Table 2.

CT volumes and emphysema index values in patients with emphysema.

	CT Volume (L)				Emphysema Index (%)
Patient#	Scanner	TLC(1)	RV(1)	RV/TLC(%)	TLC(2)	RV(2)	TLC(3)	RV(3)
P1	1	7.81	6.67	85.38	57	53	76	70
P2	1	5.69	4.58	80.51	53	49	70	63
P3	1	8.00	7.12	88.93	55	54	71	69
P4	2	5.46	4.74	86.87	38	32	61	52
P5	2	4.88	3.88	79.56	33	24	53	42
P6	1	7.39	6.39	86.42	44	40	54	43
P7	2	4.73	3.51	74.07	19	12	37	18
P8	1	7.56	5.73	75.76	47	42	60	46
P9	1	7.33	5.29	72.15	47	40	63	44
P10	2	5.73	4.50	78.46	39	30	55	43
P11	2	5.87	3.73	63.64	40	27	60	39
P12	2	4.75	3.72	78.39	37	30	58	47
P13	1	8.85	7.34	82.94	49	44	64	55
P14	1	5.26	5.14	97.66	42	41	45	50
P15	1	7.13	4.77	66.88	44	37	57	34
P16	1	7.89	6.47	82.01	46	42	59	48
P17	2	8.94	6.95	77.79	37	27	61	45
P18	2	5.44	3.56	65.48	34	19	59	31
Mean		6.60	5.23	79.05	42	36	59	47
SD		1.42	1.32	8.68	9	11	9	13
SE		0.33	0.30	1.99	2	3	2	3

⁽¹⁾Calculated with from images reconstructed with B50f (thickness=1 mm);

⁽²⁾Calculated with threshold at −950 HU (images reconstructed with B50f and thickness=1 mm);

⁽³⁾Calculated with threshold at −910 HU (images reconstructed with B30f and thickness=5 or 10 mm).

CT scanner: 1=Siemens; 2=GE