The dual channel FOMRI system is
our leading edge noise canceling system for MRI environments.
It combines two complementary Optoacoustics technologies into a single microphone
housing: orthogonal and matched pressure gradient noise canceling. In addition,
it uses a powerful adaptive algorithm that is uniquely designed for two channel
applications. Supports tight integration with existing MRI communication systems.
Optoacoustics’ dual channel
FOMRI provides noise canceling at on-axis (0, 180) and off-axis (90,
270) geometries using two complementary techniques.
Single Channel Features
High-end microphone ideal for voice key applications
Combines two complimentary noise canceling technologies
Eliminated EPI acoustic noise
Real-Time Adaptive noise canceling capability
Complete EMI/RFI immunity means no effect on MR imaging
Stand alone or integrated with existing MRI communications systems
Supports both headset and flexible boom mounting configurations for maximum
patient comfort
Flexible signal outputs to medical hardware through separate audio unit,
recorder or PC
Enables optical fiber lengths from 20 to 100 meters without signal
loss
Includes OptiMRI PC-based software for advanced real-time speech
enhancement, recording capabilities and noise filtering in post-process
mode
Accessories
Fitted disposable hygienic screens to remove pop noise and enable exact
FOMRI distance and orientation to patients mouth (100 pack)
Zip coated fiber optical extension cord at any length
Specifications
Frequency Response
50-4,000 Hz
Directional Index
4.8 dB
Maximum Acoustic Pressure
130 dB SPL
Total Harmonic Distortion
< 1% at 94 dB SPL
Microphone Output Type
Digital USB
Audio Format
16 bit WAV
Latency - Software
96 msec
Latency - DSP (optional)
10 msec
Supply Voltage
9-12VDC
Power Consumption
2.5W
Current Drain
80 mA +/- 10%
Operating Temperature
50 to 122° F (10 - 50° C)
Storage Temperature
32 to 140° F (0 - 60° C)
Humidity - 1000 hours
Up to 95% RH at 104° F
MTFB
>100,000 hours
Microphone Material
Delrin
Base Mount Dimensions
2.36"/2.36"/1" (60/60/25 mm)
Weight
2.1 oz (160 g)
Gooseneck Boom Length
11.8" (300 mm)
Optical Cable Length
32' (10 m)
FOMRI™ II
Basic Noise Canceling Optical Microphone
On axis and Off axis Noise Cancellation
Applications
Interactive patient communications
Interactive patient communications during fMRI scan procedures
Speech Studies in fMRI
Communications in auditory fMRI
Physician and radiologist communications in interventional
MRI environments
