Objective: To prospectively evaluate the feasibility, accuracy, and safety of multiparameter MRI-guided percutaneous biopsy using a 1T open MRI scanner for evaluating suspicious centrally located lung lesions with associated post-obstructive atelectasis. Materials and Methods: In this single-center study, MRI-guided percutaneous coaxial cutting biopsy was performed for 107 suspicious central lung lesions with associated post-obstructive atelectasis in 107 patients between July 2015 and December 2020. A fast T2-weighted imaging (T2WI)-turbo spin echo (TSE) sequence and an enhanced fast T1-weighted imaging (T1WI)-TSE sequence were used to identify, localize, and biopsy lung lesions, and diffusion-weighted imaging (DWI) was used as a supplementary sequence for identifying the lesion location. The final diagnosis was confirmed by surgical histopathology or clinical follow-up for a minimum of 24 months. The sensitivity, specificity, and accuracy for diagnosing lung malignancies were calculated, and the complications were recorded for each case. Results: Using multiparameter MRI, central lung lesions could be clearly distinguished from post-obstructive atelectasis in 96 patients (89.7%). The sensitivity, specificity, and accuracy of MRI-guided percutaneous biopsy for diagnosing lung malignancy was 97.0% (98/101), 100% (6/6), and 97.2% (104/107), respectively. Self-limited hemoptysis occurred in three patients. Pneumothorax occurred in five patients, of which none required pleural drainage. No serious procedure-related complications were observed. Conclusion As a technology that does not involve ionizing radiation, multiparameter MRI-guided percutaneous coaxial cutting biopsy is a safe and accurate diagnostic technique for evaluating centrally located lung lesions associated with post-obstructive atelectasis.

Objective: To prospectively evaluate the feasibility, accuracy, and safety of multiparameter MRI-guided percutaneous biopsy using a 1T open MRI scanner for evaluating suspicious centrally located lung lesions with associated post-obstructive atelectasis. Materials and Methods: In this single-center study, MRI-guided percutaneous coaxial cutting biopsy was performed for 107 suspicious central lung lesions with associated post-obstructive atelectasis in 107 patients between July 2015 and December 2020. A fast T2-weighted imaging (T2WI)-turbo spin echo (TSE) sequence and an enhanced fast T1-weighted imaging (T1WI)-TSE sequence were used to identify, localize, and biopsy lung lesions, and diffusion-weighted imaging (DWI) was used as a supplementary sequence for identifying the lesion location. The final diagnosis was confirmed by surgical histopathology or clinical follow-up for a minimum of 24 months. The sensitivity, specificity, and accuracy for diagnosing lung malignancies were calculated, and the complications were recorded for each case. Results: Using multiparameter MRI, central lung lesions could be clearly distinguished from post-obstructive atelectasis in 96 patients (89.7%). The sensitivity, specificity, and accuracy of MRI-guided percutaneous biopsy for diagnosing lung malignancy was 97.0% (98/101), 100% (6/6), and 97.2% (104/107), respectively. Self-limited hemoptysis occurred in three patients. Pneumothorax occurred in five patients, of which none required pleural drainage. No serious procedure-related complications were observed. Conclusion As a technology that does not involve ionizing radiation, multiparameter MRI-guided percutaneous coaxial cutting biopsy is a safe and accurate diagnostic technique for evaluating centrally located lung lesions associated with post-obstructive atelectasis.

Objective: To prospectively evaluate the feasibility, accuracy, and safety of multiparameter MRI-guided percutaneous biopsy using a 1T open MRI scanner for evaluating suspicious centrally located lung lesions with associated post-obstructive atelectasis. Materials and Methods: In this single-center study, MRI-guided percutaneous coaxial cutting biopsy was performed for 107 suspicious central lung lesions with associated post-obstructive atelectasis in 107 patients between July 2015 and December 2020. A fast T2-weighted imaging (T2WI)-turbo spin echo (TSE) sequence and an enhanced fast T1-weighted imaging (T1WI)-TSE sequence were used to identify, localize, and biopsy lung lesions, and diffusion-weighted imaging (DWI) was used as a supplementary sequence for identifying the lesion location. The final diagnosis was confirmed by surgical histopathology or clinical follow-up for a minimum of 24 months. The sensitivity, specificity, and accuracy for diagnosing lung malignancies were calculated, and the complications were recorded for each case. Results: Using multiparameter MRI, central lung lesions could be clearly distinguished from post-obstructive atelectasis in 96 patients (89.7%). The sensitivity, specificity, and accuracy of MRI-guided percutaneous biopsy for diagnosing lung malignancy was 97.0% (98/101), 100% (6/6), and 97.2% (104/107), respectively. Self-limited hemoptysis occurred in three patients. Pneumothorax occurred in five patients, of which none required pleural drainage. No serious procedure-related complications were observed. Conclusion As a technology that does not involve ionizing radiation, multiparameter MRI-guided percutaneous coaxial cutting biopsy is a safe and accurate diagnostic technique for evaluating centrally located lung lesions associated with post-obstructive atelectasis.

