Twelve healthy volunteers underwent ECG-triggered non-contrast-enhanced magnetic resonance venography(NCE-MRV)of lower extremities on a 1.5T MR scanner.Image quality was assessed quantitatively and qualitatively with a 17-segment model.ECG-triggered (NCE-MRV) was successfully performed in all patients.Mean signal to noise ratio and contrast to noise ratio of lower extremities were 66 ± 23 and 53 ± 22 respectively.Excellent and good image qualities were achieved in 62％ and 31％ of all segments respectively without non-evaluable segment.Thus ECG-triggered NCE-MRV of lower extremities is feasible with reliable image quality.

Objective To investigate the value of susceptibility weighted imaging (SWI) in the diagnosis of hemorrhagic diffuse axonal injury (DAI). Methods A retrospective study was conducted on 20 patients with DAI who received MRI examination at day 3 post-injury.MRI sequences included T1WI,T2WI,fluid attenuated inversion recovery ( FLAIR),diffusion weighted imaging (DWI) and SWI.There were 15 patients with the Glasgow Coma Scale (GCS) score≤8,three with GCS score of 9-12 and two with GCS of 13-15.The location and quantity of hemorrhage focus were counted.The area of hemorrhage focus was measured on each MR sequence.Differences of detection rate of hemorrhage focus on each sequence were compared by using X2 test.The correlation between DAI related bleeding area and GCS score was analyzed. Results DAI related hemorrhage focus showed a larger number in superficial cerebrum than that in posterior cranial fossa and in deep cerebrum.The detection rate of hemorrhage focus on SWI was the highest,as compared with other sequences ( P ＜ 0.05 ).Bleeding area and GCS score showed a negative correlation (r =-0.921,P ＜ 0.01 ). Conclusion SWI is very sensitive in detection of the intracerebral hemorrhage focus in the acute period of traumatic DAI.

Objective To evaluate the safety and clinical efficacy of stereotactic body radiation therapy (SBRT) for lung cancer.Methods A retrospective analysis was performed on 200 patients with primary non-small cell lung cancer (NSCLC)(118 patients) or solitary pulmonary metastasis (82 patients) who underwent SBRT in Zhejiang Cancer Hospital from January 2012 to September 2015.The 80% isodose line covered 95% of the planning target volume,and the 100% isodose line covered 100% of the internal gross tumor volume.The fractional dose was 4.0-18.0 Gy daily or every other day,and the biologically equivalent dose ranged from 40.0 to 151.2 Gy (median 100 Gy).Results All patients completed treatment.The follow-up rate was 96.0%.The complete response and partial response rates were 14.8%(17/115) and 65.2%(75/115) for the primary tumor group,versus 25%(19/77) and 38%(29/77) for the metastasis group.The incidence rates of grade Ⅱ and Ⅲ acute radiation pneumonitis were 4.7% and 3.1%,respectively.The median follow-up was 14.9 months.The 1-and 2-year local control rates were 95.7% and 84.3% for the primary tumor group,versus 92% and 73% for the metastasis group.The 1-and 2-year overall survival rates were 94.5% and 92.0% for the primary tumor group,versus 85% and 62% for the metastasis group.Conclusions SBRT is a safe and effective treatment for early primary NSCLC and solitary pulmonary metastasis,resulting in high 1-and 2-year local control and overall survival rates and low rate of complications.

Objective To investigate the clinical application value of the non-shared incentive diffusion weighted imaging(ZOOM-DWI)technique at cervical level in diagnosis of cervical spondylotic myelopathy(CSM).Methods A total of 49 CSM patients(patient group),and 50 healthy volunteers(control group)were recruited.All subjects underwent conventional MRI and ZOOM-DWI of the cervical spine and neurologic modified Japanese Orthopaedic Association(mJOA)scores in patients with CSM.The apparent diffusion coefficient(ADC)value in the spinal cord at the narrowest area(C5-C6)of the compression site of patients,the ADC value at the disc level in each upper and lower level,and the spinal ADC value at the cervical level C2-C3 were measured.The ADC values of control group C2-C3,C3-C4,C4-C5,C5-C6,C6-C7 were measured.Within-group comparisons of the spinal cord ADC values for each segment between patient and control groups were performed using analysis of variance and post hoc comparisons(SNK-q).The ADC values at the narrowest point of the patient group and control group were tested by independent sample t-test.The Pearson correlation analysis was performed between patients'C5-C6 ADC values and mJOA scores.Results The mean ADC values showed no significantly different levels in the control group.Among the ADC values at each measurement level in the patient group,except for C4-C5 and C6-C7 where the difference was not statistically significant,the remaining pair-wise comparisons all showed statisti-cally significant differences(F=24.368,P＜0.001),with the highest ADC value at C5-C6.The C5-C6 ADC value in the patient group was significantly higher compared to the control group(t=9.414,P＜0.001),with statistical significance.The ADC values at the patient stenosis showed a significant negative correlation with the mJOA score(r=-0.493,P＜0.001).Conclusion Cervical ZOOM-DWI technique can be applied to diagnose CSM,and spinal ADC values can be used as reliable imaging data for diagnosing CSM.

