Separable wireless resonator array device for interventional magnetic resonance imaging

Abstract

The utility model discloses a separable wireless resonator array device used for interventional magnetic resonance imaging, which is composed of two parts, namely a movable annular resonator part and a fixed annular coil array part, the annular coil array part can be accommodated in the annular resonator part, and the annular resonator part and the fixed annular coil array part can be separated from each other. The inductive coupling is used for receiving, transmitting and amplifying an MRI signal; according to the utility model, the structure is simple, expensive elements such as a coil ID chip, a pre-amplifier and a plug are not needed, the wireless design allows easy integration with an iMRI system, and the coil becomes a disposable product due to the simplicity and low cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to a nuclear magnetic resonance system imaging technical field, concretely relates to a kind of separable wireless resonator array device for interventional magnetic resonance imaging. BACKGROUND

[0002] Interventional Magnetic Resonance (Interventional Magnetic Resonance), is applied to the purpose of magnetic resonance guided instrument to achieve diagnosis or treatment of disease. As an interventional guide tool, magnetic resonance has incomparable advantages over other imaging methods, its tissue contrast is excellent, spatial resolution reaches sub-millimeter level, and it is beneficial to lesion positioning and interventional guidance. More importantly, magnetic resonance has the ability of multi-plane and three-dimensional volume reconstruction, which can comprehensively evaluate the important anatomical relationship between interventional target and adjacent tissue.

[0003] During the interventional operation process, the physician needs to be able to access the patient at any time. The emergence of open magnet technology and the progress of fast imaging technology enable the development of interventional therapy under the guidance of magnetic resonance. The open magnetic resonance system has a large imaging space, and the operation can be performed inside and outside the scanning area. Intraoperative scanning and monitoring can be performed at any time, which not only facilitates real-time observation of intraoperative conditions, but also greatly improves work efficiency.

[0004] Intraoperative MRI provides real-time imaging during the operation process, which is crucial for precise positioning and complete tumor resection, reducing the risk of residual tissue and the need for repeated operations in neurosurgery. In order to be effectively used in the operation, the top of the RX coil should be easily detachable, sterile, and sometimes disposable. The standard close-fitting helmet array with complex cables is not suitable. SUMMARY

[0005] The separable wireless resonator array device for interventional magnetic resonance imaging can solve at least one of the technical problems in the background art. Specifically, it is a separable wireless resonator array device for interventional magnetic resonance imaging, which is composed of two parts, a movable annular resonator part and a fixed annular coil array part. The annular coil array part can be accommodated in the annular resonator part, and inductive coupling is used for MRI signal reception, transmission and amplification.

[0006] The annular resonator part is an annular matrix structure composed of two or more parallel decoupling wireless coils, which are connected after being bent. The integrated package is vertically fixed on the horizontal support. The annular matrix structure is coupled with the local wired coil array, and the base material used for integrated package is made of magnetic resonance compatible electrically insulating material. It provides full coverage for MRI scanning, and is removed during the operation, and has no physical or electrical connection with the annular coil array part.

[0007] The annular coil array part is an annular array cavity surrounded by four or more parallel or separate planar structure decoupling wireless coils, which is used to accommodate the body to be imaged, and the integrated package is installed on the detection table of the in-vivo imaging area in a suitable position.

[0008] The planar structure decoupling wireless coil comprises a conductor material, and a series combination of one inductor and two anti-parallel PIN diodes, a decoupling capacitor connected in parallel with the series combination, and at least one cross capacitor connected in series with the conductor material, forming a circular coil or a rectangular coil or any other arbitrary coil form.

[0009] The annular resonator part is freely placed in the magnetic resonance instrument by a horizontal support, and is relatively stationary; the annular coil array part is directly fixed or relatively fixed around the body to be imaged, and moves relatively with the detection table.

[0010] The annular resonator part has an angle θ with the vertical direction of the horizontal support, 0<θ<60 degrees, which is adjusted by a gear adjustment structure or a universal ball head adjustment structure.

[0011] The annular coil array part for the head comprises a U-face coil matrix structure and a planar coil surrounding a through cavity, the U-face coil matrix structure is suspended and supported by a U-shaped frame with a concave surface in the same direction, and adjusting bolts are arranged on both sides, the planar coil is opposite to the concave surface and is fixed on the U-shaped frame, and the U-shaped frame is connected to one end edge of the detection table through a movable adjustment component.

[0012] The movable adjustment component comprises a transverse adjustment member and a longitudinal adjustment member, a groove is formed at one end of the transverse adjustment member, and the transverse adjustment member is fixed to the bottom of the U-face of the U-shaped frame through a bolt thread, the other end of the transverse adjustment member is connected to one end of the longitudinal adjustment member through a pin, and the transverse adjustment member or the longitudinal adjustment member can move in the horizontal direction of the plane,

[0013] The other end of the longitudinal adjustment member is movably connected to the edge of the detection table through a bolt, and can move in the vertical direction of the plane of the longitudinal adjustment member.

