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Updated: May 26, 2026

Cardiac Magnetic Resonance Imaging at 7 Tesla

Cardiac Magnetic Resonance Imaging at 7 Tesla

Published on: January 6, 2019

Interventional loopless antenna at 7 T.

Mehmet Arcan Ertürk¹, Abdel-Monem M El-Sharkawy, Paul A Bottomley

¹Russell H. Morgan Department of Radiology and Radiological Science, Johns Hopkins University, Baltimore, Maryland, United States of America.

Magnetic Resonance in Medicine

|December 14, 2011

Summary

This summary is machine-generated.

This study introduces a novel loopless antenna for magnetic resonance imaging (MRI) detectors, achieving significant signal-to-noise ratio gains at 7 Tesla. This advancement enables higher resolution imaging for interventional procedures.

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Area of Science:

Medical Imaging
Biophysics
Electrical Engineering

Background:

Interventional magnetic resonance imaging (MRI) requires specialized detectors for high-resolution imaging.
Loopless antennas offer potential for miniaturization and improved signal-to-noise ratio (SNR) in MRI.

Purpose of the Study:

To investigate the SNR performance and radiofrequency (RF) safety of a loopless antenna MRI detector at 7 Tesla (T).
To compare the performance of the 7 T loopless antenna with equivalent 3 T devices.
To assess the feasibility of using the loopless antenna for high-resolution interventional MRI.

Main Methods:

Theoretical investigation using the electromagnetic method-of-moments.
Experimental validation in a standard 7 T human MRI scanner.
Performance comparison with 3 T MRI devices and assessment of RF safety parameters (SAR, temperature increase).

Main Results:

An absolute SNR gain of 5.7 ± 1.5-fold was achieved at 7 T compared to 3 T, exceeding 20-fold at 1.5 T.
The effective field-of-view area increased approximately 10-fold at 7 T versus 3 T.
Safe operation was confirmed with specific absorption rates (SAR) <12 W kg⁻¹ and temperature increases <1.9°C at 7 T.

Conclusions:

The loopless antenna demonstrates significant SNR and field-of-view improvements at 7 T MRI.
This technology enables magnetic resonance imaging microscopy at 40-50 micrometer resolution.
The findings suggest potential for high-resolution, large-field-of-view, or endoscopic MRI in targeted interventional applications.