CN107564509B - Noise reduction system - Google Patents
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- CN107564509B CN107564509B CN201710993442.4A CN201710993442A CN107564509B CN 107564509 B CN107564509 B CN 107564509B CN 201710993442 A CN201710993442 A CN 201710993442A CN 107564509 B CN107564509 B CN 107564509B
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Abstract
The present invention relates to a noise reduction system for reducing noise generated by medical imaging equipment between scans. The noise reduction system sends a noise reduction signal corresponding to the noise signal to the target area according to the detected noise signal so as to reduce or offset the noise generated by the medical imaging equipment in the target area. The noise reduction system is used for reducing the noise of a target area in real time, namely, the directional noise reduction is carried out on the noise in a scanning room, the noise reduction is targeted, the implementation is easy, the noise reduction effect is good, and the noise protection effect on personnel is good.
Description
Technical Field
The invention relates to the technical field of medical imaging equipment, in particular to a noise reduction system.
Background
Medical imaging devices can generate noise that can be uncomfortable to the patient during use. In some medical imaging devices, such as superconducting magnetic resonance systems, noise generated by the switching of the gradient field is transmitted to the patient in the scanning channel through air or mechanical vibration of components, and the noise not only causes discomfort and stress to the patient, affects the quality of the magnetic resonance imaging, and may even cause permanent damage to the human hearing. Accordingly, medical imaging devices today are often provided with noise reduction systems, for example, by providing sound insulation in the medical imaging device to minimize noise transmission from the medical imaging device to other areas to provide noise protection for the patient and possibly the operator between scans. However, the noise reduction effect of the existing noise reduction system is not ideal.
Disclosure of Invention
Therefore, it is necessary to provide a noise reduction system for solving the problem that the conventional noise reduction system has a poor noise protection effect on the personnel in the scanning room.
A noise reduction system is used for reducing noise generated by a medical imaging device in a scanning room, and the noise reduction system sends a noise reduction signal corresponding to a noise signal to a target area according to the detected noise signal so as to reduce or cancel the noise generated by the medical imaging device in the target area.
The noise reduction system is used for reducing the noise of a target area in real time, namely, the directional noise reduction is carried out on the noise in a scanning room, the noise reduction is targeted, the implementation is easy, the noise reduction effect is good, and the noise protection effect on personnel is good.
In one embodiment, the noise reduction system comprises a noise sensing module, a positioning module, a noise reduction module and a control module; the noise sensing module is used for sensing the sound wave in real time and outputting a sensing signal; the positioning module is used for detecting the position of the target area in real time and outputting the position information of the target area; and when the control module identifies that the induction signal is a noise signal, the control module controls the noise reduction module to send a noise reduction signal corresponding to the noise signal to the target area in the scanning room in real time according to the noise signal and the position information of the target area.
In one embodiment, the noise reduction system further includes a driving unit, the driving unit is connected to the control module and the noise reduction module respectively, and the driving unit drives the noise reduction module to face the target area according to a driving instruction of the control module.
In one embodiment, the noise reduction module comprises a main noise reduction unit and an auxiliary noise reduction unit, and the main noise reduction unit and the auxiliary noise reduction unit are respectively connected to the control module; the main noise reduction unit is used for reducing noise of a scanning area defined by the medical imaging equipment; and the auxiliary noise reduction unit is used for reducing noise of the areas except the scanning area in the scanning room.
In one embodiment, the primary noise reduction unit and the secondary noise reduction unit each comprise an acoustic generator for emitting the noise reduction signal corresponding to the noise.
In one embodiment, the noise sensing module comprises a main noise sensing unit and an auxiliary noise sensing unit; the main noise induction unit is arranged in a scanning area of the medical imaging equipment and used for inducing sound waves in the scanning area and outputting induction signals; the auxiliary noise sensing unit is arranged outside the scanning area and used for sensing sound waves outside the scanning area and outputting sensing signals; the main noise sensing unit and the auxiliary noise sensing unit are respectively connected with the control module; the control module generates noise sound field distribution information according to the sensing signals output by the main noise sensing unit and the auxiliary noise sensing unit, and controls the noise reduction module to send the noise reduction signal according to the noise sound field distribution information and the position information.
