Objective To test the accuracy of a three-dimensional dose verification system CompassR,which reconstructing dose distribution based on measurements and independent dose calculation,and to evaluate the feasibility of its application in clinical intensity-modulated radiotherapy (IMRT) quality assure.Methods A set of square-wave chart patterns of 2 cm,1 cm and 0.5 cm gaps was designed and 11 completed IMRT lung plans were selected for the test.EDR2 film and the ionization chamber were used for test and verifying of plane dose distribution and some special points dose of CompassR.The IMRT phantom plans were verified by CompassR with three-dimension based on anatomical information.Parameters including the volume γ pass rate and the average dose deviation were tested using dose volume histograms.Results In square-wave chart patterns test,the dose distribution reconstructed and calculated by CompassR coincided with the measurement using film.The γ pass rates (3％/3 mm,2％/2 mm) exceeded 90％.When the width of field is 0.5 cm,the γ pass rate was a little lower on account of the penumbra zone.Compared to the dose distribution profile which was measured by film,the maximum deviations of the dose distribution profile which was reconstructed and calculated by CompassR were 3.21％ and 2.70％.The absolute dose deviation of specific point in the IMRT plans was less than 3％,the maximum deviation occurred in the lung.Compared to film,the averageγpass rates on the isocenter plain in IMRT plan were (94.65 + 1.93)％ (3％/3 mm) which was reconstructed by CompassR.In three-dimensional dose verification,the volume γ pass rates of targets and risk organs were not less than 90％,and the deviation of average dose was less than 1％.Conclusions Accuracy of the tested system satisfies the demand of IMRT dose verification.CompassR could provide information of volumetric dosimetry and anatomical location of dose error,which is benefit for evaluating the clinical value of verification result.

Objective:To establish the determination method for four lurasidone hydrochloride enantiomers by HPLC. Methods:Lurasidone hydrochloride enantiomers were separated on a CHIRALPAK AD-H column (250 mm × 4. 6 mm, 5μm). The mobile phase consisted of hexane-ethanol-diethylamine ( 90∶10∶0. 1) at a flow rate of 1. 0 ml·min-1 and the column temperature was at 40℃. The detection wavelength was 230nm. Results:The resolution of lurasidone hydrochloride enantiomers was above 2. 0. The linear calibra-tion curves were obtained over the range of 5-120 μg· ml-1 for all the enantiomers (r=0. 999 9). The recovery was above 99. 0%with RSD below 0. 5%. The detection limits were 5ng. Conclusion:The method is simple, accurate and rapid, and suitable for the de-termination and quality control.

Objective:To determine the relationship between serum resistin levels and carotid intima media(IMT)thickness in patients with essential hypertension. Methods:This study consisted of 272 patients with essential hypertension. The patients were divided into three groups according to their serum resistin levels. Group 1,n=91,serum resistin level 1.233-3.701 ng/ml;Group 2,n=91,serum resistin level 3.728-8.777 ng/ml;and Group 3,n=90,serum resistin level 8.809-28.658 ng/ml. Results:The carotid IMT and maximum carotid IMT of Group 3 were the highest in three groups.(P＜0.05).As shown in multivariate analysis for factors affecting carotid IMT,serum resistin level(β=0.220,t=5.793,P=0.000)was independently associated with the carotid IMT after controlling the age,blood glucose,uric acid,low-density lipoprotein cholesterol,systolic blood pressure and diastolic blood pressure. Serum resistin level(β=0.189,t=4.733,P=0.000)was independently associated with the maximum carotid IMT after controlling the age,blood glucose,body mass index,diastolic blood pressure,diabetes mellitus,high sensitivity C reactive protein,total cholesterol and triglyceride. Conclusion:Serum resistin was independently associated with the increased carotid IMT in essential hypertension patients.

BACKGROUND:Previous study has confirmed that seasonal variation and surfactant associated protein A(SP-A)and interleukin-6(IL-6)exhibit a significant role in lung immune and defense function.However,the effect mechanism of them remains unclear.OBJECTIVE:By observing the changes of SP-A and IL-6 of male rats in autumn and winter.to explore the effects of seasonal changes on the nonspecific immunity of lung of normal rats,and to provide new ideas for the experimental basis to the cognition of pathology and physiology mechanism for seasonal attack of respiratory system diseases.METHODS:Male SD rats were purchased from each seasons and divided into groups in chronological order All rats were housed with normal forage and drank freely under room temperature.Then the rats were sacrificed by decapitation before 18 o'clock at corresponding solar term and the lung tissues were analyzed by RT-PCR.RESULTS AND CONCLUSION:Compared to the other groups.the expression of SP-A and IL-6 in the Winter Begins group were smaller.which demonstrated that immune function of lung was existed the seasonaI rhythm of lower in winter and higher in autumn.The SP-A and IL-6 are main material basis of immune function.

