医学物理
Online ISSN : 2186-9634
Print ISSN : 1345-5354
解説
TPSにおける密度変換の取扱について
磯辺 智範森 祐太郎武居 秀行佐藤 英介只野 喜一小林 大輔富田 哲也榮 武二
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ジャーナル フリー

2016 年 36 巻 3 号 p. 156-160

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Conversion from CT value to density is essential to a radiation treatment planning system. Generally CT value is converted to the electron density in photon therapy. In the energy range of therapeutic photon, interactions between photons and materials are dominated with Compton scattering which the cross-section depends on the electron density. The dose distribution is obtained by calculating TERMA and kernel using electron density where TERMA is the energy transferred from primary photons and kernel is a volume considering spread electrons. Recently, a new method was introduced which uses the physical density. This method is expected to be faster and more accurate than that using the electron density. As for particle therapy, dose can be calculated with CT-to-stopping power conversion since the stopping power depends on the electron density. CT-to-stopping power conversion table is also called as CT-to-water-equivalent range and is an essential concept for the particle therapy.

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© 2016 日本医学物理学会
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