Noise reducing headphones for magnetic resonance examinations

Abstract

The embodiment of the application provides a kind of for magnetic resonance examination noise reduction earphone, belong to medical instrument field.The noise reduction earphone for magnetic resonance examination includes: sound production module and earplug noise reduction module;Wherein, the input end of sound production module is connected with external terminal, for the sound signal that external user is sent out through external terminal is transmitted to earplug noise reduction module after pre-processing, make the sound pressure frequency response curve of ear sound meet preset flat condition;Earplug noise reduction module includes earplug and sound tube, earplug is used to put into the ear canal of target user, the output end of sound production module is communicated with one end of sound tube, the other end of sound tube is used to pass through earplug and for the sound of external user is transmitted into target user ear.The noise reduction earphone for magnetic resonance examination provided in the embodiment of the application is used to reach the technical effect of improving noise reduction effect while improving two-way communication quality in magnetic resonance examination environment.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a noise-canceling headphone for magnetic resonance imaging (MRI) examination. Background Technology

[0002] During an MRI scan, the patient is exposed to extremely high noise levels (up to 110 to 130 decibels). This noise originates from the Lorentz force vibrations generated in a strong static magnetic field when the gradient coil rapidly switches current.

[0003] During MRI scans, real-time communication between the user and an external physician (doctor or examination staff) is often required to ensure a smooth examination. This communication is typically achieved through speakers and microphones mounted on the MRI machine. To reduce noise, disposable earplugs or noise-canceling earmuffs are usually provided.

[0004] However, after observing target users using existing noise reduction methods, the inventors found that the relevant technologies have at least the following problems: in magnetic resonance examination environments with a wide frequency range and high sound pressure level, there is a problem that noise reduction effect and two-way communication quality cannot be simultaneously achieved. Summary of the Invention

[0005] This application provides a noise-canceling headset for magnetic resonance imaging (MRI) examination, which aims to improve noise reduction while enhancing the quality of two-way communication in the MRI examination environment.

[0006] In a first aspect, embodiments of this application provide noise-canceling headphones for magnetic resonance imaging (MRI) examination, including: a sound-generating module and an earplug noise-canceling module;

[0007] The input end of the sound-generating module is connected to an external terminal, which is used to transmit the sound signal emitted by the external user through the external terminal to the noise reduction module after preprocessing, so that the sound pressure frequency response curve of the sound entering the ear meets the preset flat condition.

[0008] The earplug noise reduction module includes an earplug and a sound transmission tube. The earplug is inserted into the ear canal of the target user. One end of the sound transmission tube is connected to the output end of the sound-generating module, and the other end of the sound transmission tube passes through the earplug and is used to transmit the voice of the external user into the ear of the target user.

[0009] In one possible implementation, the sound-generating module includes: a sound duct, a micro-sound-generating unit, a signal equalization processing unit, an impedance matching conduit, and a housing; wherein, the output end of the sound duct is connected to the input end of the sound transmission air tube, the input end of the micro-sound-generating unit is electrically connected to the signal equalization processing unit, and the output end of the micro-sound-generating unit is connected to both the sound duct and the impedance matching conduit; the input end of the signal equalization processing unit is connected to the external terminal; the output end of the impedance matching conduit is connected to the sound duct; and the sound duct, the micro-sound-generating unit, the signal equalization processing unit, and the impedance matching conduit are all integrated and installed within the housing.

[0010] In one possible implementation, the signal equalization processing unit includes a first resistor R1, a first capacitor C1, a second resistor R2, an operational amplifier U1, a third resistor R3, a second capacitor C2, a gain amplifier U2, a fifth resistor R5, and a third capacitor C3. The external terminal is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the second resistor R2. The first capacitor and the second resistor R2 are connected in parallel. The other ends of the first resistor R1 and the first capacitor C1 are both connected to the input terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 is connected to one end of the second capacitor C2 and the third resistor R3. The second capacitor C2 and the third resistor R3 are connected in parallel, and the other ends of the second capacitor C2 and the third resistor R3 are both connected to the input terminal of the gain amplifier U2. The output terminal of the gain amplifier U2 is connected to one end of both the fifth resistor R5 and the third capacitor C3. The fifth resistor R5 and the third capacitor C3 are connected in parallel, and the output terminal of the parallel connection of the fifth resistor R5 and the third capacitor C3 is connected to the input terminal of the micro-sound-emitting unit.

