Objective:To investigate the value of CT perfusion imaging combined with CT angiography in predicting the progression of transient ischemic attack (TIA) to acute cerebral infarction (ACI).Methods:150 patients with TIA admitted to our hospital from March 2019 to August 2022 were selected. All patients underwent CT perfusion imaging and CT angiography within 24 hours after admission. They were divided into ACI group and non-ACI group according to whether ACI occurred within 7 days after the onset of the disease. CT perfusion imaging parameters [cerebral blood volume (CBV), cerebral blood flow (CBF), mean transit time (MTT), time to peak (TTP)] and angiographic characteristics were compared between ACI group and non-ACI group. Draw receiver operating characteristic (ROC) curve to analyze the predictive value of CT perfusion imaging combined with CT angiography for TIA patients' progression to ACI.Results:The incidence of ACI in TIA patients was 18.67% (28/150). CBV and CBF in ACI group were lower than those in non ACI group (P < 0.05), and MTT and TTP were higher than those in non ACI group (P < 0.05). The degree of vascular stenosis in ACI group was higher than that in non ACI group (P < 0.05). The sensitivity, specificity and area under the curve (AUC) of CBV, CBF, MTT and TTP in predicting the progression of TIA patients to ACI were 78.57%, 88.52% and 0.824 respectively, and the AUC predicted by CBV, CBF, MTT and TTP was higher than that predicted alone. The AUC and sensitivity of CT perfusion imaging combined with CT angiography in predicting the progression of TIA to ACI were higher than those predicted alone (P < 0.05), but there was not statistically significant compared with that predicted alone (P > 0.05).Conclusions:CT perfusion imaging and CT angiography have a certain predictive value for the progression of TIA patients to ACI, but the combined predictive value is higher.

Objective To explore diagnostic value and clinical significance of multi -slice spiral CT (MSCT) in the pathogeny of celiac abscess.Methods Twenty-one patients with celiac abscess undergoing surgery ,puncture and clinical follow -up from July 2014 to July 2016 in People's Hospital of Bozhou were retrospectively analyzed .Combined with multi-planar reconstruction (MPR) of MSCT,the distribution characteristics and MSCT manifestations of abdominal abscess of different etiology were observed and analyzed .Results The diagnostic accuracy of celiac abscesses was 100% and the accuracy of qualitative diagnosis was 95.2% (20 /21) by using MSCT combined with MPR.Among them,12 cases were appendicitis abscess .MSCT showed that the abscess was mainly located around the il -eocecal region,and gas or gas-liquid plane was formed in the abscess .6 cases were caused by perforation of alimentary tract .MSCT showed perforation changes in the perforation area of the digestive tract and abscess formation .Enhanced CT showed uniform smooth ring abscess wall enhancement ,and some parts of the surrounding abscess can be found around the free gas shadow .One case was caused by gallstone and cholecystitis perforation .MSCT displayed thickening and hydrops of gallbladder -wall.Interruption of gallblad-der-wall could be shown in the defect .Two cases were caused by encapsulated abscesses .MSCT manifested abscesses around high den -sity foreign body,the walls of abscess obviously enhanced ,and the foreign body did not strengthen .Conclusions MSCT plain scan and enhanced scan combined with MPR can find early celiac abscess ,and analyze the cause of celiac abscess ,which provides a significant reference for clinical treatment.