Biomedical Engineering Reference
In-Depth Information
FIGURE 8.2
Significant painful heat activation clusters (
0.01) with no motion correction (top
row), standard motion correction (middle row), and motion correction with spin history
correction (bottom row). (Original data courtesy of R. Wise and I. Tracey.)
Z
2.3,
P
which have increased in size after basic motion correction and then decreased
after motion correction with spin history correction. Figure 8.3 shows the clear
correlation between the stimulation-derived model (regular peaks corre-
sponding to time points when pain was applied) and the time series of esti-
mated values for rotation about the
axis (thus mainly corresponding to
“nodding” head movements). Given this correlation, it is to be expected that
the bottom row would show less activation than the middle row, as explained
above.
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