[0014] As can be seen from the above technical solution, the utility model has the advantages of simple structure, no need for expensive elements such as coil ID chip, preamplifier and plug, wireless design allows easy integration with iMRI system, simplicity and low cost make the coil a disposable product. These characteristics together make this detachable wireless resonator array system an ideal choice for iMRI. It is worth noting that this detachable wireless resonator array system is tunable, and does not need to modify any parameters of RF transmission.

[0015] At the same time, the detachable wireless resonator array device for interventional magnetic resonance imaging exhibits SNR and parallel imaging performance comparable to the most advanced head array coils, while maintaining a split design, simpler structure and significantly reduced cost; this design improves iMRI and MR-guided therapy applications by providing an economically efficient, easy-to-use solution to support advanced imaging capabilities and surgical requirements. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the ring resonator schematic diagram of the utility model;

[0017] Figure 2 is the ring resonator coil schematic diagram of the utility model;

[0018] Figure 3 is the side view of the ring coil array of the utility model;

[0019] Figure 4 is the perspective view of the ring coil array of the utility model;

[0020] Figure 5 is the preparation work schematic diagram of the utility model;

[0021] Figure 6 is the application work schematic diagram of the utility model;

[0022] Figure 7 is the axial SNR graph comparison graph;

[0023] Figure 8 is the comparison of noise correlation and g factor graph (R=2, AP). DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments.

[0025] Taking head scan as an example:

[0026] A detachable wireless resonator array device for interventional magnetic resonance imaging is composed of a movable ring resonator part 1 and a fixed ring coil array part, the ring coil array part can be accommodated in the ring resonator part 1, and inductive coupling is used for MRI signal receiving transmission and amplification.

[0027] As Figure 1 , Figure 2 , Figure 6As shown, the annular resonator portion 1 is a ring matrix structure 4 composed of eight sets of parallel structure decoupling wireless coils connected in parallel after bending, and the integrated package is fixed vertically on the horizontal support 2. The ring matrix structure 4 is coupled with the local wired coil array 3, and the substrate used for the integrated package is made of magnetic resonance compatible electrically insulating material, providing full coverage for MRI scanning, which will be removed during surgery, and has no physical or electrical connection with the annular coil array portion.

[0028] As shown in Figure 3 , Figure 4 , the annular coil array portion is an annular array containing cavity surrounded by four sets of parallel structure decoupling wireless coils arranged in parallel or separated after bending, which is used to contain the body to be imaged, and the integrated package is installed in the appropriate position of the intraoperative imaging area detection table. The substrate used for the integrated package is made of magnetic resonance compatible electrically insulating material, integrated with the head fixation system, and remains stationary throughout the entire surgical process.

[0029] The parallel structure decoupling wireless coil includes a conductor material, and a set of series combination of one inductor and two anti-parallel PIN diodes, and a decoupling capacitor connected in parallel after the series combination, and three cross-over capacitors connected in series through the conductor material, forming a rectangular coil.

[0030] The annular resonator portion 1 is freely placed in the magnetic resonance instrument 13 through the horizontal support, and is relatively stationary; the annular coil array portion is directly fixed or relatively fixed to cover around the body to be imaged, and moves relatively with the detection table 12.

[0031] The annular resonator portion 1 has an included angle θ of 30 degrees between the vertical direction of the horizontal support 2, which is adjusted by the universal ball head adjusting structure.

[0032] The annular coil array portion includes a U-face coil matrix structure 5 and a planar coil 6 surrounded by a through cavity, the U-face coil matrix structure 5 is supported by a U-shaped frame 7 to keep the concave surface in the same direction, and the planar coil 6 is fixed opposite to the concave surface on the U-shaped frame 7, and the two sides are provided with adjusting bolts 11, and the U-shaped frame 7 is connected to one end edge of the detection table 12 through the movable adjusting component.

[0033] The movable adjusting component includes a transverse adjusting part 8 and a longitudinal adjusting part 10, one end of the transverse adjusting part 8 is provided with a groove, and the other end of the transverse adjusting part 8 is connected with one end of the longitudinal adjusting part 10 through a pin 9, which can move in the horizontal direction of the transverse adjusting part 8 or the longitudinal adjusting part 10,

[0034] The other end of the longitudinal adjusting part 10 is movably connected with the edge of the detection table 12 through a bolt, and can be adjusted in the vertical direction of the longitudinal adjusting part 10.

