Keywords: Gradients, Gradients
Motivation: The gradient system can be the most expensive part of a low field MRI system with minimal construction costs. Current solutions have linear amplifiers which may not reach power requirements, requiring pricey off-the-shelf amplifiers.
Goal(s): Reduce the cost of the gradient drivers by taking amplifier efficiency into consideration to enable better low field MRI system creations.
Approach: Uses an amplifier topology more commonly used at higher power, an H-bridge, but a high switching frequency reduces filtering requirements. A modular design eases construction.
Results: The amplifier we created attains an increased efficiency, a smaller size, and a lower cost to attain useful power.
Impact: Gradient drivers can dominate the overall cost of low-field MRI scanners. Our amplifier costs under 80USD and is capable of a 120V 15A DC output with a bandwidth of 150kHz. It contributes to cost reduction of gradient drivers significantly.
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