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A time encoding method for single-shot imaging

M E Meyerand1, E C Wong

  • 1Biophysics Research Institute, Medical College of Wisconsin, Milwaukee 53226, USA.

Magnetic Resonance in Medicine
|October 1, 1995
PubMed
Summary
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A novel 2D single-shot imaging method encodes the second dimension in time, not phase. This technique offers aliasing-free and motion-insensitive imaging for enhanced 2D imaging applications.

Area of Science:

  • Medical Imaging
  • Physics

Background:

  • Traditional 2D imaging often relies on phase encoding, which can be susceptible to aliasing and motion artifacts.
  • Single-shot techniques aim to acquire all data for an image in one excitation, but often face limitations in speed or resolution.

Purpose of the Study:

  • To introduce a new 2D single-shot imaging technique that overcomes limitations of traditional methods.
  • To demonstrate a method for aliasing-free and motion-insensitive image acquisition.

Main Methods:

  • A novel 2D single-shot imaging approach utilizing one dimension of Fourier encoding.
  • The second spatial dimension is encoded in time via a closely spaced echo train, with each echo from a different object line.
  • Image reconstruction is performed using a 1D Fourier transform on each acquired echo.

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Main Results:

  • The technique achieves aliasing-free image reconstruction, even for objects larger than the field of view, due to selective line excitation.
  • The time encoding approach renders the method highly insensitive to motion artifacts, as they do not propagate in the time dimension.
  • Successful 2D image reconstruction from a single shot using time-encoded data.

Conclusions:

  • This new 2D single-shot imaging technique offers a robust alternative to conventional methods.
  • The aliasing-free and motion-insensitive properties make it suitable for challenging imaging scenarios.