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Related Experiment Video

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Simultaneous multislice readout-segmented echo planar imaging for accelerated diffusion tensor imaging of the

Andrei Manoliu1,2, Michael Ho1, Marco Piccirelli3

  • 1Institute for Diagnostic and Interventional Radiology, Department of Radiology, University Hospital Zurich, University of Zurich, Zurich, Switzerland.

Journal of Magnetic Resonance Imaging : JMRI
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Summary

Simultaneous multislice (SMS) diffusion tensor imaging (DTI) with readout-segmented echo planar imaging (rs-EPI) accelerates mandibular nerve scans. 2xSMS rs-EPI provides comparable image quality and is clinically feasible, offering a promising DTI method.

Keywords:
diffusion tensor imagingdiffusion tractographymandibular nervesimultaneous multislice echo-planar imaging

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Area of Science:

  • Medical Imaging
  • Neuroimaging

Background:

  • Diffusion tensor imaging (DTI) of mandibular nerves is challenging due to susceptibility artifacts with echo planar imaging (EPI).
  • Readout-segmented EPI (rs-EPI) reduces artifacts but increases scan time.

Purpose of the Study:

  • To evaluate the feasibility of simultaneous multislice (SMS) acquisition with blipped CAIPI for accelerated rs-EPI of mandibular nerves.
  • To assess the impact of SMS acceleration on DTI parameters and image quality.

Main Methods:

  • Eight volunteers underwent 3T MRI using conventional, 2xSMS, and 3xSMS accelerated rs-EPI sequences.
  • Tractography was performed, and signal-to-noise ratio (SNR), fractional anisotropy (FA), mean diffusivity (MD), and tract counts were analyzed.
  • Clinical feasibility of 2xSMS rs-EPI was tested in four patients.

Main Results:

  • SNR was similar for conventional and 2xSMS rs-EPI but lower for 3xSMS rs-EPI.
  • FA values were comparable across all sequences.
  • 3xSMS rs-EPI showed lower MD and fewer tracts; 2xSMS rs-EPI demonstrated clinical feasibility with robust results.

Conclusions:

  • 2xSMS rs-EPI achieves similar DTI metrics to conventional rs-EPI with reduced scan time.
  • This accelerated technique is feasible in clinical settings, suggesting its potential for mandibular nerve DTI.