[0011] In one possible implementation, the signal equalization processing unit further includes a fourth resistor R4 and a potentiometer VR1; wherein the output terminal of the gain amplifier U2 is connected to one end of the fourth resistor R4 and the potentiometer VR1, the fourth resistor R4 and the potentiometer VR1 are connected in parallel, and the output terminal of the fourth resistor R4 and the potentiometer VR1 connected in parallel is connected to one end of the fifth resistor R5 and the third capacitor C3.

[0012] In one possible implementation, the housing is rectangular.

[0013] In one possible implementation, the housing is annular.

[0014] In one possible implementation, the housing is provided with a volume control element for adjusting the volume.

[0015] In one possible implementation, the external casing of the sound-transmitting air tube is covered with a sound-insulating layer.

[0016] In one possible implementation, the earplug includes an earplug body and an earplug head, with one end of the earplug head fitted onto the earplug body and the other end of the earplug body fitted onto the other end of the sound transmission tube, so that sound is transmitted to the target user's ear through the sound transmission tube.

[0017] In one possible implementation, the earplug is conical, and the diameter of the earplug gradually increases towards the sound-generating module; the length of the sound-transmitting air tube is 30cm to 100cm, and the inner diameter of the sound-transmitting air tube is 1mm to 5mm.

[0018] This application provides a noise-canceling headset for magnetic resonance imaging (MRI) examination. By using a sound-generating module, the sound signal emitted by an external user through an external terminal is processed and transmitted to an earplug noise-canceling module. While ensuring that noise is blocked by the earplug, the sound can be transmitted to the target user's ear through the air-transmitting tube to complete the interaction. The user can also send their own voice to an external user through the microphone on the MRI device, achieving the technical effect of improving noise reduction while ensuring high communication quality. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0020] Figure 1 A schematic diagram of the overall structure of a noise-canceling headphone for magnetic resonance imaging provided in this application;

[0021] Figure 2 This is a schematic diagram of the internal structure of a sound-generating module provided in an embodiment of this application;

[0022] Figure 3 A circuit connection diagram of a signal equalization processing unit provided in an embodiment of this application;

[0023] Figure 4 A cross-sectional view of a sound-transmitting trachea provided for an embodiment of this application;

[0024] Figure 5 This is a schematic diagram illustrating the structure of an earplug, provided as an embodiment of this application.

[0025] Figure label:

[0026] 1-Sound generating module; 101-Sound duct; 102-Micro sound generating unit; 103-Signal equalization processing unit; 104-Impedance matching duct; 105-Housing; 106-Volume adjustment component;

[0027] 21-Earplug; 211-Earplug body; 212-Earplug tip.

[0028] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0030] Among related technologies, active noise-canceling headphones have been attempted, which use microphones to collect noise and a chip to generate an inverted wave for cancellation. This process takes time (system latency). For mid-to-high frequency sounds with very short wavelengths and rapid changes, the system cannot react in time, resulting in the generated anti-noise wave not being able to accurately match and cancel the noise, leading to poor noise reduction performance.

[0031] There is also a one-way communication mode for MRI scans, where the patient passively receives instructions from the technician. If the patient experiences discomfort, they cannot promptly report it to the technician, posing a safety risk. This MRI solution addresses this by implementing a two-way communication mode, allowing real-time communication between the patient and technician. This effectively alleviates anxiety and discomfort, significantly improving both the comfort and safety of the examination.

