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Single-shot pseudo-centric EPI for magnetization-prepared imaging.

Hyun-Soo Lee1,2, Seon-Ha Hwang1, Jaeseok Park3,4

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A new single-shot centric-reordered EPI (1sh-CenEPI) technique significantly reduces echo time (TE) and improves signal-to-noise ratio (SNR) for magnetization-prepared imaging. This method offers comparable image quality to conventional EPI while enhancing temporal and spatial SNR in perfusion imaging.

Keywords:
centric reorderingecho planar imagingmagnetization-prepared imagingpCASLphase encoding order

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Physics
  • Radiology

Background:

  • Magnetization-prepared imaging techniques are crucial for various MRI applications.
  • Conventional echo-planar imaging (EPI) often suffers from long echo times (TE), limiting signal-to-noise ratio (SNR) and susceptibility to artifacts.
  • Optimizing EPI readout strategies is essential for improving image quality and acquisition speed.

Purpose of the Study:

  • To implement and evaluate a novel single-shot centric-reordered EPI (1sh-CenEPI) sequence.
  • To assess the capability of 1sh-CenEPI in significantly reducing TE and enhancing SNR.
  • To explore the application of 1sh-CenEPI in magnetization-prepared imaging, including pseudo-continuous arterial spin labeling (pCASL).

Main Methods:

  • Developed a 1sh-CenEPI sequence incorporating grouped oscillating readout gradients and specific phase-encoding blips.
  • Acquired k-space data from the center outwards in a single shot.
  • Tested the sequence on phantoms and human brains at 3 Tesla and applied it to pCASL.

Main Results:

  • Reduced TE from 50 ms to 1.4 ms (GRE) and 100 ms to 7 ms (SE) with minimal readout duration increase.
  • 1sh-CenEPI images showed no significant geometric distortion, comparable to conventional EPI.
  • Achieved a 3-fold temporal and 2-fold spatial SNR increase in pCASL perfusion-weighted images compared to linear ordering.

Conclusions:

  • The proposed 1sh-CenEPI effectively reduces TE while maintaining readout window and image quality.
  • 1sh-CenEPI provides superior SNR performance in magnetization-prepared imaging, demonstrated by pCASL.
  • 1sh-CenEPI is a promising readout technique for various advanced MRI applications requiring improved SNR and speed.