Objective:To investigate the clinical significance of quantitative detection of myocardial edema in acute myocardial infarction based on T 2 mapping. Methods:From July 2018 to February 2019, a total of 20 patients (observation group) who underwent cardiac MRI after interventional therapy in the People's Hospital of Wenzhou were enrolled.Another 20 healthy volunteers were selected as the control group.The image data of the observation group were collected, and the image data were post-processed.The T 2 value, edema area and microcirculation obstacle area of the infarcted myocardium and its contralateral normal myocardium were measured and recorded by the image information.The infarcted myocardium and the contralateral normal myocardium were recorded.The T 2 values were compared and the cardiac MRI, cardiac function, serological markers and heart failure related products of the two groups were compared. Results:The patients in the observation group underwent self-comparison between infarcted myocardium and normal myocardium.The T 2 value of the distal infarcted myocardium was (90.14±.51)ms, which was greater than that of the normal myocardium [(60.71±5.15)ms], the difference was statistically significant( t=8.49, P<0.05). The number of myocardial microvascular obstruction (MVO) in the observation group was 17 cases, which in the control group was 0 cases, the difference was statistically significant (χ 2=41.45, P<0.05). The left ventricular end-diastolic volume of the observation group[(88.5±16.2)mL] was higher than that of the control group[(72.4±15.1)mL], and the difference was statistically significant ( t=12.51, P<0.05). The ejection fraction of the observation group was (54.1±11.2)%, which was lower than that of the control group [(71.2±7.9)%], and the difference was statistically significant ( t=18.71, P<0.05). The T 2 value of the observation group was (69.4±6.4)ms, which was higher than that of the control group[(55.2±11.4)ms]( t=11.98, P<0.05). The degree of myocardial delayed imaging (LGE) in the observation group was 13%, which in the control group was 0%, the difference was statistically significant ( Z=27.62, P<0.05). T 2 mapping showed that myocardial infarction sensitivity and positive predictive value were higher, but its specificity was relatively low. Conclusion:Quantitative T 2 mapping has high clinical value in the evaluation of myocardial edema after acute myocardial infarction.T 2 mapping can be used to analyze the extent of lesions in patients with acute myocardial infarction.

Objective To investigate the diagnostic value of multidirectional diffusion weighted image (DWI) and apparent diffusion coefficient(ADC) image in acute brainstem infarction.Methods 24 cases of brainstem infarction included 2 cases in super acute stage,22 cases in acute stage.All cases were performed multidirectional DWI,ADC and T1 WI、T2 WI examination including of 2 cases of midbrain,21 cases of pons and 1 case of medulla.All of them were accompanied with infarction of other location.Results Among 24 cases there were 13 cases that their lesions displayed clearly and established by transverse T2WI,transverse、coronary or sagittal DWI、ADC and the diagnostic accuracy was 54.2%.In other 9 cases(37.5%) could not display the signal and extent of the lesions,but they could be confirmed by transverse、coronary or sagittal DWI 、ADC.Moreover there were 2 cases(8.3%) who were indicated accurately the diagnosis by coronary、sagittal DWI 、ADC.Conclusion Multidirectional DWI and ADC could show the location of lesions in the lower brainstem so the multidirectional DWI and ADC scan could be an excellent method for the diagnosis of the brainstem infarction.