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Human brain imaging at 9.4 T using a tunable patch antenna for transmission.

Jens Hoffmann¹, G Shajan, Juliane Budde

¹Max Planck Institute for Biological Cybernetics, High-Field Magnetic Resonance Center, Tübingen 72076, Germany.

Magnetic Resonance in Medicine

|June 19, 2012

Summary

This study introduces a novel patch antenna for ultrahigh field human brain imaging at 9.4 Tesla, improving B1+ field uniformity and coverage in narrow bores. The new system enhances imaging quality while maintaining patient comfort.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Biomedical Engineering
Radiofrequency Coil Design

Background:

Traveling wave concepts offer uniform B1+ fields for ultrahigh field MRI but have limitations in transmit efficiency and applicability in narrow radiofrequency shields.
Conventional volume coils and microstrip arrays face challenges in achieving optimal performance in confined spaces for human brain imaging.

Purpose of the Study:

To develop and evaluate a novel radiofrequency coil system combining a capacitively adjustable patch antenna with a receive-only array for 9.4 T human brain imaging.
To overcome the limitations of traveling wave concepts and conventional arrays in narrow bore systems.

Main Methods:

A compact, capacitively adjustable patch antenna was designed for excitation, integrated with a receive-only array for 9.4 T MRI.
The system was experimentally and numerically compared to conventional microstrip arrays.
High-resolution functional and anatomical brain images were acquired in vivo.

Main Results:

The patch antenna system demonstrated improved B1+ field homogeneity and longitudinal coverage compared to conventional microstrip arrays.
Enhanced transmit efficiency was achieved due to the antenna's compact size and proximity to the subject.
Elevated local specific absorption rate (SAR) was observed as a trade-off.

Conclusions:

The developed patch antenna and receive-only array system is effective for in vivo human brain imaging at 9.4 T.
This approach offers improved B1+ field uniformity and coverage in narrow bore systems, enhancing imaging quality.
Further optimization is needed to manage specific absorption rate (SAR) while leveraging the benefits of this novel coil design.