In one embodiment, the control module comprises a judging unit and a control unit; the judging unit receives the induction signal, and judges whether the induction signal is a noise signal or not by comparing the frequency of the induction signal with a preset threshold value; the control unit is connected with the judging unit, and controls the noise reduction module to send out a noise reduction signal when the judging unit judges that the induction signal is a noise signal.
In one embodiment, the noise reduction system further comprises a template storage unit, and the template storage unit is connected with the control module; the template storage unit is used for pre-storing information templates of the noise reduction signals corresponding to the scanning protocols of the medical imaging equipment; the control module controls the noise reduction module to reduce noise according to the information template corresponding to the scanning protocol executed by the medical imaging equipment.
In one embodiment, the noise reduction system further comprises a noise reduction optimization unit; the noise reduction optimization unit is respectively connected with the noise induction module, the positioning module and the template storage unit, and generates noise reduction optimization signals according to induction signals which are induced by the noise induction module in real time when the medical imaging equipment works and position information of the target area which is output by the positioning module.
In one embodiment, the information of the noise signal comprises a frequency, a phase or a magnitude of the noise; the frequency of the noise reduction signal is equal to that of the noise signal, the phase of the noise reduction signal is opposite to that of the noise signal, and the magnitude of the noise reduction signal is equal to that of the noise signal.
According to the noise reduction system provided by the embodiment of the invention, the noise reduction module is controlled in real time to send the noise reduction signal which is opposite to the noise signal correspondingly to the region where the human body is located in the scanning room according to the noise signal generated by the medical imaging equipment and the position information of the human body, so that the noise generated by the medical imaging equipment in the region where the human body is located is offset or reduced, the interference of the noise generated by the medical imaging equipment to a scanned patient in the scanning process is relieved, and the hearing of the patient is effectively protected.
Drawings
Figure 1 is a schematic diagram of a magnetic resonance imaging system;
FIG. 2 is a schematic view of a noise reduction system of the first embodiment;
FIG. 3 is a block diagram of the noise reduction system shown in FIG. 2;
FIG. 4 is a schematic illustration of the noise reduction system of FIG. 3 as applied to the magnetic resonance imaging system of FIG. 1;
FIG. 5 is a schematic view of a noise reduction system of a second embodiment;
fig. 6 is a schematic view of a noise reduction system of a third embodiment.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
A noise reduction system for reducing noise generated by a medical imaging device in a scan room. The medical imaging apparatus may be a medical apparatus having noise generation such as a computed tomography apparatus (CT apparatus), a magnetic resonance imaging apparatus (MR apparatus), a positron emission tomography apparatus (PET apparatus), a PET-CT apparatus, a radiotherapy apparatus (RT apparatus), or the like. The medical imaging apparatus in the present embodiment is exemplified by a magnetic resonance imaging apparatus.
Fig. 1 is a schematic diagram of a magnetic resonance imaging apparatus 100. As shown in fig. 1, the magnetic resonance imaging apparatus 100 includes a main control system and a scanner 130. The main control system is disposed in the operating room 110, and the scanner 130 is disposed in the scanning room 120. The scanner 130 is formed with a through-hole-shaped scanning chamber 131, and the scanning chamber 131 is used to form a scanning space for scanning a portion to be measured of the patient 300. In operation, the scanner 130 is used to deliver the patient 300 into the scanning chamber 131 for scanning. Typically, the staff member controls the scanner 130 in the operating room 110, so that the scanner 130 scans and images the patient 300. An operator 400 may also be located within the scanning booth 120 to assist in positioning the patient 300 or operating the scanner 130, if desired.
As background, during operation of the magnetic resonance imaging apparatus 100, the scanner 130 may generate noise that may be uncomfortable to the patient 300 and/or the operator 400. Therefore, the present embodiment provides a noise reduction system 200 to reduce the noise generated by the scanner 130 in the scan room 120.
The noise reduction system 200 sends a noise reduction signal corresponding to the noise signal to the target region according to the detected noise signal, so as to reduce or cancel the noise generated by the magnetic resonance imaging apparatus 100 in the target region. In this embodiment, the target area is the area within the scan room 120 where the patient 300 and/or the operator 400 are located.
