Biomedical Engineering Reference
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FIGURE 8.2: Respiratory pattern of some patients. The amplitude and the
cycle length as well as shape varies significantly with time and among different
patients.
increases. This leads to an apparent change in the uptake estimated on the
PET images due to the partial volume effect.
The motion of heart due to cardiac motion is estimated at 25 mm [63] in
some cases. It must be noted that in opposition to the respiratory signal, the
amplitude of the ECG signal from the heart does not correspond to the actual
physical motion of the heart. The ECG gives information about the phase of
the heart cycle only.
8.2 Motion correction on 3D PET data
The basic idea for motion correction in emission tomography is to correct
the data for motion by first estimating the motion and then compensating
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