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KMID : 0859320110290020099
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Journal of the Korean Society for Therapeutic Radiology and Oncology
2011 Volume.29 No. 2 p.99 ~ p.106
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Quality Assurance of Intensity Modulated Radiation Therapy: Site-Specific Results of Eulji University Hospital
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Kim Sung-Jin
Lee Mi-Jo
Youn Seon-Min
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Abstract
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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 (±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.
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KEYWORD
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Intensity-modulated radiation therapy, Quality assurance, Error rate
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