Fig. 2 is a schematic diagram of a noise reduction system 200 of a first embodiment. As shown in FIG. 2, noise reduction system 200 includes a noise sensing module 210, a positioning module 220, a noise reduction module 230, and a control module 240. The noise sensing module 210 is disposed in the scan room 120, and the noise sensing module 210 is configured to sense a sound wave in the scan room in real time and output a sensing signal. The positioning module 220 is disposed in the scanning room 120, and the positioning module 220 is used for detecting the position of the human body in the scanning room 120 in real time and outputting position information. The noise reduction module 230 is disposed in the scan room 120. The control module 240 is connected to the noise sensing module 210, the positioning module 220, and the noise reduction module 230, respectively. The control module 240 receives the sensing signal and the position information, and when recognizing that the sensing signal is a noise signal, the control module 240 controls the noise reduction module 230 to send a noise reduction signal corresponding to the noise signal to the region of the scan room 120 where the human body is located according to the noise signal and the position information of the human body in real time, so as to cancel or reduce the noise generated by the magnetic resonance imaging apparatus in the region of the human body.
The noise sensing module 210 and the positioning module 220 of the noise reduction system 200 are disposed in the scan room 120. The control module 240 controls the noise reduction module 230 to send a noise reduction signal corresponding to the noise to the region of the scan room 120 where the human body is located according to the real-time noise signal and the position information of the human body. That is, the position of the human body in the scan room 120 is the target area, and the noise reduction module 230 directionally sends out the noise reduction signal corresponding to the noise to the target area in real time, so as to reduce or eliminate the noise generated by the operation of the medical imaging device in the scan room 120. In this way, the noise reduction system 200 performs noise reduction on the noise in the region where the human body is located in real time, that is, performs directional noise reduction on the noise in the scanning room 120, and has pertinence in noise reduction, so that not only is the implementation easy, but also the noise reduction effect is good, and the noise protection effect on the human body is good.
In the present embodiment, the connection between the modules may be direct connection between the modules, or indirect connection between the modules through intermediate modules or elements.
In one embodiment, the positioning module 220 may output a plurality of position information, that is, the scan room 120 may be positioned by the positioning module 220 when there are other persons besides the patient 300. The control module 240 may control the noise reduction module 230 to perform directional noise reduction processing on each location according to the location information of the location module 220 in combination with the received noise signal. That is, the noise reduction system 200 can protect all the persons in the scanning room 120, so that the noise protection effect is good. Alternatively, the control module 240 may selectively perform noise reduction processing on some positions in the scan room according to the position information of the positioning module 220, so as to improve the working efficiency of the noise reduction system 200.
Fig. 3 is a block diagram of the noise reduction system 200 shown in fig. 2. As shown in fig. 3, the noise reduction system 200 further includes a noise amplification module 260, a conversion module 270, and a noise processing module 250. The noise sensing module 210, the noise amplifying module 260, the converting module 270, the noise processing module 250 and the control module 240 are connected in sequence.
The noise amplification module 260 is used for amplifying the sensing signal.
The conversion module 270 is used for converting the sensing signal into a digital signal. Generally, the sensing signal is an analog signal, which is converted into a digital signal by the conversion module 270. Specifically, the conversion module 270 includes an analog-to-digital converter to convert the sensing signal from an analog signal to a digital signal.
The noise processing module 250 receives and analyzes the sensing signal, and the noise processing module 250 outputs sound wave information. The noise processing module 250 analyzes the sensing signal and outputs characteristic information of the sensing signal, so that the control module 240 accurately identifies whether the sensing signal is a noise signal according to the characteristic information of the sensing signal. The characteristic information of the induction signal includes the frequency and phase of the acoustic wave. In other embodiments of the present invention, the characteristic information of the sensing signal further includes the intensity of the sound wave, for example, the intensity of the sound wave is described in decibel value.
