Objective To investigate the correlation between normal ascending aortic elasticity and the left ventricular function by 256 slice iCT.Methods 105 subjects who underwent CTA and echocardiography inspection and diagnosed with normal coronary artery and without ascending aortic atherosclerosis were collected.Subjects were divided into three groups according to age and two groups according to gender respectively.Left ventricular function parameter values on CT were measured, including ESV,EDV,SV,EF,CO and MM.The aortic elasticity on CT and echocardiography was measured and calculated respectively on cross-sectional area at 15 mm above aortic valve.The relationship between ascending aortic elasticity and the left ventricular function was evaluated.Results Bland-Altman plot revealed that there was a good conformity between CT and echocardiography in measurement the value of ascending aortic elasticity(ICC=0.988,P<0.05).In different grougs of age,normal ascending aortic elasticity was positively correlated with EDV,ESV,SV,EF and negatively correlated with MM.There was no correlation with the CO.There was a negative relationship between aortic elasticity and age(r=-0.546,P<0.05)

Purpose To explore the relationship between epicardial adipose tissue (EAT) volume and ascending aortic stiffness by CT,so as to early evaluate the lesions of ascending aortic by measuring EAT.Materials and Methods 169 patients with suspected coronary artery disease who underwent coronary CT angiography and coronary angiography in First Affiliated Hospital of Jinzhou Medical University from January 2016 to September 2016 were enrolled.According to the presence of coronary atherosclerosis or not,the patients were divided into research group (109 cases) and control group (60 cases).The research group were further divided into slight,mild,moderate and severe group according to the Gensini score of coronary atherosclerosis.The recorded threshold of EAT volume was 107.2 cm3.The patients with EAT volume higher than 107.2 cm3 belonged to the exposure group,and the rest belonged to the non exposure group.The EAT volume and ascending aortic stiffness were measured,and the relationship between them was assessed.The relationship between EAT volume and coronary atherosclerosis was also analyzed.Results In the control group,there was no correlation between EAT volume and ascending aortic stiffness (r =-0.156,P＞0.05).However,there were negative correlations between EAT volume and ascending aortic stiffness in slight,mild,moderate and severe group (r=-0.378,-0.340,-0.514 and-0.459,P＜0.05).The EAT volumewas an independent risk factor of ascending aortic stiffness (β=-0.009,t=-2.653,P＜0.05).The incidence of CAD in the exposure group was 9.318 times of that in the non exposure group.Conclusion There is obvious correlation between EAT volume and ascending aortic stiffness in patients with CAD.The evaluation of EAT volume can provide an effective reference for the early prediction of ascending aortic lesions in patients with CAD.

Objective To observe the value of dynamic contrast enhanced MRI(DCE-MRI)combined with intravoxel incoherent motion(IVIM)for preoperative evaluation on pathological type of rectal cancer.Methods Totally 81 patients with rectal adenocarcinoma were enrolled and divided into mucinous adenocarcinoma group(n=36)or non mucinous adenocarcinoma group(n=45)based on postoperative pathological results.Parameters of DCE-MRI and IVIM,including rate constant(Kep),volume transfer constant(Ktrans),extravascular extracellular volume fraction(Ve),true diffusion coefficient(D),pseudo diffusion coefficient(D*)and perfusion fraction(f)were compared between groups.Logistic regression analysis was performed,the efficacy of the above parameters for evaluation on pathological type of rectal cancer were explored.Results Kep,Ktrans,D*and f of mucinous adenocarcinoma group were all smaller than those of non mucinous adenocarcinoma group(all P＜0.05).Kep and f were both impact factors of pathological type of rectal cancer(both P＜0.05).The area under the curve(AUC)of Kep,f and Kep+f for preoperative evaluation on pathological type of rectal cancer was 0.774,0.880 and 0.906,respectively,with sensitivity of 69.44％,77.78％and 86.11％,specificity of 82.22％,91.11％and 91.11％,respectively.AUC of Kep was lower than that of Kep+f(P＜0.05).Conclusion DCE-MRI combined with IVIM could effectively evaluate the pathological type of rectal cancer preoperation.