Table 4.

Individual increases in lung tissue volumes following injection of contrast material in the two groups of patients

Patient no	Apparent increase in lung tissue (ml)	Maximum artifactual increase in lung tissue (ml)	Minimum actual increase in lung tissue (ml)
Group 1 (30 s after injection)
1	27	0	27
2	31	21	10
3	38	2	36
4	74	43	31
5	139	70	69
6	96	14	82
7	173	146	27
Mean ± SD	83 ± 57	42 ± 52	40 ± 26
Group 2 (15 min after injection)
8	24	37	0
9	32	26	6
10	77	57	19
11	108	9	99
12	107	11	96
13	100	26	74
14	266	48	218
Mean ± SD	102 ± 80	31 ± 18	73 ± 76