The control module 240 receives the sound wave information and identifies whether the sensing signal is a noise signal according to the sound wave information. When recognizing that the sensing signal is a noise signal, the control module 240 controls the noise reduction module 230 to send a corresponding noise reduction signal according to the noise signal and the position information of the human body detected by the positioning module 220. The control module 240 determines a characteristic, such as frequency, phase or intensity, which the noise reduction signal should have by analyzing the acoustic wave information and the position information of the human body. The characteristics of the noise reduction signal are then sent to the noise reduction module 230, so that the characteristics of the noise reduction signal can be matched with the noise signal, and the noise reduction effect is good. Specifically, the frequency of the noise reduction signal is equal to the frequency of the noise signal, and the phase of the noise reduction signal is opposite to the phase of the noise signal. The intensity of the noise reduction signal is equal to that of the noise signal, or the intensity of the noise reduction signal can partially offset the noise signal. Specifically, a noise threshold is preset in the control module 240. When the intensity value (decibel value) of the noise is greater than the noise threshold, the control module 240 controls the noise reduction module 230 to start. In this way, the control module 240 can control the noise reduction module 230 to start according to the noise intensity, so as to avoid starting the noise reduction module 230 when the intensity of the noise is very small, thereby saving resources. Further, since the intensity values of the noises generated by the scanner 130 at different positions are different, different noise thresholds are preset in the control module 240 for different positions in the scanning room 120, so as to control the noise reduction module 230 to have different start standards for different positions, thereby achieving reasonable control and saving resources. For example, for a scanning region where the space is relatively blocked, since the patient 300 is prone to stress when the patient 300 needs to receive a scan, the preset noise threshold for the position is small by the control module 240, so that the noise reduction module 230 can timely start to reduce the noise in the region and reduce the noise perceived by the patient 300. For the region outside the scanning region, the space is relatively wide, the noise threshold preset at the position by the control module 240 is relatively large, and when the noise in the region reaches a certain degree, the noise reduction module 230 is restarted to reduce the noise, thereby saving resources.
In one embodiment, the control module 240 includes a determination unit and a control unit. The judging unit receives the induction signal and judges whether the induction signal is a noise signal or not by comparing the frequency of the induction signal with the preset threshold value. The control unit is connected with the judging unit and controls the noise reduction module to send out a noise reduction signal when the judging unit judges that the induction signal is a noise signal. In this way, the control module 240 may also control the noise reduction module 230 to start according to the frequency of the sensing signal, when the frequency of the sensing signal is greater than or equal to the preset threshold, the determining unit determines that the sensing signal is a noise signal, and the control unit starts the noise reduction module 230, so as to save resources.
Fig. 4 is a schematic diagram of the noise reduction system 200 shown in fig. 3 applied to the magnetic resonance imaging system 100 of fig. 1. As shown in fig. 3 and 4, the noise sensing module 210 includes a main noise sensing unit 211 and a sub noise sensing unit 212. The main noise sensing unit 211 is disposed in a scanning region (i.e., a scanning chamber) of the medical imaging apparatus. The main noise sensing unit 211 serves to sense an acoustic wave in a scanning area and output a sensing signal. The auxiliary noise sensing unit 212 is disposed outside the scanning region (i.e., the scanning cavity) of the scanning chamber 120, and the auxiliary noise sensing unit 212 is configured to sense the sound wave outside the scanning cavity and output a sensing signal. The main noise sensing unit 211 and the auxiliary noise sensing unit 212 are respectively connected to the control module 240. In this embodiment, the main noise sensing unit 211 is connected to the control module 240 sequentially through the noise amplifying module 260, the converting module 270, and the noise processing module 250, and the auxiliary noise sensing unit 212 is connected to the control module 240 sequentially through the noise amplifying module 260, the converting module 270, and the noise processing module 250. The control module 240 comprehensively analyzes the sensing signals of the main noise sensing unit 211 and the auxiliary noise sensing unit 212 and outputs noise sound field distribution information, and controls the noise reduction module to send out a noise reduction signal according to the noise sound field distribution information and the position information. Specifically, the noise may be characterized differently in different regions within the scan room 120. For example, the intensity of the noise generated by the scanner 130 is large in the scanning area of the scanner 130. In the non-scanning area outside the scanner 130 in the scan room 120, the intensity of the noise generated by the scanner 130 is small. Therefore, the main noise sensing unit 211 and the sub noise sensing unit 212 are respectively disposed in the scanning area and the non-scanning area within the scanning room 120 to respectively sense noise of different areas. The noise sound field distribution information reflects noise information of different regions in the scan room 120, including information of intensity, frequency, and phase of noise of each region. For example, the noise sound field distribution information may reflect intensity information of noise in different regions within the scan room 120. This results in more comprehensive noise distribution information within the scan room 120. As shown in fig. 4, the main noise sensing unit 211 is disposed in the scanning chamber 131 and mainly used for sensing noise in an area where the patient 300 is located. The number of the auxiliary noise sensing units 212 is one or more, and the auxiliary noise sensing units 212 are disposed in other regions outside the scan chamber 130 in the scan room 120. In this embodiment, the number of the auxiliary noise sensing units is two, and the two auxiliary noise sensing units are respectively disposed at two opposite corners of the scan room 120, and the two auxiliary noise sensing units 212 have a better noise sensing effect on the region outside the scan region in the scan room 120.