Objective To investigate the current status and characteristics of the immersion experience of medical students and related influencing factors. Methods The stratified random sampling method was used to conduct a survey using an immersion experience questionnaire among 732 medical students in a full-time university. Epidata 3.1 software was used for data double entry and management, and SPSS 19.0 statistical software was used for data processing and statistical analysis. The questionnaire internal consistency reliability test was used to assess the validity of the questionnaire and a logistic regression analysis was used to identify the influencing factors for the immersion experience of medical students. Results Learning immersion experience was at a moderate level among the medical students (3.13±0.64). Level of performance (OR=1.177, 95％CI=0.988-1.402), degree of satisfaction with learning (OR=1.674, 95％ CI=1.341-2.089), and professional interest (OR=2.153, 95％CI=1 . 776-2 . 610 ) were the positive influencing factors for learning immersion (P<0.05) and were positively correlated with learning immersion experience . Grade , source of origin , duty , learning stress , school satisfaction, and life satisfaction had no influence on learning immersion experience (P>0.05). Conclusion Learning immersion experience is at a moderate level among medical students. Improvement of medical students' performance, learning satisfaction,and professional interest helps to improve their immersion experience. Strengthening the attention to work immersion and enhancing learning immersion experience among medical students are beneficial to medical student education and cultivation of qualified medical talents.

Objective:To measure the level of medical students' sense of professional mission and test its influencing factors.Methods:Descriptive statistical analysis was used to evaluate the status quo of medical students' sense of learning mission, and multiple linear regression was used to analyze its influencing factors. SPSS 19.0 software was used to statistically analyze the data.Results:① The scores of medical students' sense of professional mission were (3.67±0.66) points. The scores of altruistic contribution, guiding force, meaning and value were all higher than 3 points and were close to each other, indicating that medical students had a good sense of professional mission. ② The regression analysis results showed that P values of the five variables of major interest, employment prospect, academic performance, major satisfaction and learning atmosphere were all less than 0.05, and the β coefficient was positive, indicating that the five independent variables had a positive correlation with the dependent variables of professional mission. Conclusion:Medical colleges and universities should strengthen the education of medical students' sense of professional mission and establish correct professional values of medical students, which help stimulate medical students' professional ethics of caring for life, saving lives and injuries.

Background Because of high working intensity, high responsibility, and unexpected situations, health care workers may suffer great work pressure, which may lead to health damage. Objective To explore the self-rated health status and its influencing factors such as demographic and occupational-related factors of medical staff in Lanzhou. Methods In-service medical staff were selected by using cluster random sampling method from 18 public hospitals in Lanzhou City and were investigated with a self-made questionnaire and the Self-rated Health Measurement Scale (SRHMS). SRHMS includes 48 items in 10 dimensions, which are divided into three sub-scales of physical health, mental health, and social health, and another independent dimension is overall health. The scores were converted into a percentage scale and expressed as the percentage of measured score to full score; a higher score indicated better health, and >70% was considered good health status. t test, Kruskal-Wallis H test, and Spearman correlation were used to analyze the scores of SRHMS and the demographic and occupational-related factors affecting the scores of physical, mental, and social health sub-scales. Results A total of 2989 valid questionnaires were recovered. There were statistically significant differences in total score and the scores of physical, mental, and social health among medical staff of different age, educational background, length of service, and weekly working hours groups (P < 0.05). The percentage of total score to full score in the medical staff was 71.41%, but the scores of physical, mental, and social health sub-scales and total scale of selected participants were all lower than the corresponding domestic norms (t=−3.323, −12.283, −7.157, −9.659, P < 0.05); the percentage of psychological symptoms and negative emotions in mental health scale to full score was the lowest, only 58.39%. Educational background, length of service, and weekly working hours were negatively correlated with physical health score (r=−0.061, −0.060, −0.165, P < 0.05); professional title was positively correlated with mental health score (r=0.045, P < 0.05), while educational background and weekly working hours were negatively correlated with it (r=−0.051, −0.172, P < 0.05). Monthly income, professional title, and length of service were positively correlated with social health score (r=0.040, 0.049, 0.071, P < 0.05), while educational background and weekly working hours were negatively correlated with it (r=−0.038, −0.110, P < 0.05). Conclusion The self-rated health status of selected medical staff in Lanzhou is generally good, but lower than that of the norm, especially the mental health score is the lowest. The self-rated health score of total scale is correlated with education, length of service, professional title, and working time per week.