In this paper, a method for dose calculation with pencil beam kernels constructed by point kernel superposition was proposed to accelerate the dose calculation during intensity optimization iteration. With this method, the direct aperture optimization method can be integrated in the planning system based on point kernel convolution/superposition model. The dose calculation time was also reduced during the iteration. From the result of the phantom and clinical patient data test, it was concluded that this method could be used for the intensity optimization of iteration dose calculation as the satisfied precision due to the optimization result coherence obtained. By implementing the method in the planning system product based on point kernel convolution/superposition model, a lot of additional research and development works for the pencil beam dose calculation model as well as the product maintenance cost can be avoided.
Algorithms ; Humans ; Models, Theoretical ; Phantoms, Imaging ; Radiotherapy Dosage ; Radiotherapy Planning, Computer-Assisted ; Software

This paper gives a general introduction of HIV/AIDS treatment with Traditional Chinese Medicine (TCM) in China during the past 20 years. Although the role of TCM in treatment of HIV/AIDS is promising, there is still a long way to go.

Objective To demonstrate the effect of bilateral adrenalectomy (ADX) on the susceptibility to NMDA-induced seizure and hippocampal CRH mRNA in young rats. Methods 60 Wistar rats at P10 were divided into control group, ADX group and Sham-ADX group. In the next day after operation, 7 mg/kg NMDA was injected to induce seizure, and incubation period (in minutes) as well as degree was evaluated. In situ hybridization was used to detect hippocampal CRH mRNA expression. Results Latency was (43.65 ± 2.96) minutes in control group, (35.05 ± 2.35)minutes in ADX group and (42.60 ± 1.90)minutes in Sham-ADX group. Latency in the ADX rats increased significantly (F = 73.73, P < 0.05). The seizure scale was (4.40 ± 0.60) in control group, (5.56 ± 0.76) in ADX group and (4.55 ± 0.76) in Sham-ADX group. The severity of seizures in ADX group increased significantly compared with the control and Sham-ADX groups (F = 15.52, P <0.05). CRH mRNA expression was 20% in control group, 55% in ADX group and 15% in Sham-ADX group. CRH mRNA in the ADX group was significantly elevated (χ2 = 9.048, P < 0.05). Conclusion Adrenalectomy exacerbates NMDA-induced spasm seizures in young rats , which might be related to CRH mRNA expression in the hippocampus.

Hippocampus is an important structure of neural memory circuit , which plays an important role in learning and memory integration in human and animal .Vision is the most important channel for people to accept information , while the vision system is the most common organ contacting information from outside .The retina as an important part of the visual system , plays a key role in human cognition of the objective world .The study found that many of pathological changes of the body will make the patients cognitive function decline , but molecular mechanism remains unclear .With the research on cognitive dysfunction was penetrated , the link be-tween how VEGF , PKC expression in hippocampus and retinal tissue and cognitive dysfunction was reviewed in this article .

OBJECTIVE To investigate the effective methods for nosocomial infection(NI) management and to adapt the new needs of quality-control in modern hospital.METHODS Under the circumstance to start using the ward building and reconstructing the outpatient building,by applying reasonable flow of work,making practicable rules and regulations,depending on new management mode of total cost-quality-effect and supervision-control-administration,to improve our NI management level in all directions in practice.RESULTS The reorganization towards NI management of all the staff had been boost,the rules and regulations of NI management had been carried out and NI had been controlled effectively.CONCLUSIONS Essential facilities are the matericl basis of NI management.Modernized management methods and process management are very meaningful to elevate the NI management level,and to ensure the quality of medical service.

Objective To explore the regulating mechanism of bcl 2 gene in hepatocyte injury caused by obstructive jaundice in rats. Methods Normal rats' and bile duct ligated 7d,14d,21d rats' hepatocytes were isolated by in situ collagenase perfusion and primary culture. (1) bcl 2 mRNA was detected by RT PCR in all cells; (2) After normal rat and bile duct ligated 14d rat hepatocytes were added 100?M GCDC and kept for 24hrs, cells were evaluated by FCM and TUNEL. Results (1) Normal rat hepatocytes did not express bcl 2 by RT PCR technique. bcl 2 was expressed in 7-,14-,21-day BDL rats. (2) After adding 100?M GCDC and keeping for 24hrs, the apoptosis of bile duct ligated rat hepatocytes significantly decreased compared with that of normal rat hepatocytes. Conclusions (1) Bile duct ligated rat hepatocytes expressed bcl 2. (2) Hepatocellular expression of bcl 2 during obstructive jaundice is an adaptive phenomenon to resist apoptosis by bile salts.

