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Echo-time reduction for submillimeter resolution imaging with a 3D phase encode time reduced acquisition method

K Ying1, P Schmalbrock, B Clymer

  • 1Department of Radiology and Electrical Engineering, Ohio State University, Columbus 43210.

Magnetic Resonance in Medicine
|January 1, 1995
PubMed
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This study introduces a novel 3D gradient echo imaging method for the inner ear, significantly reducing susceptibility artifacts. The technique achieves submillimeter resolution with a very short effective echo time (TE), enhancing image quality.

Area of Science:

  • Medical Imaging
  • Radiology
  • Neuroimaging

Background:

  • Optimal inner ear imaging requires minimizing susceptibility dephasing effects.
  • Short echo time (TE) is crucial for high spatial resolution, but limited by phase encode gradients at submillimeter voxel sizes.
  • Existing methods face limitations in achieving very short TE for high-resolution inner ear scans.

Purpose of the Study:

  • To develop and validate a 3D gradient echo pulse sequence for inner ear imaging with very short effective echo time (TE).
  • To improve image quality and spatial resolution by reducing susceptibility artifacts.
  • To enable submillimeter resolution imaging of the inner ear.

Main Methods:

  • Implemented a modified 3D gradient echo pulse sequence using short triangular phase encode gradients for central k-space and longer trapezoidal gradients for outer portions.

Related Experiment Videos

  • Applied the modified phase encoding scheme in both in-plane and slice directions.
  • Tested the sequence on phantoms and in vivo, comparing results with standard 3D imaging.

    • Main Results:

    • Achieved submillimeter resolution (0.35 x 0.35 x 0.7 mm3) with an effective TE of 3.2 ms.
    • Demonstrated significant reduction in susceptibility artifacts at air/fluid interfaces compared to standard 3D images (TE = 8 ms).
    • Effective TE was determined by the minimal TE used for central k-space sampling.

    Conclusions:

    • The novel phase encoding scheme effectively reduces echo time (TE) in 3D gradient echo imaging.
    • This method significantly enhances image quality and spatial resolution for inner ear imaging by mitigating susceptibility artifacts.
    • The technique holds promise for improved diagnostic capabilities in inner ear pathologies.