Brace-shaped magnetic resonance oral cavity wireless coil and magnetic resonance imaging equipment
By designing a brace-shaped magnetic resonance oral wireless coil and optimizing the signal-to-noise ratio using a flexible wireless resonant ring array and resonant circuit, the problems of insufficient sensitivity and poor comfort in existing oral MRI technology have been solved, achieving high-quality oral imaging and improved patient comfort.
Patent Information
- Application Number
- CN202520317040.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-26
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-26
AI Technical Summary
Current oral MRI technology suffers from insufficient sensitivity, signal interference, and a lack of optimization for oral anatomy, resulting in poor image quality, especially low signal-to-noise ratio when imaging teeth and periodontal tissues. Furthermore, traditional coils are not comfortable to wear.
A brace-shaped magnetic resonance oral wireless coil is designed, employing a flexible wireless resonant ring array that closely conforms to the oral anatomy. It is attached to the oral region through a flexible substrate to enhance signal reception, and the signal-to-noise ratio is optimized through resonant circuits and detuning loops. Combined with a head array coil, high-resolution imaging is achieved.
It achieves high signal-to-noise ratio oral imaging, can simultaneously image the upper and lower dentition, simplifies the process, improves patient comfort, adapts to diverse oral anatomy structures, and provides excellent soft tissue contrast and high-resolution images.
Smart Images
Figure CN223742716U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of magnetic resonance imaging, and particularly relates to a mouthpiece-shaped magnetic resonance oral wireless coil and a magnetic resonance imaging device. BACKGROUND
[0002] Magnetic resonance imaging (MRI) technology is becoming a revolutionary alternative to traditional X-ray imaging technologies such as cone beam computed tomography (CBCT). Although CBCT has long dominated in dental clinics due to its excellent hard tissue imaging capabilities, it gradually exposes some limitations due to its dependence on ionizing radiation and limited soft tissue contrast. These limitations have prompted the exploration of MRI technology in the field of dental imaging, especially under the drive of soft tissue contrast and non-radiation imaging advantages, MRI provides a new perspective for oral diagnosis. In the MRI process, signal acquisition includes two stages of radio frequency excitation and radio frequency reception. In the radio frequency excitation stage, the MRI system sends radio frequency signals to the oral area through the transmitting coil to excite hydrogen nuclei; in the receiving stage, the signals released by the hydrogen nuclei are captured by the receiving coil and fed back to the imaging system. The performance of the receiving coil directly affects the image quality.
[0003] The main problems of the existing coil design in oral MRI technology are insufficient sensitivity, signal interference, and lack of optimization design for oral anatomical features. The primary challenge of oral MRI technology is to design a specially optimized receiving coil to meet the unique imaging needs of the oral area. Compared with general coils for head and neck or other parts, oral coils need to be customized for the small range, high density, and complex anatomical structure of the oral cavity. First, the imaging targets in the oral area (such as teeth, roots, periodontal tissue, and dental pulp) are densely distributed and have significant anatomical interfaces, which requires the coil to efficiently capture weak signals and provide high-resolution imaging. High sensitivity is crucial because the target area in the oral cavity is small and the signal is weak, and traditional head and neck coils often cannot provide sufficient signal sensitivity due to design limitations, resulting in reduced image resolution. Second, oral area imaging often requires high spatial adaptability because the complex structure of the oral cavity (such as tooth arrangement, hard and soft tissue junctions, etc.) requires the coil to accurately cover the target area while avoiding signal loss or imaging area obstruction. However, existing general head and neck coil designs usually do not take into account these unique anatomical features, so there are deficiencies in sensitivity, signal-to-noise ratio, and spatial adaptability when performing oral imaging, which affects the improvement of image quality. Through analysis, the coil design of the current oral MRI technology mainly has the following deficiencies:
[0004] 1) Existing oral imaging usually adopts head and neck coil as receiving coil. The conventional commercial head and neck coil usually keeps a certain distance from the oral area, resulting in a significant decrease in signal acquisition sensitivity, especially in deep areas such as dental pulp and periodontal tissue. The design of the coil is mainly around large-scale uniform imaging, and the number of turns and wire distribution are not optimized for small-scale targets, so it cannot perform best in local imaging in the oral cavity. In addition, the signal of the cheek, buccal fat pad and lip is usually stronger than that of the tooth and root area, and the head and neck coil cannot effectively isolate these interference signals, resulting in a decrease in the signal-to-noise ratio of the target area imaging; in addition, there are oral and intraoral coils in addition to the receiving coil, the oral coil is attached to the lips, but the imaging depth is insufficient, and the intraoral coil has better imaging effect than the oral coil, but due to heating, there is a safety hazard.
