Table 2.
MDCT-based perfusion parameters
| Parameter | NS | SNI | SCE |
| PBF(mL/100 mL/min) | |||
| Mean ± SD | 221.5 ± 55.6 | 226.0 ± 47.5 | 210.3 ± 83.7 |
| Range (low–high) | 132.9–323.6 | 152.0–307.2 | 140.1–420.2 |
| CV | 0.43 ± 0.07 | 0.45 ± 0.11 | 0.58 ± 0.12 |
| MTT (seconds) | |||
| Mean ± SD | 4.68 ± 1.01 | 4.54 ± 0.70 | 4.08 ± 0.88 |
| Range (low–high) | 3.34–6.36 | 3.21–5.47 | 2.02–5.21 |
| CV | 0.45 ± 0.09 | 0.44 ± 0.08 | 0.58 ± 0.10 |
Results are expressed as mean ± SD unless noted. MTT, mean transit time; NS, persons who had never smoked; PBF, pulmonary blood flow; SCE, smokers with emphysema present on MDCT; SNI, smokers with normal MDCT imaging studies.