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: " Potentials of on-line repositioning based on implanted fiducial markers and electronic portal imaging in prostate cancer radiotherapy. | Radiation Oncology BioMed Central Research Potentials of on-line repositioning based on implanted fiducial markers and electronic portal imaging in prostate cancer radiotherapy Reinhold Graf Peter Wust Volker Budach and Dirk Boehmer Open Access Address Charité Universitatsmedizin Berlin Department of Radiotherapy Campus Virchow-Klinikum Augustenburger Platz 1 13353 Berlin Germany Email Reinhold Graf - Peter Wust - Volker Budach - Dirk Boehmer - Corresponding author Published 27 April 2009 Received 18 January 2009 Radiation Oncology 2009 4 13 doi 1748-717X-4-13 Accepted 27 April 2009 This article is available from http content 4 1 13 2009 Graf 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 To evaluate the benefit of an on-line correction protocol based on implanted markers and weekly portal imaging in external beam radiotherapy of prostate cancer. To compare the use of bony anatomy versus implanted markers for calculation of setup-error plus minus prostate movement. To estimate the error reduction and the corresponding margin reduction by reducing the total error to 3 mm once a week three times per week or every treatment day. Methods 23 patients had three to five mm 0 spherical gold markers transrectally inserted into the prostate before radiotherapy. Verification and correction of treatment position by analysis of orthogonal portal images was performed on a weekly basis. We registered with respect to the bony contours setup error and to the marker position prostate motion and determined the total error. The systematic and random errors are specified. Positioning .
