日本放射線技術学会雑誌
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
臨床技術
肺定位放射線治療における線量計算アルゴリズムの違いによる線量計算への影響—Pencil Beam Convolution(不均質補正:Batho Power Law)法およびAnalytical Anisotropic Algorithm法の比較—
橘 昌幸野口 佳孝福永 淳一平野 奈緒美吉留 郷志廣瀬 貴章
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2009 年 65 巻 8 号 p. 1064-1072

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The monitor unit (MU) was calculated by pencil beam convolution (inhomogeneity correction algorithm: batho power law) [PBC (BPL)] which is the dose calculation algorithm based on measurement in the past in the stereotactic lung irradiation study. The recalculation was done by analytical anisotropic algorithm (AAA), which is the dose calculation algorithm based on theory data. The MU calculated by PBC (BPL) and AAA was compared for each field. In the result of the comparison of 1031 fields in 136 cases, the MU calculated by PBC (BPL) was about 2% smaller than that calculated by AAA. This depends on whether one does the calculation concerning the extension of the second electrons. In particular, the difference in the MU is influenced by the X-ray energy. With the same X-ray energy, when the irradiation field size is small, the lung pass length is long, the lung pass length percentage is large, and the CT value of the lung is low, and the difference of MU is increased.

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© 2009 公益社団法人 日本放射線技術学会
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