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Magnetic Resonance Imaging

Magnetic Resonance Imaging

Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...

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Shielded microstrip array for 7T human MR imaging.

Bing Wu¹, Chunsheng Wang, Douglas A C Kelley

¹Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA 94158, USA.

IEEE Transactions on Medical Imaging

|October 14, 2009

Summary

This summary is machine-generated.

Radio-frequency (RF) shielding improves microstrip transceiver arrays for ultrahigh field magnetic resonance imaging (MRI). This technique enhances signal reception and excitation by reducing cable resonance and improving image quality.

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Area of Science:

Magnetic Resonance Imaging (MRI)
Radio-Frequency (RF) Engineering
Coil Design

Background:

Microstrip transmission line designs are crucial for ultrahigh field MRI signal excitation and reception.
Increasing RF channels in microstrip transceiver arrays leads to insufficient ground planes, causing cable resonance, reduced Q-factors, and degraded imaging quality.

Purpose of the Study:

To present an effective method for enhancing the performance of microstrip transceiver arrays.
To mitigate issues associated with insufficient grounding in high-channel-count RF arrays.

Main Methods:

Introduction of RF shielding around the microstrip array and coaxial feeding cables.
Quantitative measurement and evaluation of RF coil resonance stability using an experimental method.

Main Results:

RF shielding significantly reduced electromagnetic interactions between cables.
Improved resonance stability and increased Q-factors were observed.
Enhanced imaging quality was achieved due to the mitigation of cable resonance.

Conclusions:

RF shielding is a viable strategy to overcome performance limitations in microstrip transceiver arrays for ultrahigh field MRI.
The proposed method offers a practical solution for improving RF coil stability and overall MRI performance.