It should be noted that, in other embodiments, the position of the main noise sensing unit 211 can be flexibly set according to the requirement. For example, the main noise sensing unit 211 may also be disposed in the scanning region near the region where the head of the human body is located, so as to achieve accurate sensing of the noise that can be sensed by the ears of the human body. In addition, the number and the positions of the auxiliary noise sensing units 212 are not limited to this, and may be set according to actual requirements.
The positioning module 220 includes one or more positioning units 221, and the number of the positioning units 221 is one or more. In this embodiment, the number of the positioning units 221 is multiple, the positioning units 221 are disposed at different positions of the scanning room 120, each positioning unit 221 is connected to the control module 240, and the positioning units 221 position the human body in the scanning room 120 together, so that the positioning units position the human body in the scanning room accurately. In this way, accurate positioning of the body within the scan room 120 is achieved. As shown in fig. 4, in the present embodiment, the number of the positioning units 221 is 4, and the positioning units are respectively located at four corners of the scanning room 120, so that the positioning of the human body is more accurate. In this embodiment, the positioning unit 221 is a camera, that is, the positioning module 220 includes a plurality of cameras, and the plurality of cameras are disposed at different positions between scans.
In other embodiments, the number and the positions of the positioning units 221 are not limited thereto, and may be set according to actual requirements.
As shown in fig. 3 and 4, the noise reduction module 230 includes a main noise reduction unit 231 and an auxiliary noise reduction unit 232. The main noise reduction unit 231 and the auxiliary noise reduction unit 232 are both disposed in the scan room 120, and the main noise reduction unit 231 is used for reducing noise of a scan area defined by the medical imaging device. The auxiliary noise reduction unit 232 is connected to the control module 240, and the auxiliary noise reduction unit 232 is configured to reduce noise in a region of the scan room 120 except for the scan region. The control module 240 is respectively connected to the main noise reduction unit 231 and the auxiliary noise reduction unit 232, and controls the main noise reduction unit 231 and the auxiliary noise reduction unit 232 to operate. Thus, the main noise reduction unit 231 and the auxiliary noise reduction unit 232 are respectively responsible for reducing noise in different areas of the scanning room 120, and noise reduction signals have pertinence and good noise reduction effect.
The number of the main noise reduction units 231 is one or more, and the number of the auxiliary noise reduction units 232 is one or more. In this embodiment, the number of the main denoising units 231 and the number of the auxiliary denoising units 232 are multiple. Each main noise reduction unit 231 performs noise reduction on the scanning area of the scan room 120 in common. The auxiliary noise reduction units 232 collectively reduce noise in regions other than the scan region of the scan room 120. This further enhances the noise reduction effect on the areas of the scan room 120 where a human body may be present. As shown in fig. 4, the number of the main noise reduction units 231 is two, and the two main noise reduction units 231 are both located on an extension line of the axis of the scanning cavity 131 and respectively face two opposite end surfaces of the scanner. Thus, the two main noise reduction units 231 respectively transmit noise reduction signals into the scanning cavity 131 to reduce noise of the scanning area, and the noise reduction effect is good. In other embodiments of the present invention, the main noise reduction unit 231 faces the direction of the main noise sensing unit 211, and transmits a noise reduction signal corresponding to the noise signal to the position of the main noise sensing unit 211 according to the instruction of the control module 240. The number of the auxiliary noise reduction units 232 is two, and the two auxiliary noise reduction units are respectively disposed at two opposite corners of the scan room 120. In this way, the auxiliary noise reduction unit 232 is used to perform noise reduction on the non-scanning area of the scan room 120 in a matching manner, and the noise reduction signal can cover the whole non-scanning area of the scan room 120, so that the noise reduction effect is good.
