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KMID : 1164220140260020363
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Journal of Korean Society for Radiotherapeutic Technology
2014 Volume.26 No. 2 p.363 ~ p.368
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The evaluation of properties for radiation therapy techniques with flattening filter-free beam and usefulness of time and economy to a patient with the radiation therapy
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Goo Jang-Hyeon
Won Hui-Su
Hong Joo-Wan
Chang Nam-Joon
Park Jin-Hong
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Abstract
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Purpose : The aim of this study was to appraise properties for radiation therapy techniques and effectiveness of time and
economy to a patient in the case of applying flattening filter-free (3F) and flattening filter (2F) beam to the radiation therapy.
Materials and Methods : Alderson rando phantom was scanned for computed tomography image. Treatment plans for
intensity modulated radiation therapy (IMRT), volumetric modulated arc therapy (VMAT) and stereotactic body radiation therapy(SBRT) with 3F and 2F beam were designed for prostate cancer. To evaluate the differences between the 3F and 2F beam, total monitor units (MUs), beam on time (BOT) and gantry rotation time (GRT) were used and measured with TrueBeam™ STx and Surveillance And Measurement (SAM) 940 detector was used for photoneutron emitted by using 3F and 2F. To assess temporal and economical aspect for a patient, total treatment periods and medical fees were estimated.
Results : In using 3F beam, total MUs in IMRT plan increased the highest up to 34.0% and in the test of BOT, GRT and
photoneutron, the values in SBRT plan decreased the lowest 39.8, 38.6 and 48.1%, respectively. In the temporal and
economical aspect, there were no differences between 3F and 2F beam in all of plans and the results showed that 10 days and 169,560 won was lowest in SBRT plan.
Conclusion : According as the results, total MUs increased by using 3F beam than 2F beam but BOT, GRT and photoneutron decreased. From above the results, using 3F beam can decrease intra-fraction setup error and risk of radiation-induced secondary malignancy. But, using 3F beam did not make the benefits of temporal and economical aspect for a patient with the radiation therapy.
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KEYWORD
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Flattening filter-free beam, photoneutron, stereotactic body radiation therapy
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