The design of sleeve detach and reunion drive device of screw melt ex- truder equipment was optimized, based on the present installation of hygraulic drive device to achieve the mechanical opening and closing of the s...The design of sleeve detach and reunion drive device of screw melt ex- truder equipment was optimized, based on the present installation of hygraulic drive device to achieve the mechanical opening and closing of the sleeve, the dynamic model of the sleeve detach and reunion drive was theoretically measured, and it was verified that the device is simple to operate and convenient to maintain, thus it has great social values.展开更多
Objective: The aim of this work was to quantify the extent of set-up errors to conduct a quality assurance (QA) aspect of treatment delivery, verification of the treatment field's position on different days using ...Objective: The aim of this work was to quantify the extent of set-up errors to conduct a quality assurance (QA) aspect of treatment delivery, verification of the treatment field's position on different days using electronic portal. Methods: This study was carried out on 12 patients, treated for pelvis tumor; and total of 240 images obtained by electronic portal image device (EPID) were analyzed. The EPIs acquire using EPID attached to the Siemens linear accelerator. The anatomy match- ing software (Theraview) was used and displacement in two dimensions were noted for each treatment field to study patient setup errors. Results: The percentages of mean deviations less than 5 mm in X direction were 65% & 92%, from 5-10 mm were 31% & 19% and more than 10 mm were 11% & 9% forNP and lateral direction respectively. The percentages of mean deviations less than 5 mm in Y direction were 65% & 63%, from 5-10 mm were 33% & 28% and more than 10 mm were 22% & 29%. The mean deviations in 2D-vector errors were 〈 5 mm in 47% and 46%, 5-10 mm in 36% and 37% and 〉 10 mm in 37% and 37% of images in the NP and lateral direction respectively. Conclusion: The results revealed that the ranges of set up errors are immobilization method to improve reproducibility. The observed variations were not within the limits..展开更多
文摘The design of sleeve detach and reunion drive device of screw melt ex- truder equipment was optimized, based on the present installation of hygraulic drive device to achieve the mechanical opening and closing of the sleeve, the dynamic model of the sleeve detach and reunion drive was theoretically measured, and it was verified that the device is simple to operate and convenient to maintain, thus it has great social values.
文摘Objective: The aim of this work was to quantify the extent of set-up errors to conduct a quality assurance (QA) aspect of treatment delivery, verification of the treatment field's position on different days using electronic portal. Methods: This study was carried out on 12 patients, treated for pelvis tumor; and total of 240 images obtained by electronic portal image device (EPID) were analyzed. The EPIs acquire using EPID attached to the Siemens linear accelerator. The anatomy match- ing software (Theraview) was used and displacement in two dimensions were noted for each treatment field to study patient setup errors. Results: The percentages of mean deviations less than 5 mm in X direction were 65% & 92%, from 5-10 mm were 31% & 19% and more than 10 mm were 11% & 9% forNP and lateral direction respectively. The percentages of mean deviations less than 5 mm in Y direction were 65% & 63%, from 5-10 mm were 33% & 28% and more than 10 mm were 22% & 29%. The mean deviations in 2D-vector errors were 〈 5 mm in 47% and 46%, 5-10 mm in 36% and 37% and 〉 10 mm in 37% and 37% of images in the NP and lateral direction respectively. Conclusion: The results revealed that the ranges of set up errors are immobilization method to improve reproducibility. The observed variations were not within the limits..