Objective: To evaluate dimensions of the nasopalatine canal and the relationship between the canal and the central incisors, and the canal and the crest, by using cone-beam computed tomography ( CBCT) . Methods:This study included 129 CBCTs, and the sagittal slices were used to measure the lower diameter ( Sda) , median diameter ( Sdb) , and higher diameter ( Sdc) , for calculating the average sagittal diameter ( Sd ); the coronal slices through canals were used to measure the lower diameter ( Hda) , median diameter ( Hdb ) , and higher diameter ( Hdc ) for calculating the average horizontal diameter ( Hd) , length ( H);the sagittal slices were used to measure the buccal bone thickness off the canal ( Bt) , and the distance to the crest off the lowest point ( At) , the horizontal slices were used to measure the distance between the canal and the central incisors ( Id) . These subjects were divided into two groups by gender;and divided into three groups by ages: (1) ≤30 years old, (2) 31 -50 years old, and (3) ≥51 years old. SPSS 17. 0 statistical software was used for statistical analysis. Results:The overall Sd was (3. 41 ± 0. 87) mm, the Hd was (5. 16 ± 0. 93) mm, and the difference was statisti-cally significant. The H was (14. 29 ± 3. 27) mm, the Bt was (7. 49 ± 1. 05) mm, the At was (8. 25 ± 1. 71) mm, and the Id was (2. 71 ± 0. 89) mm. Of the male and female, the Sd were (3. 64 ± 0. 90) mm and (3. 28 ± 0. 82) mm, P=0. 017; the Hd were (4. 98 ± 0. 89) mm and (5. 27 ± 0. 94) mm, P=0. 081;the H were (15. 47 ± 2. 75) mm and (13. 59 ± 3. 32) mm, P=0. 001;the Bt were (7. 90 ± 0. 96) mm and (7. 25 ± 1. 03) mm, P=0. 001; the At were (7. 41 ± 1. 86) mm and (8. 44 ± 1. 90) mm, P=0. 001; the Id were (2. 71 ± 0. 87) mm and (2. 72 ± 0. 91) mm, P =0. 983. Among the groups, no statistically significant differences were detected of the Sd (P =0. 325), of the Hd (P =0 . 636 ) , of the H ( P=0 . 292 ) , and of the Bt ( P=0 . 116 );statistically significant differences were de-tected of the At ( P=0 . 010 ) , and of the Id ( P<0 . 001 ) . Conclusion:The nasopalatine canal anatomy is highly variable. Gender is related to the nasopalatine canal length, Bt width, and At distance. While age was related to At, and Id, but no effect on nasopalatine dimensions. The CBCT is a useful device for studying the nasopalatine canal in three dimensions, prior to dental implant placement.

ObjectiveTo observe the clinical efficacy ofShu Feng An Shen(expelling wind and calming mind) needling plus distal points selection in treating cluster headache.MethodForty patients with cluster headache were divided into two groups by using random number table, 20 cases in each group. The treatment group was intervened byShu Feng An Shenneedling plus distal points selection, while the control group was by acupuncture with conventional points selection. The pain intensity score (Visual Analogue Scale, VAS), lasting duration and attack frequency were observed.ResultThe VAS score, lasting duration and attack frequency were significantly reduced after treatment in the two groups (P<0.01), and the reduction was more significant in the treatment group (P<0.01).ConclusionShu Feng An Shenneedling plus distal points selection can produce a more significant efficacy in reducing pain intensity, lasting duration, and attack frequency in treating cluster headache compared with acupuncture with conventional points selection.

Dietary management plays an important role in the diabetes mellitus therapies. Effective dietary management can find the deficit of dietary management in patients with diabetes mellitus. Recently these tools primarily were consisted in the comprehensive diabetes mellitus management instruments and a fraction of the ones aim at the evaluation of the dietary management for diabetes. Timely and effective assessment of the effect on diabetes diet management depends on these tools. Therefore, the feasibilities, usefulness and deficit about these instruments were analyzed to prompt the application and investigation of the instruments in the future.