Multimodality imaging with CT, MR and FDG-PET for radiotherapy target volume delineation in oropharyngeal squamous cell carcinoma

Table 2 Summary of volume of GTVs contoured using CT, MR, CT-MR and PET

Modality	Modality Volumes (cm³)
	Mean	Median	Mean St. Dev.	Range		Mean GTV Volume (Statistically Significant p-values)
	Mean	Median	Mean St. Dev.	Max	Min	Mean GTV Volume (Statistically Significant p-values)
CT	11.9	11.6	4.5	34.5	1.6	CT < CT-MR, p = 0.005
CT-MR	14.1	14.0	3.7	40.2	2.2	CT < MR, p = 0.049
MR	12.7	12.8	2.5	34.4	2.2	MR < CT-MR, p = 0.33
PET	9.5	8.8	-	24.6	1.5	PET < CT, p = 0.059
PET	9.5	8.8	-	24.6	1.5	PET < CT-MR, ρ <0.001PET < MR, ρ = 0.003

ISSN: 1471-2407