Figure 5.

Coronal views of a cardiac ammonia PET/CT study from patient A. The PET images (row 2) were attenuation corrected with the corresponding attenuation images from row 1. The original CT scan provided reasonable attenuation correction, as deemed by visual inspection and is labeled correct (a). We shifted the attenuation image to force a mismatch (column b). The alignment process successfully aligned the attenuation image (column c) with the emission data. Note that in column (b) the PET myocardium appears in the CT lung space and chest wall, leading to artifacts throughout the lateral wall in the PET image.