CN104622470A - Auxiliary hearing protection device and method - Google Patents
Auxiliary hearing protection device and method Download PDFInfo
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- CN104622470A CN104622470A CN201310561216.0A CN201310561216A CN104622470A CN 104622470 A CN104622470 A CN 104622470A CN 201310561216 A CN201310561216 A CN 201310561216A CN 104622470 A CN104622470 A CN 104622470A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/055—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves involving electronic [EMR] or nuclear [NMR] magnetic resonance, e.g. magnetic resonance imaging
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/48—Other medical applications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/72—Signal processing specially adapted for physiological signals or for diagnostic purposes
- A61B5/7203—Signal processing specially adapted for physiological signals or for diagnostic purposes for noise prevention, reduction or removal
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/08—Protective devices for the ears internal, e.g. earplugs
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F11/00—Methods or devices for treatment of the ears or hearing sense; Non-electric hearing aids; Methods or devices for enabling ear patients to achieve auditory perception through physiological senses other than hearing sense; Protective devices for the ears, carried on the body or in the hand
- A61F11/06—Protective devices for the ears
- A61F11/14—Protective devices for the ears external, e.g. earcaps or earmuffs
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Abstract
The invention discloses an auxiliary hearing protection device and method. The auxiliary hearing protection device comprises a noise detecting unit and a noise monitoring unit. The noise detecting unit is used for acquiring noise signals, quantizing the noise signals to be noise level data and outputting the noise level data to the noise monitoring unit. The noise monitoring unit is used for determining the result of a hearing protection measure based on the noise level data. By means of the specific implementing mode, the auxiliary hearing protection device provides an accurate and effective noise risk control and judgment mechanism, and the mechanism is based on the quantitative result and provides information in real time; manual judgment by operating staff is avoided; meanwhile, the noise reduction cost of a magnetic resonance imaging system can be effectively lowered.
Description
Technical field
The present invention relates to magnetic resonance imaging system, particularly comprise hearing protection auxiliary device and the method for magnetic resonance imaging system.
Background technology
Nuclear magnetic resonance (Magnetic Resonance Imaging, MRI) is a kind of technology utilizing magnetic resonance phenomenon to carry out imaging.The principle of magnetic resonance phenomenon mainly comprises: the atomic nucleus comprising odd number proton, the hydrogen nuclei such as, extensively existed in human body, its proton has spin motion, just as a small magnet, and the spin axis of these small magnets does not have certain rule, if applying exterior magnetic field, the magnetic line of force by exterior magnetic field rearranges by these small magnets, be specially and be either parallel or anti-parallel to the both direction arrangement of the exterior magnetic field magnetic line of force, the above-mentioned direction being parallel to the exterior magnetic field magnetic line of force is called positive longitudinal axis, the above-mentioned direction being antiparallel to the exterior magnetic field magnetic line of force is called negative longitudinal axis, atomic nucleus only has longitudinal magnetization component, and this longitudinal magnetization component not only has direction but also have amplitude.Be in the atomic nucleus in exterior magnetic field by radio frequency (Radio Frequency, the RF) pulse excitation of characteristic frequency, make these nuclear spin axiss depart from positive longitudinal axis or negative longitudinal axis, produce resonance, magnetic resonance phenomenon that Here it is.After the above-mentioned nuclear spin axis be excited departs from positive longitudinal axis or negative longitudinal axis, this atomic nucleus is just provided with component of transverse magnetisation.After stopping launching radio-frequency pulse, the atomic nucleus be excited launches echo-signal, progressively discharged in the form of an electromagnetic wave by the energy of absorption, its phase place and energy level all return to the state before exciting, and the echo-signal of being launched by atomic nucleus processes further can rebuild image through space encoding etc.
There are three partial dynamic security risks in the scanning process of magnetic resonance system, i.e. excessive radio-frequency (RF) energy (excessive radio frequency energy, SAR), excessive low-frequency field fluctuation (excessive low frequency field variations, PNS and cardiac stimulation (cardiac stimulation)) and excessive acoustic noise.For SAR and PNS, industry develops corresponding monitoring system based on aspiration test and criteria limit, by monitoring in real time, this type of monitoring system can ensure that SAR and PNS keeps level of security in medical scanning.
