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Related Experiment Videos

Modified gradients for motion suppression: variable echo time and variable bandwidth.

J L Duerk1, O P Simonetti, G C Hurst

  • 1Department of Radiology, MetroHealth Medical Center, Cleveland, Ohio 44109.

Magnetic Resonance Imaging
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Time scaling gradient waveforms in MRI exponentially increases motion sensitivity. This technique allows artifact reduction methods to work at variable echo times, improving imaging of moving tissues like in cardiac MRI.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Signal Processing
  • Medical Physics

Background:

  • Gradient waveforms in MRI are typically designed for specific echo times.
  • Motion artifacts are a significant challenge in MRI, especially for moving tissues.
  • Existing artifact reduction techniques often rely on specific refocussing moments.

Purpose of the Study:

  • To demonstrate how linear time scaling of gradient waveforms affects motion sensitivity.
  • To show that time scaling can adapt artifact reduction techniques for variable echo times.
  • To provide a method for predicting and modifying motion sensitivity in MRI.

Main Methods:

  • Linear algebra based analysis of gradient waveform time scaling.
  • Mathematical derivation of the relationship between time scaling factor (R) and motion sensitivity increase (R(i+1)).

Related Experiment Videos

  • Application of the technique to refocussing gradient waveforms and prediction of motion sensitivity changes.

    • Main Results:

    • Linearly time scaling a gradient waveform by R exponentially increases sensitivity to the i-th derivative of position by R(i+1).
    • Time scaling preserves zero refocussing moments, enabling artifact reduction at variable echo times.
    • Predicted changes in motion sensitivity were demonstrated in a clinical cardiac imaging example.

    Conclusions:

    • Time scaling offers a simple modification for gradient waveforms, allowing artifact reduction at variable echo times.
    • This technique facilitates prediction and modification of motion sensitivity for gradient waveforms.
    • The method has broad applicability in MRI of moving tissues, including cardiac imaging.