been seted up to the installation department the coil casing towards the protruding portion is seted up to the surface that the installation department carried out the installation, protruding portion position with the position of recess corresponds, makes the coil casing can through with the protruding portion hold in thereby the cooperation is fixed between the recess on the supporting element, and the coil casing under the exogenic action the protruding portion can break away from in with the recess is fixed, thereby realizes coil unit group detachably install in the supporting element.

4. The local coil device according to claim 1, wherein the coil cell group further comprises: and the second radio frequency surface coil and the first radio frequency surface coil are positioned on the same plane and are adjacently arranged, and a multi-channel radio frequency surface coil group is formed by the second radio frequency surface coil and the first radio frequency surface coil.

5. The local coil arrangement according to claim 4, wherein the first and second radio frequency surface coils are flexible coils.

6. The local coil device according to any one of claims 1 to 5, wherein the coil unit group includes: a pair of first RF surface coils disposed side-by-side, adjacent ones of the first RF surface coils overlapping at an edge, and each of the first RF surface coils being capable of surrounding a respective one of the breasts;

a plurality of second radio frequency surface coils adjacently disposed along the first radio frequency surface coil and overlapping edges adjacent to the first radio frequency surface coil, and edges between adjacent second radio frequency surface coils overlap.

7. The local coil device according to claim 6, wherein the ratio of the widths of the first and second radio frequency surface coils is 3: and 2, one side of the pair of first radio frequency surface coils arranged side by side is adjacent to three second radio frequency surface coils arranged side by side, the other side of the pair of first radio frequency surface coils arranged side by side is adjacent to the other three second radio frequency surface coils arranged side by side, and therefore the second radio frequency surface coils and the first radio frequency surface coils are constructed into an 8-channel radio frequency surface coil group.

8. The local coil apparatus according to claim 1, further comprising: the cushion unit can be arranged on the coil unit group, and a third opening is formed in the cushion unit, so that the breast can be surrounded by the first radio frequency surface coil after passing through the third opening.

9. A magnetic resonance tomography apparatus, characterized in that it comprises a local coil apparatus according to any one of claims 1 to 8.