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Our final prototype is a fully MRI-compatible pneumatic headphone system consisting of three optimized components:
Our final prototype is a fully MRI-compatible pneumatic headphone system consisting of three optimized components:
1. Headphones
Shell Material: resin, a durable, FDA-compatible material
Headband Material: Tough 1500 plastic for rigidity and durability
Noise Dampening: High-density acoustic foam lining and recycled denim insulation muffs
Comfort Features: Adjustable headband and snug earcup fit for effective acoustic sealing
2. Transducer
Function: Converts electrical audio signals to air pressure waves sent through tubing
Material: ABS with 15% infill for internal dampening and smoother sound transmission
Design Testing: Smooth domes performed better than stair-step domes in decibel output
3. Pneumatic Tubing
Material: Polyvinyl Chloride (PVC) tubing with 1.25 in outer diameter
Advantages: Rigid, kink-resistant, and provides superior sound clarity over long distances
All components were connected using silicone sealant to prevent sound leakage and maintain durable seals.
All components were connected using silicone sealant to prevent sound leakage and maintain durable seals.
Test Bed
Test Bed
Anechoic Chamber
Anechoic Chamber
Chamber lined with acoustic foam to absorb excess sound waves to eliminate sound reflection (echo)
Isolates the sound within chamber so external noise is prevented from affecting analysis
Ensures a controlled sound environment for precise acoustic analysis of what a patient would hear inside an MRI.
Inside the Chamber:
Inside the Chamber:
Speakers to recreate MRI sounds up to 130dB
Mannequin head to simulate a person hearing the headphones
Microphone inside the mannequin head to simulate what a person would be hearing and records for analysis
Overall, the chamber replicates the environment inside an MRI during the procedure.
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