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T2 relaxometry measurements in low spatial frequency brain regions differ between fast spin-echo and multiple-echo

Venkateswaran Rajagopalan1, Mark J Lowe, Erik B Beall

  • 1Department of Biomedical Engineering, ND2, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA, venkatrp78@yahoo.co.in.

Magma (New York, N.Y.)
|January 29, 2013
PubMed
Summary
This summary is machine-generated.

Fast spin-echo (FSE) sequences may introduce significant errors in T2 relaxometry for neurological studies. Multi-echo spin-echo (MESE) sequences provide more accurate T2 values, especially in critical brain regions like the corticospinal tract.

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Radiology

Background:

  • Dual-echo fast spin-echo (FSE) sequences are commonly used in T2 relaxometry for neurological disorders due to their speed and simplicity.
  • However, FSE sequences may introduce spatial frequency-dependent errors in T2 value estimations.
  • These errors can vary based on the specific brain region's spatial frequency characteristics.

Purpose of the Study:

  • To evaluate the accuracy of T2 relaxometry using dual-echo FSE sequences compared to multi-echo spin-echo (MESE) sequences.
  • To quantify potential errors in T2 values derived from FSE sequences, particularly in specific white matter tracts and gray matter.
  • To assess the impact of spatial frequency on T2 measurement accuracy.

Main Methods:

  • Acquisition of dual-echo FSE and MESE sequences in nine subjects.
  • Estimation of T2 decay curves and generation of percent error maps for both sequence types.
  • Analysis of T2 error values along the corticospinal tract (CST) and in whole-brain white matter (WM) and gray matter (GM).
  • Paired t test to compare T2 values between FSE and MESE sequences in the CST.

Main Results:

  • Histograms revealed systematic errors in T2 values derived from FSE sequences across CST, WM, and GM.
  • Significant differences (P < 0.001) in T2 values were observed in the CST when comparing FSE and MESE sequences.
  • Error analysis indicated that FSE sequences are prone to inaccuracies even in low spatial frequency regions.

Conclusions:

  • T2 values obtained using FSE sequences are susceptible to substantial errors when compared to MESE sequences.
  • These inaccuracies persist even in low spatial frequency regions like the corticospinal tract.
  • Researchers should consider the limitations of FSE sequences in T2 relaxometry for neurological studies.