[0032] To solve the above problems, the inventors proposed the following inventive concept:

[0033] The system first processes the external user's voice signal through the sound-generating module and then transmits it through the sound-transmitting tube. Simultaneously, external personnel can receive the target user's voice through the microphone built into the MRI machine, achieving high-quality two-way communication and enhancing the target user's sense of security during the MRI examination. Furthermore, the earplugs effectively block most of the noise inside the MRI room from entering the target user's ears, providing excellent noise reduction.

[0034] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0035] Figure 1 This application provides a schematic diagram of the overall structure of a noise-canceling headphone for magnetic resonance imaging (MRI) examination. Figure 1 As shown in the figure, this application provides a noise-canceling headphone for magnetic resonance imaging (MRI) examination, including: a sound-generating module 1 and an earplug noise-canceling module 2.

[0036] The input terminal of the sound-generating module 1 is connected to an external terminal, which is used to transmit the sound signal emitted by the external user through the external terminal to the earplug noise reduction module 2 after preprocessing, so that the sound pressure frequency response curve of the sound entering the ear meets the preset flat condition.

[0037] The earplug noise reduction module 2 includes an earplug 21 and a sound transmission tube 22. The earplug 21 is inserted into the ear canal of the target user. One end of the sound transmission tube 22 is connected to the output end of the sound generation module 1, and the other end of the sound transmission tube 22 passes through the earplug 21 and is used to transmit the sound of the external user into the ear of the target user.

[0038] In this embodiment, the sound-generating module 1 can be a sound signal processor that converts electrical signals into sound signals, ensuring that subsequent sound transmission is not affected by magnetic fields. The input terminal of the sound-generating module 1 can be electrically connected to an external terminal via a wire to receive electrical signals sent by the external terminal. After processing by the sound-generating module 1, the electrical signals are converted into sound waves and transmitted to the subsequent sound transmission conduit 22.

[0039] Figure 2 This is a schematic diagram of the internal structure of a sound-generating module provided in an embodiment of this application.

[0040] Please refer to Figure 2 Specifically, in an optional embodiment of this application, the sound-generating module 1 includes: a sound conduit 101, a micro-sound-generating unit 102, a signal equalization processing unit 103, an impedance matching conduit 104, and a housing 105.

[0041] The output end of the acoustic conduit 101 is connected to the input end of the sound transmission duct 22, the input end of the micro-sound-generating unit 102 is electrically connected to the signal equalization processing unit 103, and the output end of the micro-sound-generating unit 102 is connected to both the acoustic conduit 101 and the impedance matching conduit 104. The input end of the signal equalization processing unit 103 is connected to an external terminal; the output end of the impedance matching conduit 104 is connected to the acoustic conduit 101; the acoustic conduit 101, the micro-sound-generating unit 102, the signal equalization processing unit 103, and the impedance matching conduit 104 are all integrated and installed within the housing 105.

[0042] In this embodiment, the acoustic conduit 101 can be a tubular structure made of non-magnetic metal tubes such as stainless steel or copper. The acoustic conduit 101 is specifically used to seal and conduct the sound waves emitted by the micro sound-generating unit 102 into the acoustic conduit 22.

[0043] The micro-sound-generating unit 102 can be a MEMS-piezoelectric, electrostatic, or other non-magnetic sound-generating element. The input terminal of the micro-sound-generating unit 102 receives the signal obtained after the electrical signal is processed by the signal uniformity processing unit 103, and is then driven to emit sound waves. The output terminal of the micro-sound-generating unit 102 is connected to the input terminals of both the acoustic conduit 101 and the impedance matching conduit 104.

[0044] In this embodiment, the signal equalization processing unit 103 can be a signal processing circuit board for processing electrical signals, mainly including resistors, capacitors, and signal input connectors, such as a 3.5 mm audio jack. Specifically, the signal equalization processing unit 103 is used to filter and equalize the electrical signals received from external terminals. These electrical signals may contain information that the external user wants to convey. This ensures that the final sound intensity reaching the human ear does not fluctuate significantly with different frequencies, resulting in a flatter sound pressure frequency response curve, improving the quality of external sound received by the user, and enhancing the user experience.

