Objective To evaluate the information of head injury caused by the major earthquake of Wenehuan and the diagnostic value of muhi-slice spiral CT(MSCT). Methods A total of 1557 earthquake victims were hospitalized, of which head CT scan was performed in 292 eases, and abnormalities were found in 225 of them. The composition, type of injury and MSCT findings of head injury were retrospectively analyzed. Results CT abnormalities were found in 225 victims, including 66 cases of skull fracture,50 eases of cerebral contusion and laceration, 55 eases of intracranial hematoma, 16 cases of subaraehnoid hemorrhage, 16 eases of subdural collection of fluid,20 eases of foreign substance of scalp,and 2 eases of traumatic cerebral infarction. Operation was performed in 22 of them. Conclusion The incidence of head injury in earthquake was high, and most of them were not severe. The examination of MSCT was rapid, MPR and 3D images can clearly show the lesion of craniocerebral trauma. MSCT can provide more valuable information for clinical therapy in craniecerebral trauma caused by earthquake.

Objective To characterize pancreatic perfusion in swines with experimental chronic pancreatitis(CP)by dynamic contrast-enhanced MRI and to correlate it with the severity of CP.Methods Twenty-two swines were randomly selected and made CP by ligation of main pancreatic duct.Six healthy swines served as control.MR perfusion study with dynamic contrast-enhanced MRl was carried out on the swines under anesthesia.The animals were euthanized after MR perfusion exam.The swines were divided into 4 groups according to the histological results of pancreas:normal group,group of CP of grade 1,group of CP of grade 2,and group of CP of grade 3.The maximum perfusion slope rate,the time-to-peak value and the maximum enhancement rate was compared between the groups using variance analysis,and the relationship between each perfusion parameters and severity of CP was made by correlative analysis.Results Twenty-one swines underwent MR perfusion study,including 7 swines in normal group,7 in group of grade 1 CP,3 in group of grade 2 CP,and 4 in group of grade 3 CP.On signal intensity time curve(SI-T)derived from MR perfusion weighted imaging,the m~imum slope rate was(10.88±1.20)%,(10.59±1.02)%,(6.67±1.31)%,and(5.48±1.97)%for normal swines,swines with grade 1 CP,swines with grade 2 CP and swines with grade 3 CP,respectively(F=20.51,P＜0.05).The time-to-peak value was(13.82±3.09)s,(12.31±5.52)s,(20.55±3.79)s and(37.26±14.56)s respectively(F=10.68,P＜0.05).The maximal signal enhancement rate was(62.95±20.20)%,(60.44±20.00)%,(46.33±22.70)%,and(67.65±32.66)%,respectively(F=0.53,P＞0.05).The highest slope value(r=-0.72,P＜0.05)and the time-to-peak(r=0.54,P＜0.05)of the SI-T curve were correlated to the severity of CP,respectively.However there was no linear correlation between the maximal signal enhancement rate and the severity of CP.Conclusion MR perfasion weighted imaging has a potential to diagnose and to grade experimental chronic pancreatitis.

Objective To investigate the effect of cone beam CT with DynaCT on liver cancer patients undergoing transcatheter arterial chemoembolization (TACE) and its influence on the prognosis of patients. Methods A total of 73 patients with primary liver cancer who attended The Second Affiliated Hospital of North Sichuan Medical College from May 2017 to May 2019 were enrolled and randomly divided into observation group with 38 patients and control group with 35 patients. The patients in the control group underwent TACE under 2D-DSA angiography, and those in the observation group underwent DynaCT angiography after 2D-DSA angiography. The two groups were compared in terms of time of operation, X-ray exposure, amount of contrast agent used, intrahepatic tumor lesions detected and blood supplying arteries displayed by 2D-DSA angiography versus DynaCT angiography, and lipiodol deposition in tumor lesions evaluated by postoperative two-dimensional X-ray fluoroscopy versus plain DynaCT scan. The two-independent-samples t test was used for comparison between two groups, and the chi-square test was used for comparison of categorical data between two groups; the Kaplan-Meier survival curve was plotted for survival analysis, and the log-rank test was used for comparison between two groups. Results There were no significant differences between the two groups in time of operation, X-ray exposure, and amount of contrast agent used (all P >0.05). For the observation group, a total of 93 tumor lesions were detected, among which 79 (84.95%) were positive for blood supplying arteries, while in the control group, a total of 61 tumor lesions were detected, among which 34 (55.74%) were positive for blood supplying arteries, suggesting that the proportion of lesions positive for blood supplying arteries in the observation group was significantly higher than that in the control group ( χ 2 =16.088, P < 0.05). After surgery, 113 lesions of the two groups were analyzed for lipiodol deposition; two-dimensional X-ray fluoroscopy showed that lipiodol was evenly deposited in 89 lesions and was partially or completely missing in 24 lesions, while plain DynaCT scan showed that lipiodol was evenly deposited in 78 lesions and was partially or completely missing in 35 lesions. The observation group had significantly better overall survival than the control group ( χ 2 =4.347, P =0.037). Conclusion DynaCT can increase the detection rate of ischemic lesions and overlapping lesions in the liver without increasing the amount of intraoperative X-ray exposure and contrast agent used, thereby improving the accuracy of intubation and reducing the patient's vascular injury, and at the same time, it can be used to evaluate the deposition of lipiodol after embolization. It has an important application value in TACE for liver cancer and can help to improve the survival of patients after surgery.