Pneumatic Audio Transducer for MRI Noise Reduction
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Solution Overview
Problem
Traditional headphones used in MRI environments fail to effectively reduce noise for patients while allowing communication with healthcare professionals without interfering with the magnetic field or causing image artifacts, and they are often bulky and not suited for head imaging.
Innovation Solution
A pneumatic audio system comprising a sound-insulating audio transducer with a piezoelectric speaker, a hollow tube for audio signal transmission, and a compact headphone design that isolates external noise, allows quick disconnect, and uses MRI-invisible tubing to prevent artifacts in imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional headphones with speakers in earcups are used, then hearing protection is provided and communication is enabled, but the earcups are bulky and may interfere with MRI imaging of the head
Solution Approach 1:
The patent extracts the speaker from the traditional earcup structure and positions it within the head coil assembly. The speaker is mounted on the inner surface of the head coil, allowing audio delivery without requiring bulky external earcups that would interfere with MRI imaging. This extraction enables hearing protection and communication functionality while maintaining compatibility with head imaging procedures.
Solution Approach 2:
The patent merges the audio delivery system with the head coil assembly by integrating the speaker mounting structure into the coil framework. The head coil serves dual purposes: both MRI imaging and audio delivery. This merging eliminates the need for separate bulky headphones and ensures the audio system does not interfere with the imaging process.
2Loss of information
If traditional headphones with speakers are used, then communication with the patient is enabled, but the components may interfere with the magnetic field or cause artifacts in the image
Solution Approach 1:
The patent introduces a non-magnetic mounting structure as an intermediary between the speaker and the head coil. This intermediary structure, made from non-magnetic materials, allows the speaker to be positioned within the head coil assembly without introducing magnetic field interference or artifacts. The mounting structure mediates between the audio delivery requirement and the magnetic field compatibility requirement.
3Power
If the speaker is positioned to deliver sound effectively, then audio transmission is improved, but vibrations from the MRI scanner may affect the speaker performance
Solution Approach 1:
The patent incorporates vibration isolation elements in the speaker mounting structure before the vibrations can affect the speaker. These cushioning elements, positioned between the speaker and the head coil framework, absorb and dampen vibrations from the MRI scanner before they reach the speaker. This beforehand cushioning protects the speaker from vibration-induced performance degradation while maintaining effective audio transmission.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively reduces noise for patients, enables clear communication with healthcare professionals, minimizes vibrations, and prevents artifacts in MRI images by using sound-insulating and MRI-compatible components.
Implementation Method 1
a hollow tube coupled to the audio transducer at a first end and configured to transmit audio signals from the speaker through the tube
Implementation Method 2
a sound insulating insert supported within the housing... that minimizes the vibrations of an MRI scanner by insulating the speaker from sounds outside the housing of the transducer
Implementation Method 3
a speaker supported by the sound insulating insert... The speaker may be a piezoelectric speaker
Data Source
AI summary
A pneumatic audio system which is compatible with use within an MRI environment is disclosed. The system has an audio transducer including a housing having a plurality of walls, a foam insert supported within the housing, and a speaker supported by the foam insert and extending at an angle with respect to the walls of the housing. The system further has a hollow tube coupled to the audio transducer at a first end and configured to transmit audio signals from the speaker through the tube. The system further has an earphone coupled to a second end of the hollow tube and configured to deliver audio signals to an ear canal of a human user.