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Universal Hand-held Three-dimensional Optoacoustic Imaging Probe for Deep Tissue Human Angiography and Functional Preclinical Studies in Real Time
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ZTE imaging in humans.

Markus Weiger1, David O Brunner, Benjamin E Dietrich

  • 1Institute for Biomedical Engineering, University and ETH Zurich, Zurich, Switzerland. weiger@biomed.ee.ethz.ch

Magnetic Resonance in Medicine
|June 19, 2013
PubMed
Summary
This summary is machine-generated.

Zero echo time (ZTE) imaging enables silent, direct MRI of tissues with rapid relaxation. This study demonstrates human ZTE imaging on a whole-body magnet, achieving high resolution and significantly reduced noise levels.

Keywords:
3D radialRF powerT/R switchingfast T2 relaxationshort TRsilent MRI

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Radiology

Background:

  • Zero echo time (ZTE) imaging is a 3D radial MRI technique.
  • It excels in imaging tissues with very rapid transverse relaxation.
  • Previous successes were limited to micro- and animal MRI systems.

Purpose of the Study:

  • To enable and demonstrate Zero echo time (ZTE) imaging in humans.
  • To utilize a whole-body magnetic resonance imaging (MRI) magnet for human ZTE scans.
  • To showcase the potential for silent and direct MRI of specific tissues.

Main Methods:

  • A 7 Tesla (T) MRI scanner was enhanced with rapid transmit-receive switches and a custom spectrometer.
  • A proton-free detector coil was employed.
  • The system achieved an effective dead time of only 5 microseconds (µs).

Main Results:

  • Human ZTE imaging was successfully performed on volunteers, visualizing head and joints.
  • High isotropic resolution down to 0.83 mm was achieved.
  • A sound pressure level of 41 dB(A) was recorded, over 40 dB(A) lower than conventional MRI.

Conclusions:

  • Zero echo time (ZTE) imaging was demonstrated in humans for the first time.
  • This was made possible by specialized, high-performance radiofrequency (RF) hardware.
  • The technique offers a silent alternative for high-resolution human MRI.