Table 1.

GTV volumes for each patient

	% of prostatic volume
Patient	GTV-Histo	GTV-PET	GTV-MRI	GTV-union	Volume prostate (ml)
1	17%	39%	8%	41%	31.9
2	10%	23%	8%	24%	31.4
3	32%	25%	25%	36%	61.8
4	25%	9%	19%	22%	53.6
5	2%	2%	1%	2%	110.2
6	3%	4%	3%	5%	48.7
7	2%	3%	1%	4%	70
8	4%	10%	4%	11%	60
9	19%	24%	22%	33%	26.5
10	33%	26%	10%	26%	47.6
Mean	15%	17%	10%	20%	54.2
SD ±	12%	13%	9%	14%	24.4

GTV-histo was not significantly smaller than GTV-union (p = 0.1) and GTV-PET (p = 0.715) but significant larger than GTV-MRI (p = 0.047) in Wilcoxon matched pairs signed-rank test. Mean prostatic volume (delineated in CT) was 54.2 ± 24.4 ml