Exponential T2 Fitting with Even Echoes Only or Skipping the First Echo: How Well Does it Work?
Kelly C McPhee 1 and Alan H Wilman 2
Physics, University of Alberta, Edmonton,
Engineering, University of Alberta, Edmonton, Alberta,
It is common for researchers to skip the first echo, or
skip all odd echoes in the echo train in order to
determine T2 from exponential fitting multi-echo spin
echo data. Using both simulations and in vivo
experiments of slice selective muti-echo spin echo
experiments, we find that these alternate exponential
fitting schemes do not avoid T2-misestimation. Skipping
the first echo may reduce errors to less than 10%, if
very wide refocusing pulses are used, provided that the
refocusing angles are >150 degrees.
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