tailieunhanh - Báo cáo khoa học: " Assessment of three-dimensional set-up errors in conventional head and neck radiotherapy using electronic portal imaging device"

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: | Radiation Oncology BioMed Central Open Access Short report Assessment of three-dimensional set-up errors in conventional head and neck radiotherapy using electronic portal imaging device Tejpal Gupta 1 Supriya Chopra2 Avinash Kadam1 Jai Prakash Agarwal2 P Reena Devi1 Sarbani Ghosh-Laskar2 and Ketayun Ardeshir Dinshaw2 Address Department of Radiation Oncology Advanced Centre for Treatment Research Education in Cancer ACTREC Tata Memorial Centre Kharghar Navi Mumbai India and 2Department of Radiation Oncology Tata Memorial Hospital Parel Mumbai India Email Tejpal Gupta - tejpalgupta@ Supriya Chopra - supriyachopra@ Avinash Kadam - avinash22779@ Jai Prakash Agarwal - agarwaljp@ P Reena Devi - ibph2001@ Sarbani Ghosh-Laskar - laskars2000@ Ketayun Ardeshir Dinshaw - Corresponding author Published 14 December 2007 Received 16 July 2007 Accepted 14 December 2007 Radiation Oncology 2007 2 44 doi 1748-717X-2-44 This article is available from http content 2 1 44 2007 Tejpal 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 Set-up errors are an inherent part of radiation treatment process. Coverage of target volume is a direct function of set-up margins which should be optimized to prevent inadvertent irradiation of adjacent normal tissues. The aim of this study was to evaluate threedimensional 3D set-up errors and propose optimum margins for target volume coverage in head and neck radiotherapy. Methods The dataset consisted of 93 pairs of orthogonal simulator and corresponding portal images on which 558 point