More focal increased uptake in the distal esophagus is sometimes seen with Barrett's esophagus.
This effect was more pronounced for focal uptake than for organs.
The selection criterion was a visually definable increase of uptake, with more focal metastases preferable.
For PET scans, suspicious lesions were defined as any focal uptake, at one or more locations, higher than the nearby background or compared with normal tissue, excluding joint processes and areas of physiological uptake.
A positive PET-CT was defined as a radiologist interpretation of abnormal increased uptake (diffuse and/or one or more focal skeletal areas) and/or evidence of lytic bone destruction on the CT portion of the exam.
A simplified multicenter calibration procedure for PET/CT scans that show highly focal uptake and negligible background is feasible and results in more precise quantification.
Due to the confusing surgical anatomy, recurrent tumours are more easily identified with PET/CT than with CT alone due to the increased focal uptake of recurrent disease.
Focal uptake of FDG in the thyroid gland represents malignancy in 30% or more of cases[ 29 34].
These images also show an initial heterogenous and focal uptake of radioactivity at 2 days p.i. (Figure 2) which progressively becomes more diffuse over the 7 day period (see Figures S3 and S4).
Symptomatic ossicles can show increased focal uptake (Chew 2010).
