Table 1. Size distributions of ^99mTc-PTCs, ^99mTc-PPTCs, and ^99mTc-BPTCs.

Isotope colloid	PVP amount (mg)	Particle size (nm) by time
		30 min	90 min	3 hr	6 hr
99mTc-PTC	10	8.4 ± 6.41	4.0 ± 0.36	5.1 ± 1.65	15.3 ± 2.50
	20	9.43 ± 3.26	4.5 ± 0.40	5.6 ± 2.03	13.7 ± 4.57
	30	20.2 ± 1.76	5.7 ± 1.17	5.6 ± 1.97	10.9 ± 2.65
	40	23.4 ± 0.85	6.4 ± 1.72	7.2 ± 2.97	7.6 ± 0.61
	50	18.7 ± 4.27	9.6 ± 1.67	8.2 ± 1.25	10.1 ± 1.43
99mTc-PPTC	10	48.4 ± 5.12	46.8 ± 15.7	57.3 ± 6.53	64.4 ± 5.87
	20	16.5 ± 12.19	55.8 ± 5.31	50.6 ± 13.24	54.7 ± 2.66
	30	55.3 ± 37.59	139.0 ± 139.2	81.9 ± 41.6	75.4 ± 42
	40	25.0 ± 6.92	31.5 ± 6.24	46.37 ± 3.46	44.2 ± 4.41
	50	25.1 ± 8.02	30.6 ± 7.82	48.5 ± 0.36	102.5 ± 107.3
99mTc-BPTC	10	513.7 ± 107.82	551.3 ± 287.17	1,369.4 ± 1,121.62	1,404 ± 1,109
	20	9.27 ± 0.75	1,157.3 ± 1,344.9	968.58 ± 608.07	1,195 ± 672.6
	30	8.97 ± 0.49	184.38 ± 231.56	1,141 ± 1,256.02	643.9 ± 685.61
	40	8.37 ± 1.25	17.8 ± 4.86	11.3 ± 2.12	10.2 ± 1.15
	50	7.6 ± 0.69	16.5 ± 6.76	12.7 ± 1.11	12.6 ± 1.04

Values are expressed as mean±SD (n=3).