Investigation of whether in-room CT-based adaptive intracavitary brachytherapy for uterine cervical cancer is robust against interfractional location variations of organs and/or applicators

Yoshifumi Oku, Hidetaka Arimura, Tran Thi Thao Nguyen, Yoshiyuki Hiraki, Masahiko Toyota, Yasumasa Saigo, Takashi Yoshiura, Hideki Hirata

Research output: Contribution to journalArticle

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Abstract

This study investigates whether in-room computed tomography (CT)-based adaptive treatment planning (ATP) is robust against interfractional location variations, namely, interfractional organ motions and/or applicator displacements, in 3D intracavitary brachytherapy (ICBT) for uterine cervical cancer. In ATP, the radiation treatment plans, which have been designed based on planning CT images (and/or MR images) acquired just before the treatments, are adaptively applied for each fraction, taking into account the interfractional location variations. 2D and 3D plans with ATP for 14 patients were simulated for 56 fractions at a prescribed dose of 600 cGy per fraction. The standard deviations (SDs) of location displacements (interfractional location variations) of the target and organs at risk (OARs) with 3D ATP were significantly smaller than those with 2D ATP (P < 0.05). The homogeneity index (HI), conformity index (CI) and tumor control probability (TCP) in 3D ATP were significantly higher for high-risk clinical target volumes than those in 2D ATP. The SDs of the HI, CI, TCP, bladder and rectum D2cc, and the bladder and rectum normal tissue complication probability (NTCP) in 3D ATP were significantly smaller than those in 2D ATP. The results of this study suggest that the interfractional location variations give smaller impacts on the planning evaluation indices in 3D ATP than in 2D ATP. Therefore, the 3D plans with ATP are expected to be robust against interfractional location variations in each treatment fraction.

Original languageEnglish
Pages (from-to)677-683
Number of pages7
JournalJournal of radiation research
Volume57
Issue number6
DOIs
Publication statusPublished - Nov 1 2016

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Brachytherapy
Uterine Cervical Neoplasms
organs
rooms
planning
tomography
cancer
Tomography
Therapeutics
rectum
bladder
Rectum
homogeneity
standard deviation
Urinary Bladder
tumors
Organs at Risk
Neoplasms

All Science Journal Classification (ASJC) codes

  • Radiation
  • Radiology Nuclear Medicine and imaging
  • Health, Toxicology and Mutagenesis

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Investigation of whether in-room CT-based adaptive intracavitary brachytherapy for uterine cervical cancer is robust against interfractional location variations of organs and/or applicators. / Oku, Yoshifumi; Arimura, Hidetaka; Nguyen, Tran Thi Thao; Hiraki, Yoshiyuki; Toyota, Masahiko; Saigo, Yasumasa; Yoshiura, Takashi; Hirata, Hideki.

In: Journal of radiation research, Vol. 57, No. 6, 01.11.2016, p. 677-683.

Research output: Contribution to journalArticle

Oku, Yoshifumi ; Arimura, Hidetaka ; Nguyen, Tran Thi Thao ; Hiraki, Yoshiyuki ; Toyota, Masahiko ; Saigo, Yasumasa ; Yoshiura, Takashi ; Hirata, Hideki. / Investigation of whether in-room CT-based adaptive intracavitary brachytherapy for uterine cervical cancer is robust against interfractional location variations of organs and/or applicators. In: Journal of radiation research. 2016 ; Vol. 57, No. 6. pp. 677-683.
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AU - Nguyen, Tran Thi Thao

AU - Hiraki, Yoshiyuki

AU - Toyota, Masahiko

AU - Saigo, Yasumasa

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