Magnetic induction method aims at the noninvasive detection of liver iron overload by measuring the hepatic magnetic susceptibility. To solve the difficulty that eddy current effects interfere with the measurement of magnetic susceptibility, we proposed an improved coil system based on the static field magnetization principle in this study. We used a direct current excitation to eliminate the eddy current effect, and a rotary receiver coil to get the induced voltage. The magnetic field for a cylindrical object due to the magnetization effect was calculated and the relative change of maximum induced voltage was derived. The correlation between magnetic susceptibility of object and maximum magnetic flux, maximum induced voltage and relative change of maximum induced voltage of the receiver coil were obtained by simulation experiments, and the results were compared with those of the theory calculation. The contrast shows that the simulation results fit the theory results well, which proves our method can eliminate the eddy current effect effectively.
Computer Simulation ; Humans ; Image Processing, Computer-Assisted ; Iron Overload ; diagnosis ; Liver ; physiopathology ; Magnetic Fields ; Magnetics ; instrumentation

Objective To investigate the key technical points of microvascular decompression (MVD)for the treatment of primary glossopharyngeal neuralgia (GPN)and its efficacy. Methods From July 2011 to October 2016,18 consecutive patients with primary GPN treated with MVD at the Department of Neurosurgery,Xuanwu Hospital,Capital Medical University were enrolled retrospectively. All patients received magnetic resonance angiography (MRA)examination before procedure. The anatomical relationship between glossopharyngeal nerve / vagus nerve and peripheral blood vessels were identified. Seventeen of them were treated via suboccipital retrosigmoid approach,one were treated via far lateral approach. None of the patients were treated with nerve root rhizotomy. Results Eighteen patients had paroxysmal severe pain in tongue,pharynx,tonsil or deep ear canal and other parts before procedure. Preoperative MRA indicated and confirmed in the surgery that the offending vessels were the trunks or their branches of the posterior inferior cerebellar artery in this group of patients. During the operation,the offending vessels were removed from the out brainstem areas of the glossopharyngeal nerves and vagus nerves under the direct vision in order to ensure that the blood vessels and nerves no longer contacted with each other. There were no complications, such as disability and death,cerebrospinal fluid leakage,and intracranial infection. All the patients were followed up after procedure;the mean follow-up period was 1-62 months. The symptom of pain disappeared completely in 17 of them. The Numberical Rating Scale (NRS)score for pain were 0. The pain in one patient was not relieved. The NRS score was 8 at discharge;it was the same as before procedure. Three patients had mild hoarseness,throat discomfort after procedure. They were relieved gradually in the follow-up period. Conclusion MVD is a safe and effective method for the treatment of GPN. Posterior inferior cerebellar artery is the most common offending artery. Preoperative imaging examination and clear decompression during the procedure are very important. The cutting off of glossopharyngeal nerves and vagus nerves needs to be handled with care.

Objective To discuss the feasibility and accuracy of dual-source CT ( DSCT) in the evaluation of aortic stenosis ( AS) with transthoracic echocardiography ( TTE) as reference.Methods A total of 53 patients who underwent both DSCT and TTE were prospectively evaluated.All of them were assessed by TTE for aortic stenosis.Maximum aortic valve area ( AVA) in systolic phase was measured with DSCT , and was compared to that index obtained from the continuity equation on TTE.The severity of AS was graded as mild , moderate , or severe according to the AVA.Linear regression analysis and Bland-Altman plots were used to compare the AVA measured by using CT and TTE.Agreement on semi-quantitative grades of AS severity between the two methods was tested by using Kappa statistics.Results The mean AVA using DSCT was (1.45 ±0.35 ) cm2 compared to the mean AVA of ( 1.33 ±0.36 ) cm2 using TTE, with a significant correlation between them (r=0.92,P<0.01).Bland-Altman analysis demonstrated good inter-modality consistency between DSCT and TTE.However , DSCT demonstrated a slight overestimation of the AVA compared to TTE.As identified by TTE, there were 53 patients with AS, 13 with mild AS, 21 with moderate AS , and 19 with severe AS.In 3 patients DSCT showed no AS , TTE detected mild AS.In 6 cases, TTE had graded the stenosis as moderate , but the stenosis degree was graded as mild using DSCT.Kappa analysis showed a good agreement between the two methods on semi -quantitative grades of aortic stenosis severity (Kappa=0.75,P<0.01).Conclusion AVA measurements using DSCT is feasible and reasonably accurate for those patients with moderate to severe aortic stenosis.

