In proton therapy,prompt gamma-ray imaging is considered as one of the most promising methods for assessing proton beam range.Prompt gamma-ray imaging detector evaluates the proton beam range based on the prompt gamma-ray distribution obtained by the prompt gamma-ray imaging system,which enables high-precision measurement of the proton beam range.Herein a proton beam range verification algorithm is designed for the newly developed prototype of the range verification detector(pixelated prompt gamma-ray imaging detector),which verifies the range estimation accuracy of the prototype for different phantoms and different energies of homogeneous media through Monte Carlo simulation.The results show that the accuracy of the proton beam range verification algorithm is within 0.5 mm of the safety margin error of the Bragg peak,and the measurement accuracy is significantly improved with the increase of the number of protons,indicating that the prototype algorithm is feasible for proton beam range verification.

In proton therapy,prompt gamma-ray imaging is considered as one of the most promising methods for assessing proton beam range.Prompt gamma-ray imaging detector evaluates the proton beam range based on the prompt gamma-ray distribution obtained by the prompt gamma-ray imaging system,which enables high-precision measurement of the proton beam range.Herein a proton beam range verification algorithm is designed for the newly developed prototype of the range verification detector(pixelated prompt gamma-ray imaging detector),which verifies the range estimation accuracy of the prototype for different phantoms and different energies of homogeneous media through Monte Carlo simulation.The results show that the accuracy of the proton beam range verification algorithm is within 0.5 mm of the safety margin error of the Bragg peak,and the measurement accuracy is significantly improved with the increase of the number of protons,indicating that the prototype algorithm is feasible for proton beam range verification.

Objective To explore the causes of medical safety adverse events in our hospital in order to improve the hospital's medical safety and quality. Methods The medical safety adverse events occurred in our hospital from 2013 to 2014 were retrospectively analyzed, focusing on the analysis of the department, type and severity of adverse events. Results Medical safety adverse events mainly occurred in surgery. The main types of medical safety incidents were drug incidents, and the severity was mostly reported by Class Ⅱ incidents (adverse event events). Conclusion By analyzing the causes of adverse medical safety incidents, relevant medical safety management measures are formulated to timely contain medical safety adverse events.

OBJECTIVETo evaluate the efficacy and necessity of retained rectal posterior mucosa in procedure for prolapse and hemorrhoids (PPH).

METHODSClinical data of 260 cases with severe hemorrhoids in our hospital from January 2010 to May 2012 were analyzed retrospectively. A total of 132 cases with severe hemorrhoids excluding in rectal posterior wall were enrolled in retained rectal posterior mucosa in PPH (improvement group), other 128 cases of severe hemorrhoids were assigned to PPH (conventional group). Operative parameters, efficacy and complication after operation were compared.

RESULTSTwo groups of patients received successful operations. Postoperative pain duration, frequency of analgesic drugs and postoperative hospital stay in improvement group were significantly reduced [(1.3 ± 0.5) d vs. (4.8 ± 0.7) d, 1.1 ± 0.3 vs. 5.9 ± 0.6, (5.2 ± 0.8) d vs. (5.8 ± 0.5) d, all P<0.01]. Incidence of anastomotic stenosis, heavy feeling in the anus and delayed bleeding in improvement group were significantly lower than those in conventional group (0 vs. 7.8%, 0.8% vs. 14.1%, 0 vs.7.8%, all P<0.01).

CONCLUSIONSThe application of retained rectal posterior mucosa in PPH to patients with severe hemorrhoids excluding in rectal posterior wall can significantly reduce postoperative complications. But long-term efficacy needs further observation.

Constriction, Pathologic ; Hemorrhoids ; epidemiology ; surgery ; Humans ; Incidence ; Mucous Membrane ; Pain, Postoperative ; Postoperative Complications ; Postoperative Period ; Prolapse ; Retrospective Studies

Objective To evaluate the efficacy and necessity of retained rectal posterior mucosa in procedure for prolapse and hemorrhoids (PPH). Methods Clinical data of 260 cases with severe hemorrhoids in our hospital from January 2010 to May 2012 were analyzed retrospectively. A total of 132 cases with severe hemorrhoids excluding in rectal posterior wall were enrolled in retained rectal posterior mucosa in PPH (improvement group), other 128 cases of severe hemorrhoids were assigned to PPH (conventional group). Operative parameters, efficacy and complication after operation were compared. Results Two groups of patients received successful operations. Postoperative pain duration , frequency of analgesic drugs and postoperative hospital stay in improvement group were significantly reduced [(1.3±0.5) d vs. (4.8±0.7) d, 1.1±0.3 vs. 5.9±0.6, (5.2±0.8) d vs. (5.8±0.5) d, all P<0.01]. Incidence of anastomotic stenosis, heavy feeling in the anus and delayed bleeding in improvement group were significantly lower than those in conventional group (0 vs. 7.8%, 0.8% vs. 14.1%, 0 vs.7.8%, all P<0.01). Conclusions The application of retained rectal posterior mucosa in PPH to patients with severe hemorrhoids excluding in rectal posterior wall can significantly reduce postoperative complications. But long-term efficacy needs further observation.

