ABSTRACT
To study the role of the activity in reducing the incidence of water leakage in digestive endoscopy, through the activity of the quality control circle (QCC), the reasons for water leakage and high maintenance cost are analyzed deeply. Then, the author formulated and implemented targeted measures to intervene in the non-standard aspects of daily management of endoscopy. Then targeted measures has been taken to improve the nonstandard daily management.Results demonstrate that the application of the quality control circle can significantly reduce the incidence of water leakage in the digestive endoscope and control the other faults caused by the leakage. This not only reduces the high maintenance cost of endoscopy, improves the utilization rate and turnover rate of endoscopy, but also fully explores personal potential, enhances team cohesion, and improves quality management awareness.
ABSTRACT
Objective To verify IMRT plans in point,planar and 3D dose,and to concretely analyze the dose differences of 3D anatomic structure based on Gamma passing rate.Methods Thimble ion-chamber,Matrixx and ArcCheck were separately used to measure six nasopharyngeal carcinoma treatment plans and six lung cancer treatment plans.The dose measurement deviation of the center point was compared as well as the Gamma passing rate of dose verification under the criteria of both 3％/3 mm and 2％/2 mm,the group t-test and one-way ANOVA were also proceeded.3DVH system was used to analyze the dose measurement deviation of target volume (TV) and organ at risk (OAR) through DVH.Results For IMRT and VMAT treatment plans,the mean deviation of point dose was (0.59 ± 1.31) ％ and (-1.00 ± 1.03)％ respectively,and the maximum deviation was less than 3％.Under the criterion of 3％/3 mm,the Gamma passing rate measured by Matrixx,ArcCheck and 3DVH for IMRT plans was 96.28％,97.55％ and 99.02％ respectively,and for VMAT plans,the corresponding results of three different detectors were 97.24％,99.67％ and 98.48％.The results analyzed and compared by 3DVH showed that even under the condition of high Gamma pass rate (more than 95％ for a Gamma criterion of 3％/3 mm),the DVH metrics of both TV and OAR in two cases (account for 16.7％ of the total plan) were significantly different on the clinical parameters,including GTV,spinal cord and brain stem etc.Conclusions The analysis of dose difference of the measurement results based on Gamma pass rate and on anatomic structure of 3D images can more effectively evaluate the influence of dose error to the implementing of clinical plan and the impact to the clinical treatment.