Abstract: Objective  In contrast to DSA angiography, we prospectively analyze the accuracy of the dual-input lung perfusion CT technique (DICTp) to detect and locate hemodynamic abnormalities in tuberculosis hemoptysis patients and the correlation between the abnormal perfusion lung segments and the amount of hemoptysis.  Methods  Thirty-one consecutive cases of patients with tuberculosis complicated with hemoptysis underwent dual-input lung perfusion CT scan just before DSA. And then, the CT perfusion parameters at every segment of lung were recorded and compared with those of DSA, supposing DSA diagnostic imaging as the gold standard.  Results  We observed 558 lung segments in the 31 cases and found 200 positive lung segments in DSA imaging. DICTp disco-vered all the 200 positive lung segments.We considered the perfusion index (PI) as the most significant indicator for the diagnosis. When the critical value is 92.75, the sensitivity is 91.9% and specificity is 89.6%. The number of abnormal perfusion lung segment and the level of hemoptysis show medium correlation and the correlation coefficient is 0.605.  Conclusion DICTp can detect and locate pulmonary abnormal blood flow in hemoptysis patients with tuberculosis accurately and sensitively and the number of abnormal perfusion lung segment and the level of hemoptysis show medium correlation.

Key words: Tuberculosis, pulmonary/radiography, Tuberculosis, pulmonary/complications, Hemoptysis, Tomography, X-ray computed, Hemodynamics