Objective To evaluate the efficacy and necessity of retained rectal posterior mucosa in procedure for prolapse and hemorrhoids (PPH). Methods Clinical data of 260 cases with severe hemorrhoids in our hospital from January 2010 to May 2012 were analyzed retrospectively. A total of 132 cases with severe hemorrhoids excluding in rectal posterior wall were enrolled in retained rectal posterior mucosa in PPH (improvement group), other 128 cases of severe hemorrhoids were assigned to PPH (conventional group). Operative parameters, efficacy and complication after operation were compared. Results Two groups of patients received successful operations. Postoperative pain duration , frequency of analgesic drugs and postoperative hospital stay in improvement group were significantly reduced [(1.3±0.5) d vs. (4.8±0.7) d, 1.1±0.3 vs. 5.9±0.6, (5.2±0.8) d vs. (5.8±0.5) d, all P<0.01]. Incidence of anastomotic stenosis, heavy feeling in the anus and delayed bleeding in improvement group were significantly lower than those in conventional group (0 vs. 7.8%, 0.8% vs. 14.1%, 0 vs.7.8%, all P<0.01). Conclusions The application of retained rectal posterior mucosa in PPH to patients with severe hemorrhoids excluding in rectal posterior wall can significantly reduce postoperative complications. But long-term efficacy needs further observation.

Objective To investigate the prevalence of hyperuricemia (HUA) in the elderly in Tanggu Community of Tianjin,and to analyze the related factors.Methods The elderly inhabitants from one community of Tanggu in Tianjin were randomly selected and their serum uric acid (SUA)levels and metabolic syndrome (MS)-related indexes were examined.There were 622 subjects with complete data (260 men,362 women; mean age 67.4 ± 6.0 years).Results The standardized prevalence of HUA in the elderly in this community was 9.1％ in total,and 7.6％ in males,10.6％ in females,and there was no significant difference between males and females (P=0.281).The levels of SUA were (283.37 ± 78.69) μmol/L in total,(315.80 ± 74.39) μmol/L in males and (260.00 ±73.31) μmol/L in females,and the SUA level was higher in males than in females (P＜0.001).The levels of blood urea,creatinine (Cr),triglyceride (TG),body mass index (BMI) were higher in patients with HUA than in patients with normal serum uric acid (P=0.000,0.000,0.002,0.049respectively).The multiple factors regression analysis showed that the SUA level was positively correlated with the levels of blood urea,Cr,TG,low density lipoprotein cholesterol (LDL-C) (P=0.000,0.017,0.000,0.019) and was negatively correlated with the levels of high density lipoprotein cholesterol (HDL-C) and fasting blood glucose (P=0.000,0.001).Conclusions The prevalence of HUA in the elderly is lower in Tanggu Community of Tianjin than in other cities in China.The SUA level of the elderly is significant higher in males than in females.The lower kidney function,hypertriglyceridemia and higher LDL-C are the risk factors for HUA,while elevated HDL-C and fasting blood glucose are associated with the decreased SUA level.

Objective To investigate the prevalence of metabolic syndrome (MS) and its components among the elderly at Tanggu community in Tainjin. Methods The elderly inhabitants were drawn out randomly from one community at Tanggu in Tianjin to examine the MS-related indexes. There were 623 samples with complete data aged (67.4±6.0) years, including 261 males with mean age of (68.3±6.1) years and 362 females with mean age of (66.9±6.0) years. Diagnosis of MS was done by criteria of Chinese Medical Association Diabetes Branch in 2004. Results The standardized prevalence of MS for the elderly in the community was 18.5% with the highest risk group aged 60～69 years. Standardized prevalences of hypertension, high triglycerides, high blood sugar, overweight, obesity, low HDL-C were 49.5%, 38.8%, 25.3%, 42.0%, 4.2%, 3.0% in the elderly. Conclusions The prevalence of MS in the elderly is lower in Tanggu community in Tianjin than in Shanghai, Foshan in Guangdong, Qingdao in Shandong and Beijing city. The condition in female is more severe than in male, the highest prevalence occurs in hypertension, and overweight, high triglycerides and high blood sugar follow it, but few of them are obesity, low HDL-C is fewer too.

Objective To evaluate the value of L-(methyl-11C)-labeled methionine positron emissions tomography (MET PET) and MRI in target volume delineation for postoperative radiotherapy for brain high grade glioma (HGG).Methods Thirty-seven patients with supratentorial HGG were included.Both MRI and MET PET scan were performed in the same treatment position for all patients.The consistency to determine residual tumor between MRI and MET PET was analyzed.Imaging data of MET PET and MRI were coregistered using the BrainLAB image fusion software.The extension of the volume with high uptake (VMET) on MET PET were compared quantitately with the enhancing area on MRI T1W gadolinium enhancement (VGd) and the hyperintensity area on MRI T2W (VT2).Results Both MET PET and MRI were positive for 19 patients and negative for 7 patients.The consistency between these two scans was 70.3%.MET PET was integrated with MRI in 30 patients with positive MET uptake.VMET were partially or entirely outside VGd in 29 patients and VT2 in 17 patients, whereas VGd and VT2 were partially or entirely outside VMET in all patients.The maximal distance from the margin of VMET to VGd was ≥ 2.0 cm in 50%patients and the corresponding distance of VMET to VT2 was ≥ 1.0 cm in 33% patients.Conclusions The differences are existing between MET PET and MRI in determination and identification of the location and extension of residual tumor for patients with HGG.The integration of MET PET and MRI can accurately delineate radiation target volume.