[0045] Figure 3 This is a circuit connection diagram of a signal equalization processing unit provided in an embodiment of this application.

[0046] Please refer to Figure 3 In an optional embodiment of this application, the signal equalization processing unit 103 specifically includes: a first resistor R1, a first capacitor C1, a second resistor R2, an operational amplifier U1, a third resistor R3, a second capacitor C2, a gain amplifier U2, a fifth resistor R5, and a third capacitor C3.

[0047] An external terminal is connected to one end of a first resistor R1. The other end of the first resistor R1 is connected to one end of a first capacitor C1 and a second resistor R2. The first capacitor and the second resistor R2 are connected in parallel. The other ends of the first resistor R1 and the first capacitor C1 are both connected to the input terminal of operational amplifier U1. The output terminal of operational amplifier U1 is connected to one end of a second capacitor C2 and a third resistor R3. The second capacitor C2 and the third resistor R3 are connected in parallel, and the other ends of the second capacitor C2 and the third resistor R3 are both connected to the input terminal of gain amplifier U2.

[0048] The output of the gain amplifier U2 is connected to one end of the fifth resistor R5 and the third capacitor C3. The fifth resistor R5 and the third capacitor C3 are connected in parallel. The output of the parallel connection of the fifth resistor R5 and the third capacitor C3 is connected to the input of the micro-sound unit.

[0049] In this embodiment, the first resistor R1 can be a non-magnetic chip resistor, such as a 10KΩ non-magnetic chip resistor, used for input current limiting. The first resistor R1 limits the current of the external input electrical signal to prevent signal overload from burning out the subsequent active devices; at the same time, it matches the audio output impedance of the external terminal to reduce signal reflection.

[0050] The first capacitor C1 can be a ceramic capacitor, such as a 1μF non-magnetic chip ceramic capacitor. The first capacitor C1 is used to filter out the DC component in the external input signal (audio signals are AC signals, and DC will cause abnormal bias of active devices), allowing only the AC audio signal to pass; it also assists in the conduction of low-frequency signals, preparing for subsequent bandpass filtering.

[0051] The second resistor R2 can also be a non-magnetic patch resistor and its resistance value can be the same as that of the first resistor R1. The second resistor R2, together with the first capacitor C1 and the first resistor R1, forms a front-stage RC frequency selection network for an active bandpass filter. For example, the high-pass cutoff frequency of the bandpass filter is defined as 200Hz, while providing a stable bias voltage for the non-inverting input of the operational amplifier U1.

[0052] The aforementioned electronic components form the preamplifier circuit for operational amplifier U1. Utilizing the characteristics of the first capacitor C1, the DC component is completely blocked by C1, preventing it from entering subsequent stages. Low frequencies below 200Hz are attenuated by the voltage division of the first resistor R1 and the second resistor R2 due to the relatively large capacitive reactance of C1, making them difficult to pass. Audio signals above 200Hz can pass without attenuation due to the smaller capacitive reactance of C1, and are sent to the signal input of operational amplifier U1, preparing for subsequent precise bandpass filtering.

[0053] Operational amplifier U1 can be a non-magnetic patch operational amplifier. Operational amplifier U1, together with the third resistor R3 and the second capacitor C2, forms an active bandpass filter. Operational amplifier U1 is the core amplification device of this active bandpass filter, providing active gain for the RC frequency selection network, solving the signal attenuation problem of passive RC filtering, so as to ensure distortion-free audio signal processing and adapt to the low interference requirements of the magnetic resonance MRI environment.

