Reverse-phase interference filtering active wave protection equipment for PET-MR working noise

Abstract

The invention discloses inverse interference filtering active wave protection equipment for PET-MR working noise. The equipment comprises a headphone earmuff (1), branch air pipes (3), a main air pipe(4) and a processing unit (5), one end of the first branch air pipe (13), one end of the second branch air pipe (14) and one end of the third branch air pipe (15) are connected with a first sound wave receiver (10), a second sound wave receiver (11) and a sound wave releaser (12) in the headphone earmuff (1) respectively. The other ends are respectively connected with a first piezoelectric sensor(51), a second piezoelectric sensor (57) and a sound wave generator (56) in the processing unit (5); active and passive modes are combined to cooperate with synchronous dual-mode work to effectivelyreduce noise, the active noise reduction work mode uses the same frequency and the same amplitude to perform opposite phase interference offset noise reduction and peak clipping noise reduction, the manufacturing is simple, the cost is low, the use and maintenance are safe and convenient, and the influence on PET collection is effectively reduced.

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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