Table 3.

Estimates of Pulmonary Regional Deposition in Each Lung

Subject	Study	Lung	2D normalized C/P ratio	3D normalized C/P ratio	Bronchial airways deposition fraction	Bronchiolar airways deposition fraction	Weibel conducting airways deposition fraction	24-h clearance
1	A	R	2.02	2.97	0.24	0.17	0.51	0.65
		L		3.96	0.35	0.19	0.72	0.64
	B	R	0.94	1.07	0.02	0.09	0.35	0.37
		L		0.83	0.02	0.10	0.36	0.37
2	A	R	1.11	1.91	0.12	0.09	0.44	0.47
		L		2.65	0.18	0.10	0.49	0.49
	B	R	0.87	0.81	0.01	0.06	0.24	0.32
		L		0.92	0.03	0.06	0.26	0.31
3	A	R	1.21	1.94	0.19	0.21	0.73	0.47
		L		2.33	0.19	0.21	0.72	0.50
	B	R	1.07	1.14	0.03	0.07	0.26	0.27
		L		1.36	0.03	0.06	0.26	0.28
4	A	R	1.14	1.55	0.08	0.14	0.59	0.43
		L		2.20	0.13	0.14	0.63	0.44
	B	R	0.85	0.68	0.01	0.07	0.29	0.27
		L		0.96	0.02	0.07	0.30	0.29
5	A	R	1.11	1.51	0.04	0.08	0.33	0.45
		L		1.96	0.12	0.16	0.56	0.47
	B	R	1.08	1.29	0.03	0.06	0.26	0.35
		L		1.57	0.07	0.07	0.30	0.38

The 2D normalized central-to-peripheral ratio was only calculated for the right lung due to the problem of overlay of the stomach on the region representing the left lung.