(ISMRM 2024) <b>FARADAY PASSIVE SHIELDING & EFFECTIVENESS TESTING, EMI DETECTION & CANCELLATION USING A SINGLE RF COIL IN 48mT, 2 MHz POINT-OF-CARE LOW FIELD MRI.</b>
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Abstract #1434

FARADAY PASSIVE SHIELDING & EFFECTIVENESS TESTING, EMI DETECTION & CANCELLATION USING A SINGLE RF COIL IN 48mT, 2 MHz POINT-OF-CARE LOW FIELD MRI.

Ronald Amodoi1
1BIOMEDICAL ENGINEERING, MRI-UGANDA, MBARARA UNIVERSITY OF SCIENCE AND TECHNOLOGY, Mbarara, Uganda

Synopsis

Keywords: Signal Representations, Signal Representations

Motivation: Point-of-Care Low Field MRI scanners are predominantly stifled by generic time-varying EMI, engendered by adjoined scanner electronics, environmental interference & radiation close to the lamor frequency and extraneous , creating decreased signal-to-noise ratio and artifacts on images.

Goal(s): Passive Faraday Shielding & Effectiveness Testing, EMI Detection, Cancellation using a single RF coil.

Approach: Passive Faraday Shielding using Aluminium and Copper sheets, Shielding Effectiveness testing using calibrated transmitters and receivers, EMI detection & cancellation using a single RF coil.

Results: Faraday Passive Shielding done and upto 74dB EMI attenuation effective. Active EMI detection & cancellation showed EMI reduction up to approximately 53% in signal strength and 46% image quality.

Impact: Broadband and Structured EMI elimination using passive faraday shielding with additional suppression techniques like system grounding, detection and elimination using a single coil will significantly improve signal strength by curbing signal loss and consequently better image quality.

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Keywords