0.05). ③The entrance point of screw was designed based on the obtained data. Sixty screws were all inserted into pedicles successfully. CONCLUSION: L1-5 superior margin root of spinous process locates in superior and inferior planes of vertebral pedicle with stable anatomic relationship; in addition, there are no significant differences between plain tomography and CT films. It provides anatomic data for pedicular operation.

Objective To observe the effect of different conserve time in ultra deep cryopreservation (-196 ℃)on physiological characteristics of allograft nerve transplantation .Methods A total of 80 female Wistar rats were divide into three groups by random principle:derived group which 20 rats were sacrificed to get both sides of femoral nerves ;control groups which each group had 10 rats include group A for fresh autologous nerve transplantation ,group B for fresh allograft nerve transplantation ;experiment groups which each group had 10 rats including groups C ,D ,E ,F that transplanted after femoral nerves conserve in the -196 ℃ for 3 ,6 ,9 , 12 weeks respectively ,and the results of exterior appearance ,light microscope ,electron microscope were observed and electrophysi-ological test was conducted after transplantation .Results After 9 weeks transplantation :the physiological characteristics of group B was most affected ,followed by group C ,D ,E ,F ,group A was with minimal impact ;the result of electrophysiological test showed that groups A&B ,A&E ,A&F had significant difference(P<0 .05) .Conclusion The physiological characteristics of allograft nerve transplantation relate to the freezing time .

Objective To evaluate MDCT findings and characteristics of metastatic pancreatic tumors. Methods A total of 23 cases with metastatic pancreatic tumors were collected and the CT findings including the size, number, location, density patterns, enhancement patterns and secondary signs (dilatation of the pancreatic duct and/or bile duct, involvement of peripancreatic vessels, atrophy of distal pancreas) were analyzed retrospectively. Results A total of 35 metastatic pancreatic tumors were identified in the 23 patients. Tumors were multiple in 7 patients, the other 16 patients had single metastatic pancreatic tumor. The mean maximum diameter of the tumors was 3. 3 cm; the majority was located in the pancreatic body/tail. Thirty tumors demonstrated no enhancement in the arterial phase, and in the portal phase 23 tumors were hypodensive compared with normal pancreatic tissue, 4 tumors were isodense and 3 tumors showed a peripheral rim of enhancement. Five tumors showed markedly enhancement in the arterial and portal phase. Only 1 patients had dilated biliary and pancreatic duct, and 2 patients had dilated pancreatic duct. Only 1 case demonstrated involvement of splenic vein. 13 of the 23 patients had extra-pancreatic metastasis. Conclusions Pancreatic metastasis showed certain imaging characteristics. The accuracy of CT diagnosis could be improved by understanding of these CT findings and clinical features.

Objectives To explore the relationship between illness perceptions and health behavior in the subjects. Methods Revised illness perception questionnaire and health promoting lifestyle profileⅡ (HPLPⅡ) were used to measure 101 patients′illness perception and health behavior between the groups. Results The HPLPⅡscore of LEAD was(2.17 ± 0.29) with the score of dimension. The course of disease, prognosis and perception of emotion were negatively related to health behaviour; personal control and primaty congtion of drsease were postively related to health behaviour (all P<0.01). Conclusion Medical personnel should pay attention to the relationship between illness perceptions and health behavior in patients with LEAD and effective measures should be taken to improve the patients′illness perceptions, promote their choices and persistence in health behavior and improve the quality of life.

Objective To analyze quantitatively intravoxel incoherent motion diffusion weighted imaging (IVIM-DWI)of normal adult kidney and to evaluate the effects of the location of the kidney,gender and age on IVIM-DWI parameters.Methods Thirty healthy adult volunteers were recruited to undergo IVIM-DWI examination.Two radiologists measured the D ,D? and f values of renal parenchyma in both the upper pole,middle part and lower pole of the kidneys separately.Results The D ,D? and f values of the middle part of kidneys in healthy adult were(1.61±0.1 6)×10 -3 mm2/s,(1 7.45 ±3.78)×10 -3 mm2/s and (26.88 ±5.1 9)%, respectively.The D values of right kidney were higher than that of left kidney (P <0.05).The f values of normal kidney in male volunteers were higher than that of female (t = 3.321,P =0.001).The D values of normal kidney in > 50 years group were lower than that of ≤50 years group (t = 3.548,P=0.001).D value of the kidney and age was negatively correlated (r=-0.406).Intraclass correlation coefficient of D,D? and f values between two observers were 0.881,0.56 and 0.741,respectively.The consistency of two observers in measurement of IVIM-DWI parameters in the middle part of kidneys was higher than that of the upper pole and lower pole of the kidneys.Conclusion The IVIM-DWI parameters of adult normal kidneys are influenced by different parts of the kidney,gender and age.