Objective: To prospectively evaluate the feasibility, accuracy, and safety of multiparameter MRI-guided percutaneous biopsy using a 1T open MRI scanner for evaluating suspicious centrally located lung lesions with associated post-obstructive atelectasis. Materials and Methods: In this single-center study, MRI-guided percutaneous coaxial cutting biopsy was performed for 107 suspicious central lung lesions with associated post-obstructive atelectasis in 107 patients between July 2015 and December 2020. A fast T2-weighted imaging (T2WI)-turbo spin echo (TSE) sequence and an enhanced fast T1-weighted imaging (T1WI)-TSE sequence were used to identify, localize, and biopsy lung lesions, and diffusion-weighted imaging (DWI) was used as a supplementary sequence for identifying the lesion location. The final diagnosis was confirmed by surgical histopathology or clinical follow-up for a minimum of 24 months. The sensitivity, specificity, and accuracy for diagnosing lung malignancies were calculated, and the complications were recorded for each case. Results: Using multiparameter MRI, central lung lesions could be clearly distinguished from post-obstructive atelectasis in 96 patients (89.7%). The sensitivity, specificity, and accuracy of MRI-guided percutaneous biopsy for diagnosing lung malignancy was 97.0% (98/101), 100% (6/6), and 97.2% (104/107), respectively. Self-limited hemoptysis occurred in three patients. Pneumothorax occurred in five patients, of which none required pleural drainage. No serious procedure-related complications were observed. Conclusion As a technology that does not involve ionizing radiation, multiparameter MRI-guided percutaneous coaxial cutting biopsy is a safe and accurate diagnostic technique for evaluating centrally located lung lesions associated with post-obstructive atelectasis.

Objective: To prospectively evaluate the feasibility, accuracy, and safety of multiparameter MRI-guided percutaneous biopsy using a 1T open MRI scanner for evaluating suspicious centrally located lung lesions with associated post-obstructive atelectasis. Materials and Methods: In this single-center study, MRI-guided percutaneous coaxial cutting biopsy was performed for 107 suspicious central lung lesions with associated post-obstructive atelectasis in 107 patients between July 2015 and December 2020. A fast T2-weighted imaging (T2WI)-turbo spin echo (TSE) sequence and an enhanced fast T1-weighted imaging (T1WI)-TSE sequence were used to identify, localize, and biopsy lung lesions, and diffusion-weighted imaging (DWI) was used as a supplementary sequence for identifying the lesion location. The final diagnosis was confirmed by surgical histopathology or clinical follow-up for a minimum of 24 months. The sensitivity, specificity, and accuracy for diagnosing lung malignancies were calculated, and the complications were recorded for each case. Results: Using multiparameter MRI, central lung lesions could be clearly distinguished from post-obstructive atelectasis in 96 patients (89.7%). The sensitivity, specificity, and accuracy of MRI-guided percutaneous biopsy for diagnosing lung malignancy was 97.0% (98/101), 100% (6/6), and 97.2% (104/107), respectively. Self-limited hemoptysis occurred in three patients. Pneumothorax occurred in five patients, of which none required pleural drainage. No serious procedure-related complications were observed. Conclusion As a technology that does not involve ionizing radiation, multiparameter MRI-guided percutaneous coaxial cutting biopsy is a safe and accurate diagnostic technique for evaluating centrally located lung lesions associated with post-obstructive atelectasis.

Abstract In order to promote the high quality development of school meals, the article systematically analyzes the Policy Report on Promoting Healthy Meals in Schools issued by World Health Organization (WHO), introduces ways of changing the physical environment of meals and adjusting the provision of dietary information, clarifies the five steps of basic research-goals setting-action plans-implementation-impact evaluation, and points out that the development of school meals in China is facing the realistic difficulties such as unreasonable school nutrition structure, unbalanced nutrition supply, low nutritional awareness of students and serious double malnutrition burden. The paper puts forward the enlightenment of reasonable use of nudge to help students develop scientific eating habits, strengthen school health education, and reduce students double burden of malnutrition.

