Tuyển tập các báo cáo nghiên cứu về y học được đăng trên tạp chí y học Radiation Oncology cung cấp cho các bạn kiến thức về ngành y đề tài: "Impact of different leaf velocities and dose rates on the number of monitor units and the dose-volume-histograms using intensity modulated radiotherapy with sliding-window technique. | Radiation Oncology BioMed Central Research Impact of different leaf velocities and dose rates on the number of monitor units and the dose-volume-histograms using intensity modulated radiotherapy with sliding-window technique Hilke Vorwerk Daniela Wagner and Clemens F Hess Address Department of Radiotherapy and Radiooncology University Hospital Gottingen Robert-Koch-Str. 40 37099 Gottingen Germany Email Hilke Vorwerk - Clemens F Hess - cfhess@ Corresponding author Open Access Published 23 September 2008 Received 26 March 2008 Accepted 23 September 2008 Radiation Oncology 2008 3 3 1 doi 1748-717X-3-31 This article is available from http content 3 1 31 2008 Vorwerk et al licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License http licenses by which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. Abstract__ Background Intensity modulated radiotherapy IMRT using sliding window technique utilises a leaf sequencing algorithm which takes some control system limitations like dose rates DR and velocity of the leafs LV into account. The effect of altering these limitations on the number of monitor units and radiation dose to the organs at risk OAR were analysed. Methods IMRT plans for different LVs from cm sec to cm sec and different DRs from 100 MU min to 600 MU min for two patients with prostate cancer and two patients with squamous cell cancer of the scalp SCCscalp were calculated using the same optimal fluence map . For each field the number of monitor units the dose volume histograms and the differences in the actual fluence maps of the fields were analysed. Results With increase of the DR and .