Objective To investigate the effect of neuropeptide Y (NPY) on the osteoblastic differentiation of murine MC3T3-E1 cells and its mechanism related to the Wnt signaling pathway.Methods The murine MC3T3-E1 cells were divided into 4 groups according to the stimulators added:phosphate buffered saline (PBS) (control) and different concentrations of NPY (10-8 mol/L,10-10 mol/L and 10-12 mol/L).The cellular proliferation was detected with MTT assay after 1,3,5,7 and 9 days.The cells were identified with cell immunochemistry and Western Blot to find out the most effective concentration of NPY at different time points under osteoblastic condition.The cells were then divided into 4 groups:PBS,NPY,NPY + NPY receptor antagonist,and NPY + DKK1.Western blot was used to determine the expression of β3-catenin and p-GSK-3β in each group.Nuclear signaling activity of β3-catenin was observed using immunofluorescence staining.Results NPY significantly improved the proliferation of MC3T3-E1 cells at 7 and 9 days (P ＜0.05).NPY (10s mol/L and 10-10 mol/L) groups and NPY (10-10 mol/L and 10-12 mol/L) groups significantly improved the ALP activity at 4 and 14 days respectively (P ＜ 0.05).At 4 days,the expression of ALP protein was significantly decreased in the NPY + DKK1 group and the NPY + NPY receptor antagonist group compared with that in the NPY group (P ＜ 0.05).Although the expression levels of [β-catenin and p-GSK-3β protein were uninfluenced in either case,NPY significantly stimulated the nuclear signaling activity of β3-catenin.Conclusions NPY may significantly increase the expression of ALP protein in MC3T3-E1 ceils during osteoblastic differentiation.This effect might be mediated through the canonical Wnt signaling pathway.

Objective:To explore the experience and inner feeling of self-nutrition management in patients with nasopharyngeal carcinoma undergoing radiotherapy and chemotherapy based on health action process approach (HAPA) model as the theoretical foundation.Methods:This study was a qualitative sutdy. Using the purposive sampling method, the semi-structured interview was conducted on 15 nasopharyngeal carcinoma patients with radiotherapy and chemotherapy in Department of Tumor Center Area 2 in the Second Affiliated Hospital of University of South China. Colaizzi 7-step analysis method was used to analyze the original data.Results:According to the two stages of HAPA model, three themes were extracted, namely, positive cognition of self-nutrition management, difficulty in self-nutrition management and lack of self-nutrition management ability.Conclusions:Medical staff should analyze individual differences among patients, understand their subjective feelings, confusion and needs for self nutrition management, provide personalized nutrition education and support, improve their self nutrition management experience and enhance their self nutrition management abilities.

Through the expert questionnaire (Delphi Indagate) to form Traditional Chinese Medicine (TCM) Healthy Lifestyle Guiding Principles.We conducted two rounds of surveys of TCM experts in the field of preventive health care on the basis of previous literature research.This study was aimed to form the framework in order to entry to the TCM Healthy Life-style Guiding Principles.The results showed that the positive coefficient of experts in two rounds of investigation were 84.31％ and 100％,respectively.The authoritative decree were both more than 0.7.The expert opinion score mean median was 9.21 and 9.085.Median mean values were 7.965 and 7.925.The median scores of full marks were higher than 65.12％ and 66.67％.The minimum coefficients of variation were 0.11 and 0.10.It was concluded that in the investigation and study,the enthusiasm of the experts,professional standards and credibility were high.Expert opinion is more concentrated.Expert opinion is well coordinated and gradually converges through two rounds of surveys.Through the Delphi indagate,the basic framework and items of TCM guiding principles of healthy lifestyle were established,which laid the foundation for further standardizing the guiding principles of TCM in healthy lifestyle.

