@misc{oai:repo.qst.go.jp:00060381,
 author = {Kanematsu, Nobuyuki and Matsufuji, Naruhiro and Kohno, Ryosuke and Minohara, Shinichi and Kanai, Tatsuaki and 兼松 伸幸 and 松藤 成弘 and 河野 良介 and 蓑原 伸一 and 金井 達明},
 month = {May},
 note = {A method to establish the relationship between CT number and effective density for therapeutic radiations is presented. We approximated body tissues to binary mixtures out of muscle, air, fat, and bone. Consequently, the relationship can be calibrated only with a CT scan of their substitutes, for which we chose water, air, ethanol, and potassium phosphate solution, respectively. With simple and specific corrections for non-equivalencies of the substitutes, the calibration accuracy of 1% will be achieved. The proposed method would offer accuracy, simplicity, and specificity required for a standard in radiotherapy treatment planning, in particular, with heavy charged particles., 14th International Conference on the Use of Computers in Radiation Therapy},
 title = {A simple and accurate CT number to density calibration method for radiotherapy treatment planning},
 year = {2004}
}