But; in existing magnetic resonance imaging system field, acoustic noise in scanning process controls to be still inaccurate and easily chaotic mode: industry suggestion hospital is based on to estimate instead of the noise level (often excessive) of real-time quantization provides hearing conservation and this hearing conservation also often sacrifices the comfort level of patient in scanning process.
Regulation according to standard IEC 60601-2-33: 1) under any circumstance, acoustic noise level should more than the non-weighting peak value of 140dB; 2) any system that can produce higher than 99dB acoustic noise, must take hearing conservation to make acoustic noise for patient lower than 99dB; 3) for the operator of magnetic resonance imaging system, acoustic noise level changes, shown in table specific as follows with working time length.
| Working time (hour) | 24 | 12 | 8 | 4 | 1 |
| Acoustic noise (dB) | 80 | 83 | 85 | 88 | 94 |
At the design aspect of magnetic resonance imaging system, a large amount of R&D work is all dropped in and initiatively reduces on acoustic noise level.Wherein the most effective mode is as Dewar vessel thus the propagation path of isolated acoustic noise by gradient coil.Such as, profit in this way, claim and acoustic noise level can be down to 70dB by Toshiba, is therefore significantly less than the hearing conservation standard that standard IEC 60601-2-33 specifies.But, because the design of complexity and the cost that causes thereof improve and technical limitations, this type of scheme development and universal in face considerable hurdle.The solution of other moderate cost comprises and adds energy absorbing foam, optimizes supporting construction thus reduce vibrations, etc.Acoustic noise can be reduced 20dB by these solutions.But along with the develop rapidly of gradient energy and switching technique, the most strong noise of Novel magnetic resonance imaging system is also more and more higher.Therefore, even if when adopting the noise reduction technology of moderate cost, most of Novel magnetic resonance imaging system still can produce the maximum acoustic noise being far longer than safety margins.
Up to now, the most widely used solution is still and takes passive protection to patient and operator.Because acoustic noise changes with locus and radio frequency sequence; therefore consider from security standpoint; industry generally adopts the mode of clean cut, namely requires operator in whole scanning process for patient takes the hearing conservation of enough (even redundancy).For following reason, in fact often there is operation mistake in this solution:
1) for hearing conservation level, industry provides guidance often through technical documentation, but this information can not directly obtain rapidly for operator, therefore usually out in the cold;
2) in scanning process in order to exchange with operator, the necessary wear headphones of patient, usual earphone has hearing conservation function in a way, but it is very limited, but in practical operation, earphone is often misapplied as hearing conservation by hospital, in this case, cannot ensure completely to reach hearing conservation standard;
3) in order to adopt safe solution, multiple special earplug must be adopted, simultaneously in view of communication needs, also earphone (earmuff) must be adopted, so in scanning process, earphone (earmuff) adds earplug becomes final solution, but patient feels very uncomfortable, and even refusal uses earplug.
Therefore, under new sequence type and parameter, prior art cannot ensure that the worst case of acoustic noise can not occur, so magnetic resonance imaging system industry needs the method solving and take effective science digital method to protect audition in scanning process badly.
Summary of the invention
Specific embodiments of the invention propose a kind of hearing protection auxiliary device of magnetic resonance imaging system, comprise a noise detection unit and a noise monitoring unit, wherein, described noise detection unit, for acquisition noise signal, is quantified as noise level data by described noise signal and exports described noise level data to described noise monitoring unit; Described noise monitoring unit, for the result based on the measure of described noise level data determination hearing conservation.
Preferably, described noise monitoring unit comprises a decision mechanism, and wherein, described decision mechanism, for comparing described noise level data with one or more threshold value thus determining described result.
Preferably; describedly described noise level data are compared with one or more threshold value thus determines that described result comprises; described noise level data are compared with a first threshold: if described noise level data are less than described first threshold; so described result is defined as without the need to taking hearing conservation measure, otherwise determines that described result takes hearing conservation measure for needs.
Preferably; describedly determine that described result takes hearing conservation measure to comprise for needs; described noise level data are compared with a Second Threshold: if described noise level data are less than described Second Threshold; so determine that described result is for taking the first hearing conservation measure, otherwise determine that described result is for taking other hearing conservation measures.
