Objective To investigate CT findings and diagnosis,follow-up value in the chest closed pulmonary contusion.Methods The clinical and imaging data of 56 patients with pulmonary contusion were retrospectively analyzed.Results 23caseswithX-raycheck,18caseswerefoundpulmonarycontusion,and five cases were negative.CT found 56 cases of pulmonary contusion involving 13 cases of the right lung,8 cases of the left lung,35 cases of both lungs involved,a total of 135 lung lobes involvement.CT performance can be divided into three types,interstitial pulmonary contusion in 13 cases(23.2％),the substance of the pulmonary contusion in 31 cases(55.4％),the mixed pulmonary contusion in 12 patients (21.4％).After treatment,interstitial pulmonary contusion lesions were completely absorbed after 1 ～ 3 days,lesions began to absorb in the substance and mixed pulmonary contusion after 1 week and absorbed completely 3 weeks after treatment.Six cases left over from fibrosis lesions and pleural adhesions hypertrophic changes.Conclusion CT is helpful for early diagnosis of pulmonary contusion,it is the best imaging method in understanding its severity and dynamic track review of pulmonary contusion,the CT classification has important guiding value in clinical conditions and duration judgment.

Objective To evaluate the value of multi-slice CT (MSCT) and post-processing techniques in the diagnosis of sternal fractures. Methods MSCT volumetric scanning was performed in 36 patients with sternal fractures, multi-pla-nar reconstruction(MPR) and volume rendering(VR) were reconstructed at workstation, CT findings of injured sternal were analyzed comparatively with that of radiography by two experienced radiologists. Results There were sternal body fracture in 28 cases, manubrium fracture in 7 cases and xyphoid process fracture in 1 case. 24 cases were diagnosed definitely and 12 cases were missed by radiography, the diagnosis rate of radiography was 66.7%, the diagnosis rate of MSCT technology combined with post-processing of MPR, VR images was 100.0%, there was significant difference in the diagnosis rate of MSCT technology than that of radiography (字2=14.40, P<0.05). Conclusion MSCT vol-umetric scanning combined with post-processing of MPR, VR images not only can show the location and type of ster-nal fractures but also can show other associated injuries, it has an important value in diagnosis and treatment of sternal fractures and should be the modality of choice for diagnosis of sternal fractures.