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Triggering in quantitative diffusion imaging with single-shot EPI.

S Brockstedt1, M Borg, B Geijer

  • 1Department of Radiation Physics, University Hospital, Lund, Sweden.

Acta Radiologica (Stockholm, Sweden : 1987)
|May 21, 1999
PubMed
Summary
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Electrocardiographic (ECG) triggering improves accuracy in diffusion MRI measurements. While not essential for routine clinical use, it enhances quantitative data precision by reducing motion artifacts.

Area of Science:

  • Neuroimaging
  • Diffusion MRI

Background:

  • Physiological motion, including brain motion and cerebrospinal fluid (CSF) pulsations, can impact diffusion Magnetic Resonance Imaging (MRI) measurements.
  • Echo-planar imaging (EPI) is susceptible to motion artifacts, affecting the accuracy of diffusion quantification.

Purpose of the Study:

  • To evaluate the effects of physiological motion on diffusion MRI using electrocardiographic (ECG) triggered and non-triggered single-shot EPI.
  • To compare the accuracy and reproducibility of diffusion measurements under different ECG triggering protocols.

Main Methods:

  • Six healthy volunteers underwent diffusion-weighted (DW) EPI scans.
  • Three triggering protocols were tested: ECG triggering with a 100 ms time delay (TD), ECG triggering with a 400 ms TD, and no triggering.
  • Apparent diffusion coefficient (ADC) values and their reproducibility were analyzed.

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Main Results:

  • Mean white matter ADC values were comparable across all triggering protocols.
  • Reproducibility of ADC measurements in DW-EPI was generally good.
  • Higher standard deviation in ADC values was observed in non-triggered scans compared to triggered scans.

Conclusions:

  • Prospective diastolic ECG triggering significantly enhances the accuracy of quantitative diffusion MRI measurements.
  • For routine clinical diffusion imaging where precise quantitative data is less critical, non-triggered EPI may provide adequate accuracy.