Medical laser adopts optical fibers as spread media, using laser energy for the purpose of diagnostics and therapeutics. The corresponding industry standard is YY/T 0758-2009 General requirements for therapeutic laser fiber, which requires manufacturers to offer applicable wave length (or spectrum range) of the fiber, and the corresponding minimum transmission efficiency of the wave length. This research focuses on the matching of therapeutic laser fiber and laser source, to support and emphasize the importance and reasonability of relative requirements in YY/T 0758-2009.
Equipment Design ; Lasers ; Optical Fibers

With the development of medical radiography, cone beam computed tomography (CBCT) has been widely used in stomatology because of its numerous advantages, such as adequate spatial resolution, low radiation, undistorted three- dimensional tissue information, and good applicability for hard tissue imaging. Traditional periapical radiography is based on two-dimensional image which displays the three-dimensional object and its surrounding structures. Periapical radiography can only show the overlapping mesio-distally direction bone destruction, can't show buccolingual direction bone destruction. As a kind of three-dimensional imaging technology, CBCT can show three-dimensional structure of the organization from sagittal, coronal and axial direction, to overcome the defect of two-dimensional image such as overlap and deformation. CBCT has a unique advantage than periapical radiography in the diagnosis and treatment for periapical disease. This review will summarize the difference between CBCT and periapical radiography in the periapical disease.
Cone-Beam Computed Tomography ; Humans ; Imaging, Three-Dimensional ; Periapical Diseases ; diagnostic imaging ; Radiography, Bitewing

Child ; Humans ; Urolithiasis ; diagnosis ; therapy

Objective To study the clinical effect of iodine-131 treatment of hyperthyroidism.Methods 92 hyperthyroidism patients were selected,who were randomly divided into the observation group and control group, with each 46 cases.The observation group was given radioactive iodine-131 treatment,the control group was given anti thyroid function of drug treatment.The efficacy and adverse drug reaction of the occurrence of long-term and short-term in the two groups were compared.Results In the observation group,the cure rate and total effective rate were respec-tively 93.48% and 100.00%,which were significantly higher than the control group for 63.04% and 84.78%(χ2 =12.55,7.57,all P <0.05).The incidence of adverse reaction in the observation group was 4.35%,which was significantly lower than 21.74% in the control group (χ2 =6.13,P <0.05).The recurrence and complication(hypothyroidism)cases in the observation group,were 1 cases and 8 cases,while the control group were 10 cases and 1 cases.The relapse rate of the observation group was significantly lower than that of the control group,and the incidence of compli-cations was significantly higher than the control group,the difference was statistically significant(χ2 =8.36,6.03,all P <0.05 ).Conclusion The iodine short-term efficacy of-131 in treatment of hyperthyroidism can significantly improve the treatment of the disease,and has high safety,but the complication rate is higher than that of anti thyroid drugs.

Objective: To study the effect of ?- carotene(?-C) on lipid peroxidation and RBC-membrane fluidity of rats inflicted with alloxan. Methods: Forty-four 2mo-old Wistar rats were randomly divided into 4 groups and fed with basal diet (group A and B), basal diet + vitamin E (200 mg/kg) (C) and basal diet+? carotene (200 mg/kg) (D) for 4 w respectively. Then, alloxon (3%) was injected intraperitoneally except group A, which was injected with normal saline. After 48 h the rats were killed and a series of indices were examined. Results: After injected with alloxan, Na +,K +-ATPase and GSH-Px activity, RBC-membrane fluidity in rats fed with diets C,D were markedly increased while MDA levels were decreased. Conclusion: ?-C and V E can decrease lipid peroxidation and increase the stability of RBC-membrane in rats inflicted with alloxan.

AIM: To establish the influenza infected mouse model and study the anti-inflammatory effect of ganmao shuangjie heji. METHODS: IV FM1 infected mice were used as the animal model. The changes of pathology and the cytokine TNF-?, IFN-? and IL-10 in the lung were observed by HE staining and ELISA (double antibody sandwich enzyme linked immunosorbent assay) after ganmao shuangjie heji treatment. RESULTS: After infected by influenza virus, severe interstitial pneumonia was induced in the model group. Mild interstitial pneumonia was observed in ganmao shuangjie heji treated group. The protein expressions of cytokine TNF-?, IFN-? and IL-10 were higher in model group than those in the control group. The protein expressions of TNF-? and IFN-? in ganmao shuangjie heji treated group decreased and IL-10 expression increased significantly compared with model group. CONCLUSION: Ganmao shuangjie heji decreases the expressions of TNF-? and IFN-?, and increases the expression of IL-10, thus, alleviates inflammatory injury. The clinical application of this medicine can shorten the course of disease.

Conventional aorto-iliac surgery has the disadvantages of major surgical trauma, more complications, long hospital stay and postoperative recovery. Although endovascular surgery is a minimally invasive surgical technology, but it is not suitable for all patients and long-term outcomes are still uncertain. Laparoscopic aorto-iliac surgery affords advantages of minimally invasive surgical techniques and certain long-term outcomes, it is now becoming a third way to treat patients with aorto-iliac diseases.

Based on the description of styles and characteristics of fume hoods in modern laboratories, this paper analyzes the control strategies in fume hoods and ventilation systems and discusses the control and application of VAV as well as its advantages on safety, energy conservation and comfort.

Objective To preliminarily compare accuracy of magnetic resonance elastography (MRE) and T2WI in assessing stiffness of tissue.Methods Agar gel phantoms of 23 different concentrations ranging from 0.8％-3.0％ were produced.All the phantoms were examined with MRE and T2 map scanning respectively.After the raw images were processed by using local wavelength estimation (LEF),shear modulus of scan slice was measured,and T2 value of the same slice was measured with GE ADW4.3 workstation.Pearson correlation analysis was used to test the correlation between shear modulus and agar concentration,as well as T2 value and concentration.Rank sum test was used to compare the correlation coefficients of them.Results All the shear modulus and T2 values of the phantoms were successfully obtained,which were (49.1 ± 23.5) kPa and (57.8 ± 21.8) ms respectively.Shear modulus was positively correlated with concentration of agar gel(r1 =0.985,r1 2 =0.970,P ＜ 0.01),while T2 value was negatively correlated with concentration of agar gel (r2 =-0.901,r22 =0.812,P ＜ 0.01).The differences of these two correlation coefficients were statistically significant (Z =5.459,P ＜ 0.01).Conclusion MRE is more accurate to reflect stiffness of tissues relative to T2WI,and shows great clinical prospect.

Gastrointestinal Tract ; microbiology ; Humans ; Metagenome ; Microbiota ; Non-alcoholic Fatty Liver Disease ; microbiology