In this embodiment, the main noise reduction unit 231 and the auxiliary noise reduction unit 232 each include an acoustic generator, and the acoustic generators are configured to emit noise reduction signals corresponding to noise. In this embodiment, the acoustic wave generator is an anti-phase acoustic wave generator for emitting an acoustic wave signal having a phase opposite to that of the noise. The sound wave signal opposite to the phase of the noise is used as a noise reduction signal, the noise reduction signal is superposed with the noise signal, the perception of the human body to the noise can be eliminated, and the noise reduction effect is good. Illustratively, the intensity and frequency of the noise reduction signal correspond to those of the noise signal, so that the noise reduction effect is better.
Fig. 5 is a schematic view of a noise reduction system of a second embodiment. The noise reduction system 500 includes a noise sensing module 510, a positioning module 520, a control module 540, and a noise reduction module 530, and further includes a driving unit 580, the driving unit 580 is connected to the control module 540 and the noise reduction module 530, respectively, and the driving unit 580 drives the noise reduction module 530 toward a target region according to a driving instruction of the control module 540. In this way, the control module 540 sends a driving instruction to the driving unit 580 according to the position information of the target region, so that the driving unit 580 drives the noise reduction module 530 to face. Therefore, the direction of the noise reduction signal sent by the noise reduction module 530 is accurate, and the noise reduction effect is good. Further, the noise reduction module 530 can rotate towards any position between the scans, so that the driving unit 580 receives the driving command and drives the noise reduction module 530 to turn to the target region for noise reduction. In this way, noise reduction can be made flexible.
Fig. 6 is a schematic view of a noise reduction system of a third embodiment. The noise reduction system 600 further comprises a template storage unit 650, the template storage unit 650 being connected to the control module 640. The template storage unit 650 is used to store in advance information templates of the noise reduction signals corresponding to the respective scanning protocols of the medical imaging apparatus. The control module 640 controls the noise reduction module to reduce noise according to an information template corresponding to a scanning protocol executed by the medical imaging apparatus 100. Illustratively, the gradient switching rate and the climbing time corresponding to different scanning protocols are different, so the magnitude of the noise caused by the gradient switching rate and the climbing time is different, when a certain scanning protocol is selected for scanning, the template storage unit 650 stores in advance the noise reduction signal corresponding to the noise signal under the certain scanning protocol, specifically, the noise reduction signal and the noise signal have opposite phases and equal magnitude and frequency. Thus, by pre-storing the information template of the noise reduction signal, when the control module 640 knows that the medical imaging device 100 will or is executing a scanning protocol at present, the noise reduction system can actively control the noise reduction module to send the noise reduction signal without waiting for the sensing signal of the noise sensing module, so that the noise reduction is simple and convenient.
In this embodiment, the noise reduction system 600 further includes a noise reduction optimization unit 660. The noise reduction optimization unit 660 is connected to the noise sensing module 610, the positioning module 660, the control module 640, the template storage unit 650, and the medical imaging apparatus 100, respectively. The noise reduction optimization unit 660 receives the working data of the medical imaging device 100 during working, the sensing signal sensed by the noise sensing module 610 in real time, the position information of the target region output by the positioning module 660, optimizes the information template output by the template storage unit 650, and outputs a noise reduction optimization signal. That is, when the noise signal monitored in real time by the noise sensing module 610 is compared with the noise reduction signal corresponding to the current scanning protocol stored in the template storage unit 650 and exceeds the preset threshold, the noise reduction optimization signal is generated, and the control module 640 receives the noise reduction optimization signal and updates the information template in the template storage unit 650 according to the noise reduction optimization signal. Thus, the control module 640 can optimize the noise reduction algorithm in real time according to the working data of the medical imaging device 100 during operation, the corresponding noise signal information, and the information of the positioning module 660, so as to continuously improve the noise reduction effect.
