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Transmitting Plant Viruses Using Whiteflies
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A 32-channel parallel transmit system add-on for 7T MRI
Stephan Orzada1, Klaus Solbach2, Marcel Gratz1,3
1Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
Plos One
|September 13, 2019
Summary
A new 32-channel parallel transmit (pTx) system enhances 7 Tesla whole-body imaging. This advanced technology shows promising results for phantom and in-vivo scans, improving imaging capabilities.
Area of Science:
- Magnetic Resonance Imaging (MRI)
- Radiofrequency Engineering
Background:
- Ultra-high field (UHF) MRI, particularly at 7 Tesla (7T), offers enhanced signal-to-noise ratio and spectral resolution.
- Implementing parallel transmit (pTx) technology at 7T is crucial for improving radiofrequency (RF) field homogeneity and enabling advanced imaging techniques for whole-body applications.
Purpose of the Study:
- To present a novel 32-channel parallel transmit (pTx) add-on system designed for 7 Tesla (7T) whole-body MRI.
- To evaluate the performance and functionality of the 32-channel pTx system using phantom and in-vivo imaging.
Main Methods:
- Development of a 32-channel transmit/receive body array integrated into an add-on system with modulators, amplifiers, SAR supervision, and control hardware.
- Acquisition of B1+ field maps in phantoms and in-vivo scans of large volunteers.
- Electromagnetic (EM) simulations were performed to ensure system safety and operational integrity.
Main Results:
- Demonstrated good agreement between EM simulations and experimental measurements.
- Achieved whole-body imaging with a field of view up to 50 cm in the z-direction.
- Enabled selective RF excitation with a 100 kHz sampling rate without compromising the performance of the original single-channel system.
Conclusions:
- The developed 32-channel parallel transmit system demonstrates promising performance for ultra-high field (7T) whole-body MRI.
- The add-on system is a viable solution for enhancing UHF MRI capabilities, offering improved imaging potential.
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