[0005] 2) Existing oral imaging adopts surface coil. The adaptability of the surface coil is insufficient, and its rigid design makes it difficult to completely fit the complex oral anatomy, such as the curved shape of the dentition and the spatial difference between the upper and lower jaws. The surface coil is usually a single-layer design, and its sensing range is limited, making it difficult to cover multiple tooth areas at the same time, especially in patients with wide dental arches, which may result in signal loss.
[0006] 3) Existing oral imaging attempts small local coils. Small coils have significantly improved sensitivity due to their extremely close proximity to the target area, but their coverage is small and they cannot image the entire dentition at once. Its sensing area is usually 3-5 cm, which needs to be moved multiple times for scanning, which increases the complexity of the examination and the discomfort of the patient.
[0007] In view of the above challenges, oral MRI technology urgently needs a new coil design that can improve the signal-to-noise ratio of fine oral structures such as periodontal tissue and dental pulp, and at the same time improve the signal reception ability of deep tissues, while taking into account the flexibility of the coil and the comfort of the patient. Invention content
[0008] The technical problem solved by the present application is: how to provide a magnetic resonance oral wireless coil that can improve the imaging effect of the oral area and improve the flexibility of the coil and the comfort of the patient.
[0009] The present application provides a dental mouthpiece-shaped magnetic resonance oral wireless coil, comprising:
[0010] A plurality of wireless resonance rings, each wireless resonance ring is a flexible loop structure, and each wireless resonance ring is arranged in an array and coupled with an adjacent wireless resonance ring, and the wireless resonance ring is used for receiving a magnetic resonance signal;
[0011] A flexible substrate, a plurality of wireless resonance rings are arranged on the flexible substrate, and the flexible substrate is used for attaching to the oral area.
[0012] Optionally, the wireless resonance ring comprises:
[0013] a flexible conductive loop in a closed loop structure;
[0014] a resonance circuit comprising a first capacitor;
[0015] a detuning circuit comprising a second capacitor and an inductor.
[0016] Optionally, the detuning circuit further comprises two diodes.
[0017] Optionally, the coupling mode of two adjacent wireless resonance rings is overlapping decoupling.
[0018] Optionally, the two adjacent wireless resonance rings are cross-laid to achieve overlapping decoupling.
[0019] Optionally, the number of wireless resonance rings is at least four.
[0020] Optionally, the wireless resonance ring is detachably attached to the flexible substrate.
[0021] Optionally, the arrangement of each wireless resonance ring is arranged in a row and multiple columns.
[0022] The application also provides a magnetic resonance imaging device, which comprises the above-mentioned mouthpiece-shaped magnetic resonance oral wireless coil and a head array coil.
[0023] The application provides a mouthpiece-shaped magnetic resonance oral wireless coil and a magnetic resonance imaging device, which have the following technical effects:
[0024] The unique mouthpiece-shaped structure closely fits the oral anatomy, has high sensitivity, can simultaneously image the upper and lower dentition, realizes full-mouth scanning and greatly simplifies the process, the coil has ultra-high resolution and excellent signal-to-noise ratio, can accurately capture the crown, root canal and periodontal tissue, provides excellent soft tissue contrast, and its compact and adaptable design takes into account patient comfort and diverse needs. BRIEF DESCRIPTION OF DRAWINGS
[0025] Figure 1 FIG. 1 is a schematic view of a mouthpiece-shaped magnetic resonance oral wireless coil according to one or more embodiments;
[0026] Figure 2 FIG. 2 is a schematic view of the arrangement of each wireless resonance ring according to one or more embodiments;
[0027] Figure 3 FIG. 3 is a circuit schematic diagram of a wireless resonance ring according to one or more embodiments;
[0028] Figure 4 Fig. 1 is a working schematic diagram of a magnetic resonance imaging device according to one or more embodiments and a test result diagram;
[0029] Figure 5 Fig. 2 is a separate imaging diagram of a head array coil according to one or more embodiments and an imaging diagram of a magnetic resonance oral wireless coil and a head array coil cooperation. DETAILED DESCRIPTION
[0030] In order to make the purposes, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.
