Objective: To evaluate the efficacy of dynamic multi-slice spiral computed tomography (MSCT) for providing quantitative information about blood flow patterns of solitary pulmonary nodules (SPNs). Methods: Seventy-eight patients with SPNs (diameter ≤ 4 cm; 68 malignant; 10 active inflammatory) were underwent multi-location dynamic contrast mate-rial-enhanced serial CT (nonionic contrast material was administrated via the antecubital vein at a rate of 4 mL/s by using an autoinjector, 4 × 5 mm or 4 × 2.5 mm transverse scanning mode with stable table were performed). Sixteen series CT scans (16 scans each for the first and second series and one scan each for the rest series) were obtained during 9 min scanning period. Precontrast and postcontrast attenuation on every scan was recorded. Perfusion, peak height and ratio of peak height of the SPN to that of the aorta were calculated. Perfusion was calculated from the maximum gradient of the time-attenuation curve and the peak height of the aorta. Results: No statistically significant difference in the peak height was found between malignant (35.79 ± 10.76 Hu) and active inflammatory (39.76 ± 4.59 Hu) (t = 1.148, P = 0.255 > 0.05). SPN-to-aorta ratio (14.27% ± 4.37) and perfusion value (30.18 mL/min/100 g ± 9.58) in malignant SPNs were significantly lower than those of active inflammatory (18.51% ± 2.71, 63.44 mL/min/100 g ± 43.87) (t = 2.978, P = 0.004 < 0.05; t = 5.590, P < 0.0001). Conclusion: The quantitative information about blood flow patterns of malignant and active inflammatory SPNs is different . SPN-to-aorta ratio and perfusion value are helpful in differentiating malignant nodules from active inflammatory. Objective: To evaluate the efficacy of dynamic multi-slice spiral computed tomography (MSCT) for providing quantitative information about blood flow patterns of solitary pulmonary nodules (SPNs). Methods: Seventy-eight patients with SPNs (diameter ≤ 4 cm; 68 malignant; 10 active inflammatory) were underwent multi-location dynamic contrast mate-rial-enhanced serial CT (nonionic contrast material was administered via the antecubital vein at a rate of 4 mL / s by using an autoinjector, 4 × 5 mm or 4 × 2.5 mm transverse scanning mode with stable table were performed. Sixteen series CT scans (16 scans each for the first and second series and one scan each for the rest series) were obtained during 9 min scanning period. Precontrast and postcontra attenuation attenuation on every scan was recorded . Perfusion, peak height and ratio of peak height of the SPN to that of the aorta were calculated. Perfusion was calculated from the maximum gradient of the time-attenuation curve and the peak height of th Results: No significant significant difference in the peak height was found between malignant (35.79 ± 10.76 Hu) and active inflammatory (39.76 ± 4.59 Hu) (t = 1.148, P = 0.255> 0.05). SPN-to-aorta ratio (14.27% ± 4.37) and perfusion values ​​(30.18 mL / min / 100 g ± 9.58) in malignant SPNs were significantly lower than those of active inflammatory (18.51% ± 2.71, 63.44 mL / min / 100 g ± 43.87) 2.978, P = 0.004 <0.05; t = 5.590, P <0.0001). Conclusion: The quantitative information about blood flow patterns of malignant and active inflammatory SPNs is different. SPN-to-aorta ratio and perfusion values ​​are helpful in differentiating malignant nodules from active inflammatory.