P16071: MRI-Compatible EEG Cap
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Build & Test Prep

Table of Contents

Team Vision and Plan for Next Phases

Build & Test Prep Documents Directory

Team shared vision for week 5 review:

During the week 5 review, the team plans to demonstrate a single-modulator system with a known input signal to highlight signal resolution and recovery. Ideally, the team would like to show the use of one modulator and two standard electrodes to obtain alpha EEG waves as an early proof-of-concept. At this point, the PCB design will be completed and sent for assembly and materials testing for MRI-compatibility and safety will be completed.

Team shared vision for week 8 review:

During the week 8 review, the team plans to, at minimum, demonstrate the functionality of the depackaged, bias-free modulator in its new casing, as well as the back-end components such as the amplifier and microprocessor. Ideally, the team will also show preliminary efforts to obtain alpha waves with a 3-modulator system, but this will be highly dependent on the PCB assembly and integration timeline.

Team shared vision for week 11 review:

During the week 11 review, the team plans to show an early demonstration of the system to be shown at ImagineRIT. The system will consist of the cap, repositionable electrodes, fiberoptic wires, backend box and a monitor to show collected alpha waves. The team also plans to share preliminary test data on the system’s function both inside and outside of the MRI environment.

Team shared vision for ImagineRIT:

During ImagineRIT, the team plans to demonstrate functionality of the optical system in achieving, at minimum, alpha wave EEG signals. The team also plans to show data collected that demonstrates the system’s compatibility in an MRI environment. The team should be able to quickly set up the prototype on an audience volunteer and acquire alpha waves.

Team shared vision for final review:

During the final review, the team plans to have a functional, portable, and repositionable 8-channel electroencephalogram (EEG), with extensive documentation to support its MRI compatibility as well as its function outside of an MRI environment and comparable performance to existing EEG equipment.

The MSD II Schedule can be viewed here.

Project Summary

System Architecture

System Architecture

Testing Results

Ferminonics Photodiode

The lab document can be viewed here.

Purpose:

To determine whether or not an inexpensive, Fermionics FC/PC-connected photodiode could obtain comparable SNR values to the Thorlabs photodiode in the optics lab.

Procedure:

The minimum resolvable voltage for the Thorlabs photodiode was determined previously. This photodiode was then replaced by the Fermionics photodiode, which was tested using the same protocol. Several signal amplitudes were tested nearly the resolution limit of the photodiode to determine the approximate voltage at which the system would satisfy the Rose criterion for signal-to-noise ratio.

Results:

A minimum resolvable voltage of 12.5 uV was obtained. See graph below.
Fermionics FD80 Photodiode

Fermionics FD80 Photodiode

Conclusion:

The Fermionics photodiode exhibited superior performance over the lab’s photodiode and validated its use in our final system design.
Conclusion

Conclusion

Prototype Amplifier

The lab document can be viewed here.

Purpose:

To compare the performance of the prototype amplifier with that of the Femto low-noise amplifier used in the optics lab.

Procedure:

The system performance with the Femto amplifier was previously characterized, and the minimum resolvable voltage was found to be approximately 12.5 uV (SNR = 5.5). This amplifier was then replaced with the prototype amplifier, and its minimum resolvable voltage was characterized.

Results:

While the system was not characterized extensively, the amplifier was capable of resolving a 15 uV signal with an SNR of 6.7.

Conclusion:

The performance of the prototype amplifier was nearly comparable to that of the existing one. Further improvements are expected when the amplifier is instead placed on the PCB and in a shielded box.
Conclusion

Conclusion

Engineering Requirements

The Engineering Requirements can be found here.

Test Plan Summary

The Test Plan can be viewed here.

The Detailed Test Plan can be viewed here.

Bill of Materials (BOM)

The Bill of Materials for the SM System can be viewed here.

The Bill of Materials for the PM System can be viewed here.

Risk and Problem Tracking

The Risk Assessment can be viewed here.

The Problem Tracker can be viewed here.

Plans for next phase

The MSD II Schedule can be viewed here.

The Team Self-Critique can be viewed here.

The 3 - Week Individual Accountability Projections can be found here.

The 5 - Phase Individual Accountability Projections can be found here.


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