New Enhanced-Fidelity Linear Gradient Amplifier
AE Techron's new 7794MRL provides a solution for the unique requirements of low-cost, high-performance ultra-low-field MRI
By: AE Techron Inc
Conventional MRI gradient amplifiers have a switching frequency of 80 kHz to 125 kHz, which coincides with the operational frequencies of some ultra-low-field systems and makes them unusable for ULF MRI applications. To fulfill the requirements for ULF operation, the 7794MRL was developed using a linear Class AB amplifier topology, which has no switching noise at any frequency. In addition, an auto-ranging power supply was used to improve amplifier efficiency and increase long-term power. The results are a gradient amplifier with a 100V/200A potential even under very high-duty cycle pulse sequences, with a signal-to-noise ratio exceeding -110 dBA, and a total noise output under 0.2 mA.
As an industry pioneer in MRI, AE Techron engineers developed some of the first commercially available gradient amplifiers, and AE Techron 2100 series gradient amplifiers currently power many short-bore MRI and NMR systems. The 7794MRL incorporates over three decades of AE Techron's engineering knowledge and experience designing linear gradient amplifiers for use in MRI/NMR systems. Input from leaders in the ULF MRI community helped to ensure the unique requirements of high-fidelity, small footprint and modest cost would be met.
AE Techron President Larry Shank explains the likely impact: "The 7794MRL is a gradient amplifier that can be used successfully in MRI systems with field strengths as low as an amazing 6 mT. We believe the 7794MRL will help to further the mission of ultra-low-field MRI researchers and manufacturers:
AE Techron, Inc. (aetechron.com)
AE Techron, Inc.