Table 3.

SUV Data for FDG PET. The average and range in FDG SUV levels for PET scans performed approximately 3 months (PET1) and 12 months (PET2). SUV levels were determined at the 5 levels shown in fig. 1. The number of patients displaying a change in SUV of greater than 12% (26,27) likely representing a significant change are shown in the right hand columns for either increasing or decreasing SUV levels between PET1 and PET2. These data show changes in FDG uptake in irradiated tissues between 3 and 12 months post-treatment are common

	PET 1		PET 2		SUV change*
	Average	Range	Average	Range	increase†	decrease†
Top of tongue	3.0	1.4–4.7	2.8	1.6–3.5	4	7
Mid tongue base	3.1	2.3–4.7	3.0	1.7–5.9	3	8
Vallecula	2.8	1.4–5.0	3.0	1.8–5.7	7	5
Supraglottic larynx	2.8	1.9–5.1	2.7	1.6–4.2	4	5
Glottic larynx	3.4	2.2–5.4	3.4	1.8–6.6	5	9

^*Changes in SUV, either increasing or decreasing, were defined as greater than 12%.

^†Number of patients with noted change (increase or decrease) between the 2 PET scans.