Table 2.

Mean (CV) penetration index (PI) and deposition of radioactivity in the lungs, trachea/oesophagus, and oral cavity immediately after nebulization and subsequent mouth rinsing

			Deposition of radioactivity
Radioaerosol	Nebulizer	PI	Lungs (MBq 99mTc)	Trachea/oesophagus (MBq 99mTc)	Oral cavity(MBq 99mTc)	Trachea/oesophagus andoral cavity (% of total)
99mTc-DTPA	Pari	1.8 (24%)	7.5 (14%)	0.4 (52%)	0.4 (59%)	10
99mTc-DTPA	UltraVent	2.4 (11%)	5.5 (26%)	0.1 (38%)	< 0.1 n.a.	< 4
99mTc-Nanocoll	Pari	1.7 (21%)	12.9 (34%)	0.5 (87%)	0.7 (77%)	9

n.a. = not applicable.