[0054] In this embodiment, the third resistor R3 can be a non-magnetic surface-mount resistor, and the resistance value of the third resistor R3 is less than that of the first resistor R1 or the second resistor R2. For example, the resistance value of the third resistor R3 can be 1kΩ. The third resistor R3 and the second capacitor C2 together form a low-pass RC frequency selection network for active bandpass filtering. In this embodiment, it is assumed that the low-pass cutoff frequency is 8kHz. At the same time, the third resistor R3 also serves as the feedback resistor for the operational amplifier U1, stabilizing the gain and operating state of the operational amplifier U1. The second capacitor C2 can be a non-magnetic surface-mount ceramic capacitor. The second capacitor C2 is used to filter out high noise above 8kHz and suppress radio frequency electromagnetic noise in the MRI environment, such as high-frequency whistling generated by gradient coil switching, to prevent noise interference with the audio signal and improve audio quality.

[0055] The active bandpass filter, composed of operational amplifier U1, third resistor R3, and second capacitor C2, achieves precise gating of the core speech frequency band from 200Hz to 8kHz, filtering out more unwanted noise in the MRI environment and providing a clean signal source for subsequent frequency response supplementation.

[0056] Gain amplifier U2 can be a programmable gain amplifier, such as a non-magnetic patch programmable gain amplifier, used to provide precise adjustable gain compensation of 0 to 12 dB for the attenuation frequency band (2 to 4 kHz) transmitted by the acoustic conduit 101 of the sound generation module 1. It can adapt to different transmission attenuation characteristics of the acoustic conduit 101 by preset supplementary gain, and linearly adjust the gain at the full frequency end, only compensating for the attenuation frequency band without changing the signal strength of other frequency bands.

[0057] Based on the above embodiments, as an optional embodiment of this application, a circuit structure for adjusting the volume is further provided after the gain amplifier U2. Please refer to [the documentation for further details]. Figure 3 The signal equalization processing unit 103 also includes a fourth resistor R4 and a potentiometer VR1. The output terminal of the gain amplifier U2 is connected to one end of the fourth resistor R4 and the potentiometer VR1. The fourth resistor R4 and the potentiometer VR1 are connected in parallel. The output terminal of the fourth resistor R4 and the potentiometer VR1 connected in parallel is connected to one end of the fifth resistor R5 and the third capacitor C3.

[0058] In this embodiment, the fourth resistor R4 can be a non-magnetic surface-mount resistor, and its resistance value can be the same as that of the first resistor R1. The potentiometer VR1 can be a non-magnetic linear potentiometer. The fourth resistor R4 and the potentiometer VR1 work together to form a voltage divider network for volume adjustment, limiting the adjustment range of VR1, preventing signal overload when the volume is turned up to the maximum, and providing stable impedance matching for volume adjustment to avoid signal reflection during adjustment. A fixed voltage division ratio ensures the linearity of volume adjustment.

[0059] In this embodiment, the potentiometer VR1 can be a mechanical passive adjustment device. By rotating or moving it in parallel, its resistance value can be adjusted to change the voltage division ratio of the audio signal, thereby achieving proportional volume adjustment across the entire frequency band.

[0060] In this embodiment, the fifth resistor R5 can be a non-magnetic chip resistor such as 820Ω or 3.3kΩ. The fifth resistor R5 is based on the nominal impedance of the micro-sound unit 102 to accurately match the circuit output impedance with the input impedance of the micro-sound unit 102, avoid signal reflection, and limit the current flowing into the micro-sound unit 102 to prevent the micro-sound unit 102 from being overloaded and burned out.

[0061] The third capacitor C3 can be a non-magnetic chip ceramic capacitor, which assists in impedance matching to compensate for the capacitive impedance of the micro-sound unit 102, ensuring impedance matching consistency across the entire frequency band. At the same time, it blocks DC to prevent small DC components in the circuit from entering the micro-sound unit 102 and causing diaphragm bias.

