Anti-phase interference filtering active wave protection equipment for pet-mr working noise

Abstract

Anti-phase interference filter active wave protection equipment for PET-MR working noise, including headset earmuffs (1), distribution tube (3), main tube (4) and processing unit (5); the first bronchus ( 13), one end of the second bronchus (14) and the third bronchus (15) are respectively connected to the first sound wave receiver (10), the second sound wave receiver (11) and the sound wave receiver (11) in the headphone earmuffs (1). The release device (12), the other end is respectively connected to the first piezoelectric sensor (51), the second piezoelectric sensor (57) and the sound wave generator (56) in the processing unit (5); combine active and passive two ways to cooperate Synchronous dual-mode operation effectively reduces noise. The active noise reduction mode uses the same frequency and the same amplitude to perform opposite phase interference to cancel noise reduction, peak clipping and noise reduction. It is simple to manufacture, low in cost, safe and convenient to use and maintain, and effectively reduces the impact on PET. collection impact.

Description

technical field [0001] The present invention relates to IPC classification A61B5 / 055 including Electromagnetic Resonance [EMR] or Nuclear Magnetic Resonance [NMR], such as Magnetic Resonance Imaging or G01R33 / 20 Magnetic Resonance Imaging Scanning Detection Equipment's structural improvement technology for auxiliary noise protection devices, belonging to Nuclear Magnetic Resonance Safety In the field of protection, especially the anti-phase interference filter active wave protection equipment for PET-MR working noise. Background technique [0002] PET-MRI is a new technology that combines the molecular imaging function of positron emission tomography (PET) with the excellent soft tissue contrast function of magnetic resonance imaging (MRI). PET-MRI can image diseased cells that have spread in soft tissue. It enables patients to be scanned in various modalities, and the system can also collect PET and MR images separately. Compared with other methods, PET / MRI examination ha...

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Problems solved by technology

(3) A3243G mitochondrial DNA mutation in cell A3243G after noise stimulation, abnormal cell metabolism, and dysfunction of inner and outer hair cells, resulting in hearing loss

[0016] 1) The volume is large, and it needs to be clamped on the head when used, which is too bulky;

[0017] 2) Because it is a physical sound insulation method, the clamping force of the earphones between the ears is too large, causing users to feel uncomfortable when wearing them, and cause a stuffy feeling;

[0018] 3) The sound insulation effect cannot achieve a good effect, and there is still a lot of noise leaking into the ear

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