Noisy MR Scan: No Noise Reduction
 Noisy MR Scan: No Noise Reduction
Noisy MR Scan: Dual Channel Noise Reduction
 Noisy MR Scan: Dual Channel Noise Reduction
High Pitch EPI Scan: No Noise Reduction
 High Pitch EPI Scan: No Noise Reduction
High Pitch EPI Scan: Dual Channel Noise Reduction
 High Pitch EPI Scan: Dual Channel Noise Reduction

Note that you may wish to lower the volume of your speakers before sampling these sounds.

Above are 'before and after' audio samples and waveforms from typical MRI environments that use Optoacoustics' patented fiber optic microphone technology.
 

How Optoacoustics' Adaptive Noise Reduction Works

EPI sequences used in MR imaging can produce acoustic noise levels as great as 130 dB (about as loud as a jet plane at takeoff), as well as very high electromagnetic and radio frequency noise. These noises are not just discomforting to patient and staff alike, they render standard microphones useless for communications.
Our advanced noise cancelling optical communications products enable safe, crystal-clear verbal communications among MRI staff, as well as between doctors and MRI patients.

We achieve this using two complementary techniques:

  • Using pressure gradient optical microphones with inherent low self noise, wide bandwidth, a high dynamic range and a high directivity index.
  • Using two separate phase and amplitude matched microphones, arranged orthogonally, to capture input sound at the precisely the same location. 

No other system available today offers the level of performance, reliability and ease of use that is provided by our IMROC™ and FOMRI™ systems.