Preferably, described noise monitoring unit also comprises a storing mechanism, and wherein, described storing mechanism, for storing described threshold value.
Preferably, described hearing protection auxiliary device also comprises a notification unit, and described noise monitoring unit exports described hearing conservation measure to described notification unit, hearing conservation measure described in the operator that described notification unit notifies described magnetic resonance imaging system.
Preferably, described notification unit is a display or a sound-producing device.
Preferably, described noise detection unit is a sound transducer.
Specific embodiments of the invention also propose a kind of magnetic resonance imaging system, comprise as above arbitrary described hearing protection auxiliary device.
Specific embodiments of the invention also propose a kind of hearing protection householder method of magnetic resonance imaging system, comprise the following steps: acquisition noise signal, described noise signal is quantified as noise level data; Based on the result of described noise level data determination hearing conservation measure.
Preferably, the hearing protection householder method of described magnetic resonance imaging system also comprises: result described in the operator notifying described magnetic resonance imaging system.
Preferably, describedly to comprise based on the measure of described noise level data determination hearing conservation, described noise level data are compared with one or more threshold value thus determines described result.
Preferably; describedly described noise level data are compared with one or more threshold value thus determines that the result of hearing conservation measure comprises; described noise level data are compared with a first threshold: if described noise level data are less than described first threshold; so described result is defined as without the need to taking hearing conservation measure, otherwise determines that described result takes hearing conservation measure for needs.
Preferably; describedly determine that described result takes hearing conservation measure to comprise for needs; described noise level data are compared with a Second Threshold: if described noise level data are less than described Second Threshold; so determine that described result is for taking the first hearing conservation measure, otherwise determine that described result is for taking other hearing conservation measures.
Provide the judgment mechanism of noise risk control accurately and effectively according to the hearing protection auxiliary device of the specific embodiment of the present invention, this mechanism is based on quantized result and provide information in real time; The more important thing is, avoid the artificial judgement of operator according to the hearing protection auxiliary device of the specific embodiment of the present invention; Meanwhile, by effectively can reduce the noise reduction cost of magnetic resonance imaging system according to the hearing protection auxiliary device of the specific embodiment of the present invention.
Accompanying drawing explanation
The preferred embodiments of the present invention will be described in detail by referring to accompanying drawing below, the person of ordinary skill in the art is more clear that above-mentioned and other feature and advantage of the present invention, in accompanying drawing:
Fig. 1 is the module map of the hearing protection auxiliary device according to the specific embodiment of the present invention.
Fig. 2 is the workflow diagram of the decision mechanism of the noise monitoring unit of hearing protection auxiliary device according to the specific embodiment of the present invention.
Detailed description of the invention
In order to solve the problem proposed in background technology, the present invention proposes a kind of hearing protection auxiliary device of magnetic resonance imaging system.This hearing protection auxiliary device gathers the noise that magnetic resonance imaging system produces in scanning process and quantizes, and determines that user needs the hearing conservation of which kind of level based on the noise level through quantizing.
Fig. 1 is the module map of the hearing protection auxiliary device according to the specific embodiment of the present invention.As shown in Figure 1, noise detection unit 101 and noise monitoring unit 102 is comprised according to the hearing protection auxiliary device 100 of the specific embodiment of the present invention.As shown in Figure 1, noise detection unit 101 is for gathering the noise signal of importing patient's auditory system into and gathered noise signal being quantified as noise level data, the head that noise detection unit 101 is generally arranged on patient is neighbouring (such as, head coil or head fixing device or ear side), the noise that such noise detection unit 101 detects is exactly the noise importing patient's ear into.Further, noise signal is quantified as noise level data by noise detection unit 101, the noise level data such as in units of decibel.Specifically, noise detection unit 101 is sound transducers, this sound transducer gathers gathered noise signal, sample, date processing, analog/digital conversion thus obtain noise level data, and exports these noise level data to noise monitoring unit 102.
