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: Eight years of IMRT quality assurance with ionization chambers and film dosimetry: experience of the montpellier comprehensive cancer center. | Fenoglietto et al. Radiation Oncology 2011 6 85 http content 6 1 85 RADIATION ONCOLOGY METHODOLOGY Open Access Eight years of IMRT quality assurance with ionization chambers and film dosimetry experience of the montpellier comprehensive cancer center 1 2 11 1 1 Pascal Fenoglietto Benoit Laliberté Norbert Aillères Olivier Riou Jean-Bernard Dubois and David Azria Abstract Background To present the results of quality assurance QA in IMRT of film dosimetry and ionization chambers measurements with an eight year follow-up. Methods All treatment plans were validated under the linear accelerator by absolute and relative measures obtained with ionization chambers IC and with XomatV and EDR2 films Kodak . Results The average difference between IC measured and computed dose at isocenter with the gantry angle of 0 was average 1 SD for 2316 prostate for 808 head and neck h n and for 108 measurements of prostate bed fields. Pelvic treatment showed differences of in 26 fields for prostate cases and in 109 fields of anal canal. Composite measurement at isocenter for each patient showed an average difference with computed dose of for 386 prostate for 158 h n for 23 prostate bed for 4 pelvis and for 17 anal canal cases. On the first 250 h n analyzed by film in absolute dose the average of the points crossing a gamma index 3 and 3 mm was 93 . This value reached 99 for the prostate fields. Conclusion More than 3500 beams were found to be within the limits defined as validated for treatment between 2001 and 2008. Background Intensity modulated radiotherapy IMRT was introduced in France in the early years of this century. The evolution of computing with the ability to support new algorithms and the implementation of multileaf collimators MLC made the development of this technique possible. Our Center was one of the first in France to routinely treat patients using IMRT