Objective To establish the quality standard for Sanyuan Rupixiao Gel Paste. Methods Sparganii Rhizoma, Gleditsiae Sinensis Fructus, Cyperi Rhizoma and Impatientis Semen were identified by TLC method. The content of tetrahydropalmatine was determined by HPLC. Waters symmetry column was used with the mobile phase of acetonitrile-0.1% phosphatic acid in a gradient manner (pH was adjusted to 6.4 by triethylamine) (55:45) at the detection wavelength of 280 nm. The flow rate was 1.0 mL/min at the column temperature of 30 ℃. Results The spots in TLC were clear without any interference;tetrahydropalmatine showed a good linear relation in the range of 0.092–1.84 μg;the average recovery was 100.15%with RSD of 1.58%(n=6). Conclusion The method is simple and accurate with high reproducibility, which can be used for the quality control of Sanyuan Rupixiao Gel Paste.

Objective:To evaluate correlation between left ventricular mechanical contraction synchrony and left ventricular systolic function by gated myocardial perfusion imaging(GMPI) using Cadmium-Zine-Telluride (CZT) SPECT.Methods:Three hundred and forty three consecutive patients( 232 males, 111 females, age (60.08±12.88) years) who underwent CZT SPECT GMPI in Shanxi Cardiovascular Hospital between January and August 2019 were retrospectively analyzed. The Emory cardiac toolbox was used to process the imaging data, and the left ventricular systolic synchrony parameters and systolic function parameters were acquired, including peak phase(PP), phase standard deviation (PSD), phase histogram bandwidth(PHB), histogram skewness(HS), histogram kurtosis(HK), and end-diastolic volume( EDV), end-systolic volume (ESV), left ventrieular ejection fraction (LVEF). All patients were divided into 4 groups: the normal group (147 cases), ischemic cardiomyopathy group (114 cases), nonischemic cardiomyopathy without left bundle branch block (LBBB) group(50 cases)and nonischemic cardiomyopathy with LBBB group(32 cases). The relationship between systolic synchrony parameters and systolic function parameters were analyzed with Pearson correlation analysis.Results:Statistic results for all patients showed that PSD and PHB were well correlated with LVEF( r values: -0.790, -0.799, both P<0.01), but PP was poorly correlated with LVEF( r=-0.194, P<0.01); HS, HK were positively correlated with LVEF( r values: 0.767, 0.676, both P<0.01); PSD, PHB were positively correlated with ESV( r values: 0.778, 0.795, both P<0.01) and EDV ( r values: 0.722, 0.732, both P<0.01); but PP was poorly correlated with ESV( r=0.145, P<0.01) and not correlated with EDV ( r=0.095, P>0.01). HS, HK were negatively correlated with EDV and ESV ( r values: -0.700 to -0.580, all P<0.01). PSD and PHB showed negatively correlation with LVEF ( r values: -0.834 to -0.492, all P<0.01), while HS, HK showed positive correlation with LVEF ( r values: 0.243-0.792, all P<0.01) in normal group, the ischemic cardiomyopathy group, the nonischemic cardiomyopathy without LBBB group and the nonischemic cardiomyopathy with LBBB group. Conclusions:The left ventricular systolic synchrony parameters provided by CZT SPECT GMPI correlate well with the left ventricular systolic function parameters, and the worse systolic function, the worse systolic synchrony. Both ischemic cardiomyopathy and non-ischemic cardiomyopathy can affect left ventricular mechanical contraction synchrony, and the effect on contraction synchrony in non-ischemic cardiomyopathy patients with LBBB is greater.

Oral diseases concern almost every individual and are a serious health risk to the popula-tion.The restorative treatment of tooth and jaw defects is an important means to achieve oral function and support the appearance of the contour.Based on the principle of"learning from the nature",Deng Xu-liang's group of Peking University School and Hospital of Stomatology has proposed a new concept of"microstructural biomimetic design and tissue adaptation of tooth/jaw materials"to address the worldwide problems of difficulty in treating dentine hypersensitivity,poor prognosis of restoration of tooth defects,and vertical bone augmentation of alveolar bone after tooth loss.The group has broken through the bottle-neck of multi-stage biomimetic technology from the design of microscopic features to the enhancement of macroscopic effects,and invented key technologies such as crystalline/amorphous multi-level assembly,ion-transportation blocking,and multi-physical properties of the micro-environment reconstruction,etc.The group also pioneered the cationic-hydrogel desensitizer,digital stump and core integrated restora-tions,and developed new crown and bridge restorative materials,gradient functionalisation guided tissue regeneration membrane,and electrically responsive alveolar bone augmentation restorative membranes,etc.These products have established new clinical strategies for tooth/jaw defect repair and achieved inno-vative results.In conclusion,the research results of our group have strongly supported the theoretical im-provement of stomatology,developed the technical system of oral hard tissue restoration,innovated the clinical treatment strategy,and led the progress of the stomatology industry.