Dual Channel Noise Canceling
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) |
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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
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