What type of study is this?

This is a Experimental Study study.

September 17, 2025

Highly-Efficient Switched-Mode Radio Frequency Power Amplifier for Magnetic Resonance

Puntos clave

The prototype demonstrates an 85% efficiency while generating 150W chirped RF pulses, significantly enhancing performance.
With a 2 MHz bandwidth centered around 64 MHz, the amplifier maintains a similar amplitude spectrum to traditional systems.
Developed using a broadband switched-mode topology, this design eliminates the need for bulky cooling systems typically needed in RF amplifiers.
The improvements could lead to more sustainable magnetic resonance systems by reducing both costs and the size of hardware.

Resumen

Motivation: Existing RF amplifiers for MR are predominantly implemented using linear topologies, which suffer from poor efficiency and require bulky cooling systems. Goal(s): Our goal is to significantly reduce the energy consumption, cost and size of RF systems used in MR by developing a highly efficient and compact RF amplifier with only passive cooling. Approach: We develop a broadband switched-mode amplifier capable of generating chirped RF pulses with the same amplitude spectrum as conventional sinc pulses. Results: A compact prototype is demonstrated with a 2 MHz bandwidth centered around 64 MHz. Experimental measurements show an efficiency of 85% when generating 150W chirped RF pulses. Impact: The proposed technology significantly improves the efficiency of RF power amplifiers, contributing to more sustainable MR systems. It also provides advantages by reducing both the cost and size of hardware, potentially increasing the accessibility and portability of MR systems.

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