An analysis of displacement of internal organ for improvement of respiratory-gated irradiation therapy

Masanori Higuchi, Takao Yamamoto, Hideki Okamura, Naoya Ohta, Yasuyuki Maki, Takeshi Ebara, Toshiaki Dobashi

Research output: Contribution to journalArticle


We have analyzed a displacement of lung tissues induced by aspiration and expressed it by a phenomenologically derived ellipsoidal harmonics for time course of craniocaudal displacement for a cycle of aspiration. A fitting of the equation to 4DCT images for a pair of lung of five individuals was used for the analysis of the displacement. The observed data were fitted well to the phenomenological equation. The positional dependence of the fitting parameters was reasonably explained. It is suggested that the parameter that denotes the width of the expiration phase could be used to evaluate the validation of the respiratory-gated imaging technique in irradiation therapy for each patient.

Original languageEnglish
Pages (from-to)195-204
Number of pages10
JournalNihon Reoroji Gakkaishi
Issue number4
Publication statusPublished - Jan 1 2016
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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