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The human ear cannot distinguish between two sources of sound if they happen to reach within a specific time interval, typically 0.1 seconds apart. More than this, and they are perceived as separate sources.
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The importance of understanding acceleration spans our day-to-day experiences, as well as the vast reaches of outer space and the tiny world of subatomic physics. In everyday conversation, to accelerate means to speed up. For instance, we are familiar with the acceleration of our car; the harder we apply our foot to the gas pedal, the faster we accelerate. The greater the acceleration, the greater the change in velocity over a given time. Acceleration is widely seen in experimental physics. In...
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Author Spotlight: Optimized Lung MRI Protocol with Computationally Efficient Reconstruction Methods
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Accelerating multi-slice spatiotemporally encoded MRI with simultaneous echo refocusing.

Yao Luo1, Jun Zhang1, Lin Chen1

  • 1Department of Electronic Science, Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance, Xiamen University, Xiamen 361005, China.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|September 10, 2018
PubMed
Summary
This summary is machine-generated.

A new multi-echo segmented SPEN (ME-SeSPEN) MRI method enhances imaging speed and robustness. This ultrafast technique reduces sampling time and eddy current effects, improving multi-slice MRI applications.

Keywords:
Multi-slice MRISegmented slice selectionSimultaneous multi-slicesSpatiotemporal encoding

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Medical Imaging Technology
  • Biophysics

Background:

  • Ultrafast MRI, particularly single-shot spatiotemporally encoded (SPEN) MRI, offers advantages in robustness against magnetic field inhomogeneity and chemical-shift displacement.
  • Multi-slice SPEN MRI is an emerging technique for accelerated multi-slice imaging.

Purpose of the Study:

  • To introduce a novel multi-slice SPEN MRI method named multi-echo segmented SPEN (ME-SeSPEN).
  • To evaluate the efficiency and robustness of ME-SeSPEN compared to existing MRI techniques.

Main Methods:

  • Development of the ME-SeSPEN method for simultaneous multi-slice acquisition within a single echo train.
  • Image reconstruction using a de-convolution super-resolved algorithm.
  • Validation through phantom, lemon, and in vivo experiments, comparing with spin-echo EPI, SER, and SeSPEN MRI.

Main Results:

  • ME-SeSPEN achieved a practical 20% reduction in sampling time compared to SeSPEN when acquiring two slices simultaneously.
  • The method demonstrated reduced eddy current effects.
  • ME-SeSPEN maintained SPEN MRI's benefits, including robustness to field inhomogeneity, spatial resolution, and signal-to-noise ratio, comparable to SeSPEN.

Conclusions:

  • ME-SeSPEN is an efficient and robust multi-slice ultrafast MRI technique.
  • The method enhances the versatility of multi-slice MRI for practical applications.
  • ME-SeSPEN offers a promising advancement in accelerated MRI acquisition.