Biomedical Engineering Reference
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FIGURE 5.17: Respiratory gating in cardiac PET using four gates. Emission
data is divided into subsets with reduced motion characteristics according to a
respiratory signal acquired during the scan. Shown here is an amplitude-based
gating approach. Respiratory motion is clearly resolved in the gated images.
attenuation-corrected image data. The whole process is known as respiratory-
gated emission tomography [57] (Figure 5.17). Respiratory gating was shown
to be of advantage in terms of uptake quantification in both oncology [70]
[60] and cardiac [57] PET scans. Examples demonstrating the gain in tracer
quantification and spatial resolution using respiratory-gating are shown in
Figure 5.18 for cardiac PET and Figure 5.19 for a PET scan of lung tumors.
FIGURE 5.18: Cardiac FDG PET/CT scan. The respiratory-gated images
demonstrate superior spatial resolution and minimized image artifacts, albeit
at the cost of image statistics resulting in higher noise levels.
 
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