[0031] Before describing various embodiments of the present application in detail, first, the technical concept of the present application is simply described: at present, when performing magnetic resonance imaging on an oral cavity, a traditional commercial head and neck coil is usually used to perform imaging on the oral cavity region or a surface coil is set, on the one hand, it is difficult to perform good imaging on the oral cavity region, on the other hand, it is also difficult to match the oral cavity shape, it is more difficult to obtain complete imaging signals, and the wearing comfort and use flexibility are poor. For this reason, the present application provides a dental mouthpiece-shaped magnetic resonance oral wireless coil and a magnetic resonance imaging device, a plurality of flexible wireless resonance rings are arranged on a flexible substrate, the shape of the flexible substrate is flexibly adjusted according to needs and then attached to the oral cavity region, the wireless resonance rings are used to receive magnetic resonance signals, the magnetic resonance oral wireless coil can better adapt to and cover the oral cavity shape region, and the distance is closer, higher quality imaging can be obtained, and the wearing effect is more comfortable. The specific principles of the dental mouthpiece-shaped magnetic resonance oral wireless coil and the use method thereof of the present application will be described below in combination with more embodiments.
[0032] Specifically, as shown in Figure 1 , Figure 2 , Figure 3 the dental mouthpiece-shaped magnetic resonance oral wireless coil of the first embodiment of the present application includes a plurality of wireless resonance rings 10 and a flexible substrate 20, each wireless resonance ring 10 is a flexible loop structure, each wireless resonance ring 10 is arranged in an array and adjacent two wireless resonance rings 10 are coupled, the wireless resonance ring 10 is used to receive a magnetic resonance signal, the plurality of wireless resonance rings 10 are arranged on the flexible substrate 20, and the flexible substrate 20 is used to attach to the oral cavity region. Among them, the magnetic resonance oral wireless coil adopts a flexible design, improves deep-level imaging of the oral cavity anatomical structure, closely attaches to the teeth, is located between the teeth and the lips, does not affect the tongue movement, and takes into account the comfort of the patient. The wireless resonance ring 10 can be directly attached to the place where the signal needs to be enhanced, there is no cable and radio frequency connector, the use process is simplified, and the patient experience is improved.
[0033] In one or more embodiments, the wireless resonance ring 10 comprises a flexible conductive loop 11, a resonance circuit 12, and a detuning circuit 13, the flexible conductive loop 11 is in a closed loop structure, the resonance circuit 12 comprises a first capacitor, and the detuning circuit 13 comprises a second capacitor and an inductor, the tuning of the wireless resonance ring 10 is achieved by the first capacitor C1 in the resonance circuit, and the frequency of the detuning circuit is achieved by adjusting the second capacitor C2 and the inductor L1. Each wireless resonance ring 10 is precisely tuned to a predetermined resonance frequency, so that it enhances the strength of the B1- field without interfering with the B1+ field, achieving high signal-to-noise ratio imaging of delicate oral structures such as periodontal tissue and dental pulp, and achieving local signal enhancement of specific areas through the wireless resonance ring, significantly improving the imaging effect of deep oral structures such as tooth roots and jaw bones.
[0034] Illustratively, the detuning circuit 13 further comprises two diodes for controlling the conduction or shutdown of the detuning circuit, so that the magnetic resonance oral wireless coil can be effectively matched with the head array coil. Among them, the diode adopts PIN type diode.
[0035] In one or more embodiments, the coupling mode of the two adjacent wireless resonance rings 10 is overlap decoupling. Illustratively, the two adjacent wireless resonance rings are cross-laid to achieve overlap decoupling. For example, the proportion of the cross-laid of the two adjacent wireless resonance rings is set to ten percent, and the overlap area and overlap angle are not limited.
[0036] In one or more embodiments, the number of wireless resonance rings 10 is at least four, that is, the magnetic resonance oral wireless coil is a four-channel coil. Illustratively, the arrangement mode of each wireless resonance ring 10 is one-row multi-column arrangement, that is, each wireless resonance ring 10 is arranged in a straight line, which can adapt to the shape of the oral cavity.
[0037] The wireless resonance ring 10 is detachably attached to the flexible substrate 20, so as to adjust the number of wireless resonance rings 10 according to the size of the oral cavity, ensure the best imaging effect, and have a wide coverage range. Illustratively, each wireless resonance ring 10 has a flexible bearing layer 14 below, which can bear the flexible conductive loop 11, the resonance circuit 12, and the detuning circuit 13, and also facilitates the attachment of the flexible bearing layer 14 to the flexible substrate 20. Each wireless resonance ring 10 is an independent module and adopts a detachable design, multiple resonance rings can be stacked to form a signal enhancement array, which has scalability, and the independent module design reduces the equipment failure rate and improves the maintenance convenience. It can be dynamically combined with any commercial coil (including head / chest / limb coil), and can also realize signal amplification function through plug-and-play mode.