[0062] Thus, the raw audio electrical signal input from the external terminal, after being processed by the signal equalization processing unit 103, becomes a pure audio signal with consistent intensity across all frequency bands (200Hz to 8kHz), impedance matching, and adjustable volume. This drives the micro-sound generator to produce a sound wave with a flat frequency response. The sound wave is then conducted through the acoustic conduit 101 to the earbud noise reduction module and finally into the ear. The sound pressure frequency response curve fluctuation is ≤±3dB, solving the sound distortion problems caused by noise interference, conduit transmission attenuation, and impedance mismatch in the MRI environment. Furthermore, the earbud noise reduction module can reduce noise before the final sound reaches the ear. Simultaneously, the acoustic conduit in the earbud noise reduction module directly transmits the sound wave signal, rather than an electrical signal, avoiding the influence of magnetic fields on sound quality. This synergistically improves the sound quality reaching the ear, enhancing the user experience.

[0063] In this embodiment, the impedance matching conduit 104 can be made of silicone. The impedance matching conduit 104 and the acoustic conduit 101 work together. The sound waves generated by the micro-sound generator 102 propagate in two opposite directions to the acoustic conduit 101 and the impedance matching conduit 104. When the diaphragm of the micro-sound generator 102 bends towards the acoustic conduit 101 due to an electrical signal, it forms a sparse wave, causing the air inside the impedance matching conduit 104 to vibrate, forming a reverse sound wave that propagates towards the end of the impedance matching conduit 104. The bidirectional vibration of the diaphragm of the micro-sound generator 102 is synchronous, of the same frequency, and out of phase. Therefore, the sound waves radiated towards the acoustic conduit 101 and the impedance matching conduit 104 have the same frequency and complementary sound energy, and the total sound energy is equal to the total energy of the diaphragm vibration (without additional energy loss).

[0064] In addition, the RC filter / PGA gain compensation of the signal equalization processing unit 103 is precisely calibrated for the acoustic energy transmission characteristics of the acoustic duct 101 to compensate for the slight transmission attenuation of the acoustic duct 101. Meanwhile, the impedance matching of the impedance matching duct 104 allows the electrical signal compensation of the signal equalization processing unit 103 and the acoustic energy radiation of the micro-sound generating unit 102 to form an electro-acoustic synergy, ultimately achieving frequency response flattening.

[0065] In this embodiment, the housing 105 can be a square box made of non-magnetic materials such as non-magnetic plastic or ceramic. The housing 105 can specifically include a top cover and a box body. The top cover and the box body can be fixedly connected by bolts. After the top cover and the box body are fixedly connected, an internal cavity is formed. This cavity is used to integrate a part of the acoustic conduit 101, the micro-sound generation unit 102, the signal equalization processing unit 103, and the impedance matching conduit 104.

[0066] In an optional embodiment of this application, a sealing gasket is also provided between the top cover of the housing 105 and the box body to improve the sealing and sound insulation effect of the housing 105.

[0067] Based on the above embodiments, in an optional embodiment of this application, the housing 105 of the sound-generating module 1 is rectangular.

[0068] In this embodiment, the rectangular housing 105 is easy to manufacture and can reduce the user's usage cost.

[0069] Furthermore, in an optional embodiment of this application, the housing 105 of the sound-generating module 1 can also be ring-shaped, allowing it to be directly worn on the user's wrist in the form of a bracelet, thus improving ease of use and stability.

[0070] In an optional embodiment of this application, a volume control 106 is provided on the housing 105. The volume control 106 can be a volume knob or a volume slider. In this embodiment, the volume control 106 on the housing 105 is located on the side of the housing 105, making it convenient for the user to adjust the resistance of the potentiometer VR1 by rotating the volume control 106, thereby adjusting the volume.

[0071] Figure 4 A cross-sectional view of a sound transmission trachea provided for an embodiment of this application.

[0072] Please refer to Figure 4 Based on the above embodiments, in an optional embodiment of this application, the external surface of the sound-transmitting air tube 22 is covered with a sound-insulating layer 221. The sound-insulating layer 221 can be made of sound-insulating cotton, and can be formed by wrapping the sound-insulating cotton around the outer surface of the sound-transmitting air tube 22. The sound-insulating layer 221 can further prevent noise from entering the sound-transmitting air tube 22 and affecting the transmission of sound wave signals, thereby reducing the impact of noise and improving the sound quality of the sound entering the ear.