Further; based on these noise level data; noise monitoring unit 102 will determine whether the result taking hearing conservation measure; after determining to need to take hearing conservation measure; noise monitoring unit 102 will determine the result taking which kind of hearing conservation measure, and then this result exports by noise monitoring unit 102.Specifically, noise monitoring unit 102 comprises decision mechanism 1021.Noise level data and first threshold compare by decision mechanism 1021, thus draw the conclusion whether taking hearing conservation measure, and such as: if noise level data are more than or equal to first threshold, so decision mechanism is determined to take hearing conservation measure.Further; when determining to take hearing conservation measure; noise level data and Second Threshold compare by decision mechanism; thus draw the conclusion taking which kind of hearing conservation measure; such as: if noise level data are more than or equal to Second Threshold, so decision mechanism 1021 is determined to take corresponding hearing conservation measure.In addition, if there is multiple threshold value, and there is different hearing conservation measures corresponding to different threshold value, so noise level data compare with above-mentioned multiple threshold value by decision mechanism 1021 respectively, determine the hearing conservation measure corresponding to noise level.Specifically; the result of described hearing conservation measure comprises: do not take hearing protection, warning against danger, wear earplug and/or earmuff, pause sequence scanning etc., and above-mentioned various hearing conservation measure can according to different noise data levels separately or be combined.
Preferably, noise monitoring unit also comprises storing mechanism 1022, and storing mechanism 1022 stores first threshold, Second Threshold etc.
Fig. 2 is the workflow diagram of the decision mechanism of the noise monitoring unit of hearing protection auxiliary device according to the specific embodiment of the present invention.As shown in Figure 2, in step sl, decision mechanism judges whether (Y or N) is less than 99 decibels to noise level data (decibel), if noise level data are less than 99 decibels, so the first result R1 of the decision mechanism determination hearing protection measure of noise monitoring unit is without the need to taking hearing protection measure, if noise level data equal greatly 99 decibels, so enter step S2; In step s 2, decision mechanism judges whether (Y or N) is less than 113 decibels to noise level data (decibel), if noise level data are less than 113 decibels, so the second result R2 of the decision mechanism determination hearing protection measure of noise monitoring unit, namely the first hearing protection measure (earplug) is taked, if noise level data equal greatly 113 decibels, so enter step S3; Decision mechanism judges whether (Y or N) is less than 128 decibels to noise level data (decibel); if noise level data are less than 128 decibels; so the 3rd result R3 of the decision mechanism determination hearing protection measure of noise monitoring unit; namely the second hearing protection measure (earmuff) is taked; if noise level data equal greatly 128 decibels; so the 4th result R4 of the decision mechanism determination hearing protection measure of noise monitoring unit; namely the 3rd hearing protection measure (such as, earplug and earmuff use simultaneously) is taked.
As mentioned above; noise level data and each threshold value compare according to order from small to large by decision mechanism; in addition, noise level data and each threshold value can also compare according to order from big to small by decision mechanism, thus draw the result of different hearing protection measures.Described decision mechanism can be accomplished in several ways, and comprises software, hardware and logic programmable element (PLD, FPGA, ASIC) etc.
Further, notification unit 103 is also comprised according to the hearing protection auxiliary device 100 of the specific embodiment of the present invention.Described notification unit 103 utilizes the multiple means such as vision and/or audition to notify the monitored results of operator's noise monitoring unit 102.Preferably, notification unit 103 is integrated in the display of magnetic resonance imaging system, or notification unit 103 is integrated in the sound-producing device of magnetic resonance imaging system.
Provide the judgment mechanism of noise risk control accurately and effectively according to the hearing protection auxiliary device of the specific embodiment of the present invention, this mechanism is based on quantized result and provide information in real time; The more important thing is, avoid the artificial judgement of operator according to the hearing protection auxiliary device of the specific embodiment of the present invention; Meanwhile, by effectively can reduce the noise reduction cost of magnetic resonance imaging system according to the hearing protection auxiliary device of the specific embodiment of the present invention.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (14)
1. a hearing protection auxiliary device, comprises a noise detection unit and a noise monitoring unit, wherein,
Described noise detection unit, for gather specific region noise signal, described noise signal is quantified as noise level data and exports described noise level data to described noise monitoring unit;
Described noise monitoring unit, for the result based on the measure of described noise level data determination hearing conservation.
2. hearing protection auxiliary device as claimed in claim 1, it is characterized in that, described noise monitoring unit comprises a decision mechanism, and wherein, described decision mechanism, for comparing described noise level data with one or more threshold value thus determining described result.