Objective:To evaluate the clinical value of 5.0 T ultra-high filed MRI system in assessing intracranial arteries segments and vessel branchers.Methods:This study was a prospective study. Totally 40 consecutive healthy volunteers were recruited from Zhongshan Hospital, Fudan University from September 1, 2021 to November 30, and all participants who underwent either 3.0 T or 5.0 T time-of-flight MR angiography (TOF-MRA) in random order were divided into 3.0 T MR group and 5.0 T MR group with 20 volunteers for each group. Image quality was assessed by Likert 5 scoring systems and signal-to-noise ratio (SNR), contrast-to-noise ratio (CNR),and score in visualization of intracranial arteries [middle cerebral artery (MCA) and its segments, anterior cerebral artery (ACA) and its segments, posterior cerebral artery (PCA) and its segments, lenticulostriate arteries (LA) and pontine artery (PA)] were assessed from 0 to 3 (≥2: good depiction of vessel segment). Quantitative indicators were compared between 2 groups using independent t test or Mann-Whitney U test. Results:Among the 40 subjects, there were 29 males and 11 females, aged 20-69 (50±12) years. SNR and CNR were both significantly higher in 5.0 T MR group than those in 3.0 T MR group (SNR: 187±9 vs 91±4, t=31.59, P<0.001; CNR: 156±7 vs 70±4, t=31.45, P<0.001), but there was no significant difference in subjective scores of image quality between the 5.0 T MR and 3.0 T MR groups [5.0 (4.0, 5.0), 5.0 (5.0, 5.0) points, respectively, Z=-1.23, P=0.218]. In the evaluation of cerebral arteries, the visualizations of the proximal and middle segments of MCA, ACA and PCA was better than those in the 3.0 T MR group, and there was no significant difference in the scores ( P>0.05), while the visualizations of proximal arteries in the 5.0 T MR group were significantly better than those in the 3.0 T MR group ( P<0.05). Furthermore, small vessel branches such as LA and PA in 5.0 T MR group were visualized better than those in 3.0 T MR group ( P<0.001). Conclusion:TOF-MRA by ultra-high filed 5.0-T provides an optimal choice in visualization of distal large arteries and small vessel branches, which could be useful for the diagnosis on cerebral vascular disease.

Objective To investigate the value of intravoxel incoherent motion diffusion-weighted imaging(IVIM-DWI)and multi-phasic enhanced MRI in the classification of clear cell renal cell carcinoma(ccRCC).Methods The data of 91 patients with pathologically confirmed ccRCC who all underwent multi-phasic enhanced MRI and IVIM-DWI examination were analyzed retrospectively. According to Fuhrman classification criteria,grade Ⅰ - Ⅱ were defined as low-grade group(n=73),grade Ⅲ - Ⅳ were defined as high-grade group(n=18).Mann-Whitney U test,independent sample t test and receiver operating characteristic(ROC)analysis were used for statistical analysis.Results The maximal diameter and pathological stage of ccRCC in the low-grade group were lower than those in the high-grade group,and the differences between the two groups were statistically significant(P<0.001 and P=0.003). The signal intensity and enhancement rate of ccRCC in the high-grade group in corticomedullary phase and parenchyma phase were lower than those in the low-grade group,but there was no significant difference between the two groups(all P>0.05).The ADC and D values of ccRCC in the high-grade group were lower than those in the low-grade group,and the differences between the two groups were statistically significant(P=0.007 and P=0.009).However,there was no significant difference of D *and f between the two groups(P=0.604 and P=0.695).Conclusion Multi-phasic enhanced MRI scanning has a limited value in the classification of ccRCC.IVIM-DWI derived diffusion-related parameters(ADC and D)is of great significance for differentiating between high-grade and low-grade ccRCC.