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http://dx.doi.org/10.3857/jkstro.2011.29.2.99

Quality Assurance of Intensity Modulated Radiation Therapy: Site-Specific Results of Eulji University Hospital  

Kim, Sung-Jin (Department of Radiation Oncology, Eulji University Hospital, Eulji University College of Medicine)
Lee, Mi-Jo (Department of Radiation Oncology, Eulji University Hospital, Eulji University College of Medicine)
Youn, Seon-Min (Department of Radiation Oncology, Eulji University Hospital, Eulji University College of Medicine)
Publication Information
Radiation Oncology Journal / v.29, no.2, 2011 , pp. 99-106 More about this Journal
Abstract
Purpose: To analyze our quality assurance (QA) data for intensity modulated radiation therapy (IMRT) according to treatment site and to possibly improve QA for IMRT in Hospital. Materials and Methods: We performed QA on 50 patients (head and neck, 28 patients; Breast, 14 patients; Pelvis, 8 patients) for IMRT. The calculated dose from RTP was compared with the measured value film, gamma index, and ionization chamber for dose measurement in each case. Results: The point dose measurement results in 45 of 50 patients showed good agreement with the calculation dose (${\pm}3%$). The largest error measured thus far has been 3.60%, with a mean of only -0.17% (SD, 2.25%). Each treatment site showed an error rate of -0.13% (SD, 1.93%) for head and neck cases, -0.26% (SD, 2.79%) for breast cases, and 0.24% (SD, 2.44%) for pelvis cases. The gamma index verified with the error rate of head and neck cases (6%), breast (10%), and pelvis (6%), which corresponded to a tolerance of 3 mm (3% for the head and neck, 2%, for the breast 1% for the pelvis, and 0% in the region where the isodose curve was greater than 90%. Conclusion: We recognize the cause of errors for each treatment site of IMRT QA and so we maximize our efforts to reduce error and increase accuracy.
Keywords
Intensity-modulated radiation therapy; Quality assurance; Error rate;
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