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Related Experiment Videos

A computer simulation of T2 decay effects in echo planar imaging.

K Oshio1, M Singh

  • 1Department of Radiology, University of Southern California, Los Angeles 90089-1451.

Magnetic Resonance in Medicine
|September 1, 1989
PubMed
Summary

This study investigates spatially variant T2 decay in echo planar images. A new method removes T2 effects without needing T2 values by using the geometric mean before Fourier transformation.

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Area of Science:

  • Medical imaging
  • Magnetic resonance imaging (MRI)

Background:

  • Echo planar imaging (EPI) is susceptible to signal loss due to T2 decay.
  • Spatially variant T2 decay introduces artifacts and distorts image data.
  • Accurate T2 value estimation is often complex and time-consuming.

Purpose of the Study:

  • To investigate the impact of spatially variant T2 decay on echo planar images.
  • To develop and report a simple, direct method for removing T2 effects in EPI.
  • To demonstrate a technique that does not require prior knowledge of T2 values.

Main Methods:

  • The study analyzed the effects of T2 decay in echo planar imaging.
  • A novel method was developed utilizing the geometric mean of two Hermitian symmetric data points.
  • This process is performed prior to Fourier transformation for image reconstruction.

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Main Results:

  • The proposed method effectively removes T2 decay effects from echo planar images.
  • The technique does not necessitate knowledge of the specific T2 values present in the sample.
  • The geometric mean approach provides a direct and efficient solution.

Conclusions:

  • Spatially variant T2 decay significantly impacts echo planar image quality.
  • The developed geometric mean method offers a practical solution for T2 effect correction in EPI.
  • This technique enhances the reliability and accuracy of MRI data without complex parameter estimation.