Abstract: Objective To determine the diagnostic value of C T in pu lmonary tuberculosis.Methods An retrospective analysis were don e through comparing the clinical information,X-ray film and CT film of 98 patie nts with pulmonary tuberculosis.Results (1)Most of intrapulmonary lesions located in superior lobe apicoposterior segmen t and lower lobe dorsal segment, superior lobe anterior segment and lower lobe b asal segment.(2)The show rate of the lesions on chest CT films was significant h igher than that of X-ray films.(3)The show rates of focal calcification,inner- mediastinum lymph node enlargement,inner-mediastinum lymph node calcification, bullae of lung,pulmonary barotrama,pneumathorax in chest CT films were significa nt higher than that of X-films (P<0.05).(4)There was no significant differe nce on show rates for various shadows in CT films and X-ray films.Conclusion The value of chest CT for providing evidences for di agnosis of TB is very higher.

Key words: Tuberculosis,pulmonary/diagnosis, Tomography,X-ray computed