Objective Analyze and compare the therapeutic value of contrast-enhanced ultrasound (CEUS) and enhanced spiral CT in patients with primary hepatocellular carcinoma (PHC) undergoing transcatheter arterial chemoembolization (TACE). Methods A retrospective analysis was conducted on 108 PHC patients (122 lesions) treated at Beijing Shijitan Hospital affiliated with Capital Medical University from July 2021 to June 2023. All patients were treated with TACE. After treatment, CEUS and contrast-enhanced spiral CT examinations were performed to evaluate the inactivation status of tumor lesions, with pathological results as the gold standard. The receiver operating characteristic curve and decision tree model were used to comprehensively evaluate the diagnostic value of CEUS, contrast-enhanced spiral CT, and their combination in PHC. Results The pathological results showed that 79 lesions remained active (positive) and 43 lesions were completely inactivated (negative). The areas under the receiver operating characteristic curve for evaluating PHC treatment efficacy by CEUS, contrast-enhanced spiral CT, and their combination were 0.975, 0.918, and 0.994, respectively. The sensitivity, positive predictive value, and actual application accuracy of CEUS and the combined method were higher than those of contrast-enhanced spiral CT (P < 0.05). A decision tree diagnostic model for PHC treatment efficacy was constructed using CEUS, contrast-enhanced spiral CT, and their combination as independent variables and PHC treatment efficacy as the dependent variable. The misjudgment rates were 3.3%, 10.7%, and 0.8%, respectively, and the prediction accuracy was 96.7%, 89.3%, and 99.2%, respectively. Conclusions CEUS and the combination of CEUS and contrast-enhanced spiral CT have high evaluation value for PHC treatment efficiency.

Objective Analyze and compare the therapeutic value of contrast-enhanced ultrasound (CEUS) and enhanced spiral CT in patients with primary hepatocellular carcinoma (PHC) undergoing transcatheter arterial chemoembolization (TACE). Methods A retrospective analysis was conducted on 108 PHC patients (122 lesions) treated at Beijing Shijitan Hospital affiliated with Capital Medical University from July 2021 to June 2023. All patients were treated with TACE. After treatment, CEUS and contrast-enhanced spiral CT examinations were performed to evaluate the inactivation status of tumor lesions, with pathological results as the gold standard. The receiver operating characteristic curve and decision tree model were used to comprehensively evaluate the diagnostic value of CEUS, contrast-enhanced spiral CT, and their combination in PHC. Results The pathological results showed that 79 lesions remained active (positive) and 43 lesions were completely inactivated (negative). The areas under the receiver operating characteristic curve for evaluating PHC treatment efficacy by CEUS, contrast-enhanced spiral CT, and their combination were 0.975, 0.918, and 0.994, respectively. The sensitivity, positive predictive value, and actual application accuracy of CEUS and the combined method were higher than those of contrast-enhanced spiral CT (P < 0.05). A decision tree diagnostic model for PHC treatment efficacy was constructed using CEUS, contrast-enhanced spiral CT, and their combination as independent variables and PHC treatment efficacy as the dependent variable. The misjudgment rates were 3.3%, 10.7%, and 0.8%, respectively, and the prediction accuracy was 96.7%, 89.3%, and 99.2%, respectively. Conclusions CEUS and the combination of CEUS and contrast-enhanced spiral CT have high evaluation value for PHC treatment efficiency.

【Objective】 To analyze the demographic characteristics of whole blood donors who responded to blood donation initiatives launched by our blood center, so as to formulate an efficient recruitment strategy and provide scientific reference for solving seasonal, structural and acute blood supply tensions in this region. 【Methods】 Such characteristics as age, gender, household registration, occupation, blood type, education level, number of blood donations, blood donation location and recruitment method of 21 934 whole blood donors who responded to donation appointments issued by our blood center during January 2019 to June 2020 were analyzed, and the corresponding recruitment strategy in this region was established. 【Results】 39.79% of respondents were 36~45 years old, 69.61% were males, 70.49% were non-local permanent residents, and 62.96% were with education background from junior high school to high school. Workers accounted for 36.57%, 400 mL-donation accounted for 56.87%, the percentage of blood type O reached 42.18%, and blood donors with 2~5 donations accounted for 70.27%. The proportion of blood donors from Songshan Lake area(23.46%) ranked the highest, and that from Shuixiang area the lowest (3.26%). 76.42% of donation recruitment were issued via SMS. 【Conclusion】 Blood donors 36~45 years old, with 2~5 donations, donated 400 mL blood, non-local registered male, ordinary employees with the education level of junior high school, technical secondary school or high school should firstly be considered. The targeted areas are the Songshan Lake area, the main urban area coastal areas and southeastern Dongguan near Shenzhen.The corresponding recruitment strategies should be adjusted based on needs and emergency level.

Pregnancy ; Female ; Humans ; Pregnancy Outcome ; Cross-Sectional Studies ; Lupus Erythematosus, Systemic/epidemiology* ; Pregnancy Complications/epidemiology* ; Menstruation Disturbances