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Related Experiment Videos

Quiet imaging with interleaved spiral read-out.

C Oesterle1, F Hennel, J Hennig

  • 1Department of Radiology, Section of Medical Physics, University Hospital, Freiburg, Germany. oesterle@ukl.uni-freiburg.de

Magnetic Resonance Imaging
|January 24, 2002
PubMed
Summary

Soft gradient pulses in MRI reduce acoustic noise but increase scan times. Interleaved spiral trajectories with long gradient slopes offer a solution, reducing acquisition time while maintaining low noise levels, as shown in phantom and volunteer studies.

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Area of Science:

  • Medical Imaging
  • Acoustic Engineering
  • Biomedical Engineering

Background:

  • Magnetic Resonance Imaging (MRI) sequences generate significant acoustic noise.
  • Soft gradient pulses with sinusoidal ramps can reduce this noise.
  • However, the long slope duration of these pulses increases MRI acquisition times.

Purpose of the Study:

  • To investigate interleaved spiral trajectories with long gradient slopes to reduce MRI acquisition time.
  • To maintain low acoustic noise levels while shortening scan duration.
  • To assess the practical feasibility of this method in MRI.

Main Methods:

  • Implementation of interleaved spiral MRI trajectories.
  • Calculation of trajectories using long gradient slopes.

Related Experiment Videos

  • Acoustic noise level measurements during MRI sequences.
  • Image quality assessment on phantoms and human volunteers.

    • Main Results:

    • The proposed interleaved spiral trajectories effectively reduce MRI acquisition time.
    • Low acoustic noise levels are maintained comparable to standard soft pulse methods.
    • Demonstrated practicality and feasibility on phantom and volunteer datasets.

    Conclusions:

    • Interleaved spiral trajectories with long gradient slopes provide an effective strategy for reducing MRI acoustic noise and acquisition time simultaneously.
    • This approach offers a promising method for improving patient comfort and throughput in MRI examinations.
    • The technique is validated through practical application on phantom and volunteer imaging.