3. hearing protection auxiliary device as claimed in claim 2; it is characterized in that; describedly described noise level data are compared with one or more threshold value thus determines that described result comprises; described noise level data are compared with a first threshold: if described noise level data are less than described first threshold; so described result is defined as without the need to taking hearing conservation measure, otherwise determines that described result takes hearing conservation measure for needs.
4. hearing protection auxiliary device as claimed in claim 3; it is characterized in that; describedly determine that described result takes hearing conservation measure to comprise for needs; described noise level data are compared with a Second Threshold: if described noise level data are less than described Second Threshold; so determine that described result is for taking the first hearing conservation measure, otherwise determine that described result is for taking other hearing conservation measures.
5. hearing protection auxiliary device as claimed in claim 2, it is characterized in that, described noise monitoring unit also comprises a storing mechanism, and wherein, described storing mechanism, for storing described threshold value.
6. hearing protection auxiliary device as claimed in claim 1; it is characterized in that; also comprise a notification unit, described noise monitoring unit exports described result to described notification unit, result described in the operator that described notification unit notifies described magnetic resonance imaging system.
7. hearing protection auxiliary device as claimed in claim 6, it is characterized in that, described notification unit is a display or a sound-producing device.
8. hearing protection auxiliary device as claimed in claim 1, it is characterized in that, described noise detection unit is a sound transducer.
9. a magnetic resonance imaging system, comprise as arbitrary in claim 1-8 as described in hearing protection auxiliary device.
10. a hearing protection householder method for magnetic resonance imaging system, comprises the following steps:
Gather the noise signal of specific region, described noise signal is quantified as noise level data;
Based on the result of described noise level data determination hearing conservation measure.
11. hearing protection householder methods as claimed in claim 10, is characterized in that, also comprise: result described in the operator notifying described magnetic resonance imaging system.
12. hearing protection householder methods as claimed in claim 10, is characterized in that, describedly comprise based on the measure of described noise level data determination hearing conservation, described noise level data are compared with one or more threshold value thus determine described result.
13. hearing protection householder methods as claimed in claim 12; it is characterized in that; describedly described noise level data are compared with one or more threshold value thus determines that the result of hearing conservation measure comprises; described noise level data are compared with a first threshold: if described noise level data are less than described first threshold; so described result is defined as without the need to taking hearing conservation measure, otherwise determines that described result takes hearing conservation measure for needs.
14. hearing protection householder methods as claimed in claim 13; it is characterized in that; describedly determine that described result takes hearing conservation measure to comprise for needs; described noise level data are compared with a Second Threshold: if described noise level data are less than described Second Threshold; so determine that described result is for taking the first hearing conservation measure, otherwise determine that described result is for taking other hearing conservation measures.
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| CN106647346A (en) * | 2016-09-26 | 2017-05-10 | 郑州云海信息技术有限公司 | Electronic noise reduction system control method and device |
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| CN109310524A (en) * | 2016-06-23 | 2019-02-05 | 3M创新有限公司 | Hearing protector with the position for actively avoiding sound danger and sound monitoring sensor |
| CN111295166A (en) * | 2017-11-07 | 2020-06-16 | 3M创新有限公司 | Replaceable acoustic device detection |
| US11023818B2 (en) | 2016-06-23 | 2021-06-01 | 3M Innovative Properties Company | Personal protective equipment system having analytics engine with integrated monitoring, alerting, and predictive safety event avoidance |
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| CN114026448A (en) * | 2020-04-06 | 2022-02-08 | 皇家飞利浦有限公司 | Magnetic resonance imaging system with acoustic warning signal |
| US11925232B2 (en) | 2016-06-23 | 2024-03-12 | 3M Innovative Properties Company | Hearing protector with positional and sound monitoring sensors for proactive sound hazard avoidance |
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| CN105411588B (en) * | 2015-10-29 | 2018-05-04 | 上海联影医疗科技有限公司 | The safety monitoring device and method of MRI machine |
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| CN109310524A (en) * | 2016-06-23 | 2019-02-05 | 3M创新有限公司 | Hearing protector with the position for actively avoiding sound danger and sound monitoring sensor |
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| CN114026448A (en) * | 2020-04-06 | 2022-02-08 | 皇家飞利浦有限公司 | Magnetic resonance imaging system with acoustic warning signal |
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