[0038] In one or more embodiments, the magnetic resonance imaging device comprises the above-mentioned dental mouthpiece-shaped magnetic resonance oral wireless coil and the head array coil. The working process of the magnetic resonance imaging device is described as follows:
[0039] As Figure 4 shown, when the head array coil (4WTC) works in the transmitting phase, the detuning module in the wireless resonance ring 10 (Head Coil 48 channel) and the PIN diode in the RF module of the array coil are turned on, so that the entire circuit is in a detuned state, preventing the RF signal from breaking down the circuit; when the array coil works in the receiving phase, the detuning module in the wireless resonance ring and the PIN diode in the RF module of the array coil are turned off, so that the signal can pass through. In order to prevent common-mode current from being generated in the circuit, there is a trap circuit resonating at the same Larmor frequency on the coaxial cable of each coil to reduce common-mode current. The signal then passes through the trap circuit to the phase-locked loop; in order to reduce the insertion loss after the module cascade, the phase shifter adopts a pi-type phase shifter or a T-type phase shifter, which changes the phase of the signal received from the coil to the phase set by the magnetic resonance system. The signal passes through the amplifier to amplify the weak magnetic resonance voltage signal received from the coil, and is transmitted to the computer through the bed for signal post-processing, and the image reconstruction is completed. According to the test results, combined with Figure 5 shown, the wireless resonance ring 10 improves the signal-to-noise ratio of the image by more than 6.8 times within a certain range, thereby improving the signal-to-noise ratio and image quality of the image, and enhancing the imaging effect of the periodontal tissue and dental pulp part, facilitating subsequent diagnosis by doctors.
[0040] The magnetic resonance oral wireless coil in the shape of a mouthpiece provided by the embodiment has the following effects: for complex or deep structures in the oral cavity that require special imaging, first, the adaptability of the oral coil is optimized to closely fit the oral anatomy and ensure the imaging depth of the target area; second, the wireless resonance ring enhances the signal-to-noise ratio near the subcutaneous position, and the signal-to-noise ratio of the upper and lower dental tissues is significantly improved. Moreover, the four-channel intraoral coil is universal for commercial head coils. In addition to technical innovation, this wireless mouthpiece-shaped coil also provides an economical and efficient multifunctional solution for clinical applications. The compact and adaptable design not only reduces manufacturing costs, but also ensures compatibility with various anatomical variations, making it suitable for various oral imaging needs.
[0041] The specific embodiments of the present application are described in detail above, although some embodiments have been shown and described, those skilled in the art should understand that modifications and improvements can be made to these embodiments without departing from the principles and spirits of the present application, which are defined by the claims and their equivalents, and these modifications and improvements should also be within the protection scope of the present application.
Claims
1. A mouthpiece shaped magnetic resonance oral wireless coil, characterized in that, The magnetic resonance oral wireless coil comprises: a plurality of wireless resonance loops, each wireless resonance loop being a flexible loop structure, and each wireless resonance loop being arranged in an array and coupled with an adjacent wireless resonance loop, the wireless resonance loop being configured to receive a magnetic resonance signal; a flexible substrate, and the plurality of wireless resonance loops being arranged on the flexible substrate, the flexible substrate being configured to be attached to an oral cavity region.
2. A mouthpiece-shaped magnetic resonance oral wireless coil according to claim 1, characterized in that, The wireless resonance loop comprises: a flexible conductive loop, the flexible conductive loop being a closed loop structure; a resonance circuit, the resonance circuit comprising a first capacitor; a detuning circuit, the detuning circuit comprising a second capacitor and an inductor.
3. A mouthpiece-shaped magnetic resonance oral wireless coil according to claim 2, characterized in that, The detuning circuit further comprises two diodes.
4. The mouthpiece-shaped magnetic resonance oral wireless coil of claim 1, wherein, The coupling mode of the adjacent two wireless resonance loops is overlap decoupling.
5. A mouthpiece-shaped magnetic resonance oral wireless coil according to claim 4, characterized in that, The adjacent two wireless resonance loops are cross-laid to realize overlap decoupling.
6. The mouthpiece-shaped magnetic resonance oral wireless coil of claim 1, wherein, The number of the wireless resonance loops is at least four.
7. The mouthpiece-shaped magnetic resonance oral wireless coil of claim 1, wherein, The wireless resonance loop is detachably attached to the flexible substrate.
8. The mouthpiece-shaped magnetic resonance oral wireless coil of claim 1, wherein, The arrangement mode of each wireless resonance loop is one-row multi-column arrangement.
9. A magnetic resonance imaging apparatus, characterized by The magnetic resonance imaging device comprises the tooth guard-shaped magnetic resonance oral wireless coil and a head array coil according to any one of claims 1 to 8.