Improving radiofrequency power and specific absorption rate management with bumped transmit elements in ultra‐high field MRI

Abstract

In this study, we investigated a simple design strategy based on adding bumps to a resonant element to reduce the local SAR while maintaining <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msubsup><mml:mi>B</mml:mi><mml:mn>1</mml:mn><mml:mo>+</mml:mo></mml:msubsup></mml:math> inside an ROI. As an example, we modified an FD and performed EM simulations and phantom experiments with a 10.5T scanner. Results show that the peak 10g-averaged SAR can be reduced more than 25%.