[0073] Figure 5 This is a schematic diagram illustrating the structure of an earplug, provided as an embodiment of this application.

[0074] Please refer to Figure 5 In an optional embodiment of this application, the earplug 21 includes an earplug body 211 and an earplug head 212. One end of the earplug head 212 is fitted onto the earplug body 211, and the other end of the earplug body 211 is fitted onto the other end of the sound transmission tube 22, so that the sound is transmitted to the target user's ear through the sound transmission tube 22.

[0075] In this embodiment, the earplug body 211 can be a column made of sponge or silicone. The earplug body 211 has a through hole along the central axis for the sound transmission tube 22 to pass through. The end of the sound transmission tube 22 passes through one end of the earplug body 211 and then passes through the other end of the earplug body 211, with a part of the tube protruding for the earplug head 212 to be fitted.

[0076] Please continue to refer to this. Figure 1In this embodiment, the earplug cover 212 can be made of silicone material and is similar in size to the human ear canal. The size of the earplug cover 212 can be set according to the usage needs of different users. The earplug cover 212 has a through hole for the end of the sound transmission tube 22 to pass through, so that the volume is concentrated in the earplug cover and transmitted to the user's ear canal after passing through the sound transmission tube 22. The earplug cover 212 can improve the user's comfort, convenience and cost of use, and different users only need to replace different earplug covers 212.

[0077] In an optional embodiment of this application, the earplug body 211 is conical, and the diameter of the earplug body 211 gradually increases towards the sound-generating module 1; the length of the sound transmission tube 22 is 30cm to 100cm, and the inner diameter of the sound transmission tube 22 is 1mm to 5mm.

[0078] To facilitate understanding of the implementation principle of the noise-canceling headphones for magnetic resonance imaging (MRI) examination, the specific use of a noise-canceling headphone for MRI examination provided in this application embodiment is as follows:

[0079] First, the target user fixes the sound-generating module 1 to a position on or next to their body. Then, they select an earplug 212 of suitable size and place it over the part of the sound transmission tube 22 that protrudes from the end of the earplug body 211, ensuring the earplug 212 fits snugly against the sound transmission tube 22. Next, the user puts the earplug 21 in their ear and lies down on the MRI scanner. When an external user sends voice information via an external terminal, the voice information is transmitted as an electrical signal through a wire into the sound-generating module 1. This signal is then processed by the signal equalization processing unit 103. The processed electrical signal drives the micro-sound-generating unit 102 to emit sound waves. The sound waves emitted by the micro-sound-generating unit 102 propagate in two opposite directions: the sound transmission tube 101 and the impedance matching tube 104. The earplug 21 at the ear canal end connected to the sound transmission tube 101 forms a sealed acoustic cavity. This cavity, combined with the directional propagation of the impedance matching tube 104, creates dual standing wave suppression: the sealed end suppresses reflections, and the reverse end absorbs excess sound energy, resulting in a more stable frequency response curve. To provide users with more stable, clear, and high-quality sound, thereby accurately and clearly receiving the information that external users want to express, in order to reassure the target users and guide them to better receive MRI examinations.

[0080] When the target user needs to describe their feelings or other information to an external user, the device's built-in microphone can receive the target user's voice signal and transmit it to the external user's external terminal, enabling real-time two-way communication between the two parties and improving the safety of the MRI examination process and the user experience.

[0081] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A noise-canceling headphone for magnetic resonance imaging (MRI) examination, characterized in that, include: Sound generation module and earplug noise reduction module; The input end of the sound-generating module is connected to an external terminal, which is used to transmit the sound signal emitted by the external user through the external terminal to the earplug noise reduction module after preprocessing, so that the sound pressure frequency response curve of the sound entering the ear meets the preset flat condition. The earplug noise reduction module includes an earplug and a sound transmission tube. The earplug is inserted into the ear canal of the target user. One end of the sound transmission tube is connected to the output end of the sound-generating module, and the other end of the sound transmission tube passes through the earplug and is used to transmit the voice of the external user into the ear of the target user.