In an embodiment, the noise reduction optimization unit 660 may be an intelligent optimization unit, and the intelligent optimization unit gradually optimizes the noise reduction system by combining big data through a deep learning algorithm. The big data is not limited to the information template pre-stored in the template storage unit 650, the scanning parameters (e.g. scanning protocol) at each scanning, the noise data sensed by the noise sensing module and corresponding to the scanning parameters, the position information of the target area output by the positioning module and corresponding to the scanning parameters, and the selected noise reduction scheme. And the intelligent optimization unit is combined with the data and optimizes the noise reduction scheme through a deep learning algorithm. Further, the control module 640 updates the information template pre-stored in the template storage unit 650 according to the noise reduction scheme optimized by the intelligent optimization unit, so as to further improve the active noise reduction effect and precision.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A noise reduction system for reducing noise generated by a medical imaging device in a scan room, wherein the noise reduction system sends a noise reduction signal corresponding to a noise signal to a target area according to the detected noise signal to reduce or cancel the noise generated by the medical imaging device in the target area;
the noise reduction system comprises a noise induction module, a positioning module, a noise reduction module and a control module;
the noise sensing module is used for sensing sound waves in the scanning room in real time and outputting sensing signals;
the positioning module is used for detecting the position of the target area in real time and outputting the position information of the target area;
when the control module identifies that the induction signal is a noise signal, the control module controls the noise reduction module to send a noise reduction signal corresponding to the noise signal to the target area in the scanning room in real time according to the noise signal and the position information of the target area;
the positioning module is used for outputting position information of a plurality of target areas;
the noise sensing module comprises a main noise sensing unit and an auxiliary noise sensing unit; the main noise induction unit is arranged in a scanning area of the medical imaging equipment and used for inducing sound waves in the scanning area and outputting induction signals; the auxiliary noise sensing unit is arranged outside the scanning area and used for sensing sound waves outside the scanning area and outputting sensing signals; the main noise sensing unit and the auxiliary noise sensing unit are respectively connected with the control module; the control module generates noise sound field distribution information according to the sensing signals output by the main noise sensing unit and the auxiliary noise sensing unit, and controls the noise reduction module to send out the noise reduction signal according to the noise sound field distribution information and the position information;
the control module is preset with a noise threshold value and is also used for controlling the noise reduction module to start when the noise signal is greater than the noise threshold value; and the noise threshold values corresponding to different positions in the scanning room are different, and the noise threshold value used in the scanning area is smaller than the noise threshold value used outside the scanning area.
2. The noise reduction system according to claim 1, further comprising a driving unit, wherein the driving unit is connected to the control module and the noise reduction module respectively, and the driving unit drives the noise reduction module to face the target area according to a driving instruction of the control module.
3. The noise reduction system of claim 1 or 2, wherein the noise reduction module comprises a main noise reduction unit and an auxiliary noise reduction unit, the main noise reduction unit and the auxiliary noise reduction unit being respectively connected to the control module; the main noise reduction unit is used for reducing noise of a scanning area defined by the medical imaging equipment; and the auxiliary noise reduction unit is used for reducing noise of the areas except the scanning area in the scanning room.
4. The noise reduction system of claim 3, wherein the primary and secondary noise reduction units each comprise an acoustic wave generator for emitting the noise reduction signal corresponding to the noise.
5. The noise reduction system of claim 1, wherein the number of the auxiliary noise inducing units is two, and the auxiliary noise inducing units are respectively disposed at two opposite corners between the scans.
6. The noise reduction system of claim 1, wherein the control module comprises a determination unit and a control unit; the judging unit receives the induction signal, and judges whether the induction signal is a noise signal or not by comparing the frequency of the induction signal with a preset threshold value; the control unit is connected with the judging unit, and controls the noise reduction module to send out a noise reduction signal when the judging unit judges that the induction signal is a noise signal.
7. The noise reduction system of claim 1, further comprising a template storage unit, the template storage unit being connected to the control module; the template storage unit is used for pre-storing information templates of the noise reduction signals corresponding to the scanning protocols of the medical imaging equipment; the control module controls the noise reduction module to reduce noise according to the information template corresponding to the scanning protocol executed by the medical imaging equipment.
8. The noise reduction system according to claim 7, further comprising a noise reduction optimization unit; the noise reduction optimization unit is respectively connected with the noise induction module, the positioning module and the template storage unit, and generates noise reduction optimization signals according to induction signals induced by the noise induction module in real time when the medical imaging device works, position information of the target area output by the positioning module and the information template.
9. The noise reduction system of claim 1, wherein the information of the noise signal comprises a frequency, a phase, or a magnitude of the noise; the frequency of the noise reduction signal is equal to that of the noise signal, the phase of the noise reduction signal is opposite to that of the noise signal, and the magnitude of the noise reduction signal is equal to that of the noise signal.
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| CN108916948B (en) * | 2018-03-08 | 2020-05-01 | 佛山市云米电器科技有限公司 | Active noise reduction range hood and noise reduction method |
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