Efficiencies of combined examination of different CT image post-processing techniques in diagnosis of aortic dissection
Objective:To analyze efficiencies of different CT image post-processing techniques in the diagnosis of aortic dissection(AD).Methods:A prospective study was conducted on 196 patients with suspected AD admitted to the hospital from August 2019 to August 2021.All patients underwent CT,magnetic resonance imaging(MRI)examination and AD classification evaluation after admission.Using the MRI results as the'gold standard',the efficiencies of different CT image post-processing techniques[multi-plane reconstruction(MPR),volume rendering(VR),surface reconstruction(CPR)]in the diagnosis of AD and the detection rates of AD classification were compared.Results:Among the 196 patients with suspected AD,142 cases were diagnosed as positive by MRI(25 cases of type Ⅰ,33 cases of type Ⅱ,84 cases of type Ⅲ),and 54 cases were negative.MPR examination showed 118 positive cases and 78 negative cases.VR examination diagnosed 102 cases positive and 94 cases negative.CPR showed 124 positive cases and 72 negative cases.The combined examination of MPR,VR and CPR diagnosed 139 cases positive and 57 cases negative.The sensitivity,accuracy and negative predictive value of MPR,VR and CPR combined examination in the diagnosis of AD were higher than those of the three single examinations,the missed diagnosis rate was lower than that of the three single examinations,and the differences were statistically significant(P<0.05).The detection rate of MPR,VR and CPR combined examination for type Ⅱ and Ⅲ AD was the highest,it was higher than that of MPR and VR single examination,and the differences were statistically significant(P<0.05).Conclusions:The efficiency of combined examination of MPR,VR and CPR in the diagnosis of AD is higher than that of single examination of the three.