OBJECTIVE:To systematically assess the effect of blood flow restriction combined with endurance training on aerobic capacity,lower limb muscle strength,and sports performance of athletes using Meta-analysis. METHODS:3210 studies were searched in CNKI,VIP,WanFang,PubMed,Embase,Web of Science,ScienceDirect,and Cochrane databases before March 2023.After screening,12 studies and 14 research reports were included.The traditional Meta-analysis and network Meta-analysis were performed by Review Manager 5.4 and Stata 14. RESULTS:Endurance training with blood flow restriction had a medium effect size on maximal oxygen uptake(standardized mean difference(SMD)=0.59,95%confidence interval(CI):0.28-0.90,P＜0.05)and no heterogeneity.The effect of continuous pressure was better than the other pressure types(P＜0.05).Compared with sports events by anaerobic energy supply,sports events by aerobic energy supply showed better effects(P＜0.05),which was set as follows:4-8 weeks of aerobic training,20-30 minutes once,3 or more sessions per week,for a total of 12 or more sessions.Secondly,endurance training with blood flow restriction showed a large effect on the lower limb muscle strength(SMD=0.99,95%CI:0.61-1.37,P＜0.05)and no heterogeneity.A subgroup analysis showed muscle endurance was the best improved(SMD=1.11;95%CI:0.37-1.85),followed by knee extension strength(SMD=1.02,95%CI:0.37-1.67)and knee flexion strength(SMD=0.87,95%CI:0.24-1.51).Finally,endurance training with blood flow restriction showed a medium effect on sports performance(SMD=0.59,95%CI:0.13-1.06,P＜0.05),and the subgroup analysis showed a medium effect on running performance(SMD=0.55,95%CI:0.05-1.06,P＜0.05)and no heterogeneity.There was only one item of soccer specific performance that was not analyzed. CONCLUSION:Endurance training combined with blood flow restriction can improve the aerobic capacity,lower limb muscle strength,and sports performance of the athletes.And there is a large effect on lower limb muscle strength and a medium effect on aerobic capacity and sports performance.A training schedule of progressive mixed-intensity aerobic endurance training under continuous pressure for no less than 4 weeks,3 sessions per week,20-30 minutes per session,for 12 or more sessions in total is easy to obtain better training results.

Objective:To design a single-line low-temperature plasma ablation electrode, aiming to solve the problem of uniform, continuous and stable microbubbles generated by conventional electrodes, and improve the ablation and cutting effect of low-temperature plasma.Methods:The structures of low temperature plasma three-wire electrode and single-line electrode were modeled in SolidWorks 2021 3D modeling software, and the prototype was made by 3D printing. The finite element analysis of electric field and temperature field of the two kinds of electrode ablation process was carried out by COMSOL Multiphysics 6.1 software, and the validity and correctness of the finite element simulation model were verified by temperature test experiment, and the ablation effect and plasma excitation process of the two kinds of electrode were compared by tissue ablation experiment and low temperature plasma excitation experiment.Results:The results of finite element analysis showed that the maximum surface temperature of three-wire electrode and single-wire electrode were 70.2 and 63.3 ℃, respectively, and the surface temperature of single-wire electrode was more ideal, and the maximum electric field intensity of the two electrodes was more than 1.0 × 10 7 V/m, which met the electric field condition of microbubble breakdown. The electric field intensity of the two ends of the three-wire electrode was much higher than that of the other regions, while the electric field intensity of the single-wire electrode had no obvious sudden change and fluctuation. The experimental values of the temperature at the electrode surface and a distance of 1 cm on the electrode surface were basically consistent with the simulation values, the degree of fit was good, and the relative error was 3.2%. The highest ablation temperature of single linear electrode on pig fat was 46.8 ℃. After ablation, there was no coking area in morphology, and the tissue cutting depth of 0.5 mm could be reached in 1 s. When connected to the energy platform, microbubbles would occur on the working electrode surface of the single-wire electrode; when 6 ms was electrified, the working electrode surface was completely covered by microbubbles; when 9 ms was energized, the low-temperature plasma was excited and the blue-purple plasma could be seen; when 25 ms was energized, the microbubbles were still regular and stable. Conclusions:A kind of single-line low-temperature plasma ablation electrode is designed, which can produce uniform, continuous and stable microbubbles and achieve better ablation and cutting effect than the traditional electrode.

Objective To improve the efficiency and quality of end-to-end anastomosis,a novel degradable vascular anastomotic device was designed,and the relationship between pressure distances and biomechanical properties of the anastomotic stoma was explored.Methods The three-dimensional(3D)structure of the vascular anastomotic device was designed and the prototype was fabricated with extruded high-purity magnesium.The finite element model of the end-to-end vascular anastomosis was established to study the stress distributions of the anastomotic end face under different pressure distances(0.4,0.5,0.6,0.7,and 0.8 mm)and their change rules.In vitro experiments were conducted to verify the rationality of the finite element results as well as the feasibility and effectiveness of the vascular anastomotic device.Results When the pressure distance was 0.6 mm,the anastomotic tensile force,and burst pressure could reach(11.79±0.64)N and(39.32±2.99)kPa,respectively,meeting the clinical requirement for the strength of vascular anastomosis,and with the minimal mechanical damages to tissues.Conclusions The device designed in this study can be used for vascular anastomosis by adjusting the pressure distance,and it can improve operation efficiency,reduce mechanical damage to tissues,and further improve the quality of anastomosis.These results provide an essential reference for the design of degradable vascular anastomotic devices.

Scoliosis is a common deformity in neuromuscular disease, which usually has the characteristics of early onset age, severe degree of deformity, and rapid progression.Neuromuscular scoliosis often leads to serious damages to the quality of life, and results in the loss of walking, standing and sitting, and cardiopulmonary insufficiency.Surgical treatment can improve the quality of life for children with neuromuscular scoliosis, but surgical treatment is still challenging due to the complex surgery and many complicated diseases.The complications are much higher than those of idiopathic scoliosis.A multidisciplinary team is necessary in the surgical treatment of neuromuscular scoliosis to promptly and effectively reduce the complications.