Design Considerations Towards Size-Adaptive pTx Arrays for 7T Brain Imaging

Motivation: Enhancing MRI imaging at 7T requires overcoming B1+ field homogeneity challenges. Multichannel transmit arrays aim to address these issues for improved imaging quality. Goal(s): Develop a size-adaptive 16-channel transceiver for precise head size customization at 7T, optimizing imaging quality and safety while maintaining SAR efficiency. Approach: Utilize 3D-CAD design, simulation, and bench testing to evaluate the performance of the adaptive coil's segmented structure and adjustable components. Results: The proposed 16-channel adaptive coil shows superior transmission efficiency and stable SAR performance, highlighting its potential for enhancing MRI imaging at 7T. Impact: The novel 16-channel size-adaptive transceiver array for 7T enhances transmission efficiency with maintaining consistent SAR performance. Its four-segment design, featuring three adjustable segments (two lateral and one anterior), ensures precise head size customization with superior parallel imaging and safety.