2. The noise-canceling headphones for magnetic resonance imaging (MRI) according to claim 1, characterized in that, The sound-generating module includes: a sound duct, a micro-sound-generating unit, a signal equalization processing unit, an impedance matching duct, and a housing; The output end of the acoustic conduit is connected to the input end of the acoustic air tube, the input end of the micro-sound-generating unit is electrically connected to the signal equalization processing unit, and the output end of the micro-sound-generating unit is connected to both the acoustic conduit and the impedance matching conduit. The input terminal of the signal equalization processing unit is connected to the external terminal; The output end of the impedance matching conduit is connected to the acoustic conduit. The acoustic conduit, micro-sound generator, signal equalization processing unit, and impedance matching conduit are all integrated and installed within the housing.

3. The noise-canceling headphones for magnetic resonance imaging (MRI) according to claim 2, characterized in that, The signal equalization processing unit includes a first resistor R1, a first capacitor C1, a second resistor R2, an operational amplifier U1, a third resistor R3, a second capacitor C2, a gain amplifier U2, a fifth resistor R5, and a third capacitor C3. The external terminal is connected to one end of the first resistor R1, and the other end of the first resistor R1 is connected to one end of the first capacitor C1 and the second resistor R2. The first capacitor and the second resistor R2 are connected in parallel. The other ends of the first resistor R1 and the first capacitor C1 are both connected to the input terminal of the operational amplifier U1. The output terminal of the operational amplifier U1 is connected to one end of the second capacitor C2 and the third resistor R3. The second capacitor C2 and the third resistor R3 are connected in parallel, and the other ends of the second capacitor C2 and the third resistor R3 are both connected to the input terminal of the gain amplifier U2. The output terminal of the gain amplifier U2 is connected to one end of the fifth resistor R5 and the third capacitor C3. The fifth resistor R5 and the third capacitor C3 are connected in parallel. The output terminal of the fifth resistor R5 and the third capacitor C3 connected in parallel is connected to the input terminal of the micro-sound unit.

4. The noise-canceling headphones for magnetic resonance imaging according to claim 3, characterized in that, The signal equalization processing unit further includes: a fourth resistor R4 and a potentiometer VR1; The output of the gain amplifier U2 is connected to one end of the fourth resistor R4 and the potentiometer VR1. The fourth resistor R4 and the potentiometer VR1 are connected in parallel, and the output of the fourth resistor R4 and the potentiometer VR1 connected in parallel is connected to one end of the fifth resistor R5 and the third capacitor C3.

5. The noise-canceling headphones for magnetic resonance imaging according to claim 2, characterized in that, The shell is rectangular.

6. The noise-canceling headphones for magnetic resonance imaging according to claim 2, characterized in that, The shell is annular.

7. The noise-canceling headphones for magnetic resonance imaging according to claim 5 or 6, characterized in that, The housing is equipped with a volume control element, which is used to adjust the volume.

8. The noise-canceling headphones for magnetic resonance imaging (MRI) according to claim 1, characterized in that, The external casing of the sound-transmitting air tube is covered with a sound-insulating layer.

9. The noise-canceling headphones for magnetic resonance imaging (MRI) according to claim 1, characterized in that, The earplug includes an earplug body and an earplug head. One end of the earplug head is fitted onto the earplug body, and the other end of the earplug body is fitted onto the other end of the sound transmission tube, so that sound is transmitted to the target user's ear through the sound transmission tube.

10. The noise-canceling headphones for magnetic resonance imaging according to claim 9, characterized in that, The earplug is conical, and its diameter gradually increases towards the sound-generating module; the length of the sound-transmitting air tube is 30cm to 100cm, and its inner diameter is 1mm to 5mm.

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