[0035] As Figure 5 and Figure 6 shown, the annular resonator portion is placed stationary within the magnetic resonance instrument 13, and the annular coil array portion is kept in place to cover the region of interest, adjusted for tilt angle according to the actual scan, and moved slowly into the coverage of the annular resonator portion with the detection table.

[0036] GRE scans were performed on a cylindrical phantom to demonstrate SNR performance, demonstrating three cases:

[0037] (1) a commercial 12-channel head array, as a baseline for comparison;

[0038] (2) a wireless resonator array of existing conventional body coils;

[0039] (3) the wireless resonator array of the present embodiments.

[0040] As Figure 7 shown, axial SNR maps measured for the above three demonstration cases, in addition to the phantom scans, in vivo MRI scans, including T1-weighted (T1W) and T2-weighted turbo spin echo (T2 TSE) sequences, were performed using coils approved by the local IRB. For all scans, the body coil was used for radio frequency transmission by default, and the wireless resonator array was detuned or disabled where applicable.

[0041] Compared to the commercial 12-channel head array:

[0042] 1) the wireless resonator array exhibited similar SNR in the top and central regions, and about 20% SNR in the bottom region, whether using the body coil or the local tiled receive array as the primary coil;

[0043] 2) the present technical solution also exhibited better parallel imaging capability than the commercial 12-channel head array, with lower maximum / average g-factor, as Figure 8 shown, showing in vivo images obtained by the present embodiments, with an acceleration factor of 2 in the AP direction. These images have excellent spatial resolution within reasonable scan time, and clearly delineate detailed anatomy and fully cover the entire brain. These images represent native acquisition of the 1.5 T MR scanner, without application of correction algorithms.

[0044] The various embodiments in the specification are described in a related manner, and the same and similar parts between the various embodiments can be referred to each other, and each embodiment focuses on the difference from other embodiments. In particular, for the system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the part of the method embodiment.

[0045] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A detachable wireless resonator array device for interventional magnetic resonance imaging, consisting of a movable annular resonator part and a fixed annular coil array part, which can be accommodated in the annular resonator part, characterized in that: the annular resonator part is a ring matrix structure composed of two or more parallel bending and connecting of planar structure decoupling wireless coils, integrated with a package edge package vertically fixed on a horizontal support, the annular coil array part is a ring array accommodating cavity surrounded by four or more parallel or separate arrangement bending of planar structure decoupling wireless coils, which is used to accommodate the body to be imaged, integrated with a package edge package installed in the appropriate position of the intraoperative imaging area detection table, the planar structure decoupling wireless coil includes a conductor material, and a series combination of one inductor and two anti-parallel PIN diodes in series, followed by a decoupling capacitor in parallel, and then at least one cross capacitor in series through the conductor material, forming a circular or rectangular or other arbitrary coil form.

2. A separable wireless resonator array device for interventional magnetic resonance imaging according to claim 1, characterized in that The annular resonator part is freely placed in the magnetic resonance instrument through the horizontal support, and is relatively stationary; the annular coil array part is directly fixed or relatively fixed to cover the body to be imaged around, and moves relatively with the detection table.

3. The separable wireless resonator array device for interventional magnetic resonance imaging of any of claims 1 or 2, wherein: There is an angle θ between the annular resonator part and the vertical direction of the horizontal support, 0<θ<60 degrees, which is adjusted by a gear adjustment structure or a universal ball head adjustment structure.

4. The separable wireless resonator array device for interventional magnetic resonance imaging of claim 3, wherein: The base material used in the integrated package edge package is made of magnetic resonance compatible electrically insulating material.

5. The separable wireless resonator array device for interventional magnetic resonance imaging of claim 4, wherein: The annular coil array part for the head includes a U-face coil matrix structure and a planar coil surrounding a through cavity, the U-face coil matrix structure is supported by a U-shaped frame with concave surfaces in the same direction, and the two sides are provided with adjusting bolts, the planar coil is opposite to the concave surface and is fixed on the U-shaped frame, and the U-shaped frame is connected to one end edge of the detection table through a movable adjusting part.

6. The separable wireless resonator array device for interventional magnetic resonance imaging of claim 5, wherein: The movable adjusting part includes a transverse adjusting part and a longitudinal adjusting part, one end of the transverse adjusting part is provided with a groove, and the U-shaped frame U-face bottom is fixed through a bolt thread, the other end of the transverse adjusting part is connected with one end of the longitudinal adjusting part through a pin, and can move in the horizontal direction of the transverse adjusting part or the longitudinal adjusting part, the other end of the longitudinal adjusting part is movably connected with the edge of the detection table through a bolt, and can move in the vertical direction of the longitudinal adjusting part.

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