Table 2.

Image interpretation. Definitions of subjective assessment of image quality (a) and PET alignment used for image interpretation (b)

a Images Quality
1	Poor quality, not diagnostically acceptable for interpretation
2	Suboptimal quality, worse than routine images with excessive image noise
3	Acceptable quality, diagnostic interpretation possible but noise more than routine images
4	Good quality, noise similar to routine images
5	Excellent quality, no image noise

b Quality of positron emission tomography (PET)/CT alignment
1	Poor alignment, complete lack of alignment
2	Suboptimal alignment, differs by more than 25 mm
3	Acceptable alignment, differs >5 but <25 mm
4	Good alignment, differs <5 mm
5	Excellent alignment, no misalignment