Open AccessBiological Cell Survival Mapping for Radiofrequency Intracavitary Hyperthermia Combined with Simultaneous High Dose‐rate Intracavitary Irradiation
Author(s) -
Kurosaki Hiromasa,
Sakurai Hideyuki,
Mitsuhashi Norio,
Tamaki Yoshio,
Akimoto Tetsuo,
Takahashi Takeo,
Furuta Masaya,
Saitoh Junichi,
Hayakawa Kazushige,
Niibe Hideo
Publication year - 2001
Publication title -
japanese journal of cancer research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 0910-5050
DOI - 10.1111/j.1349-7006.2001.tb01053.x
Subject(s) - hyperthermia , imaging phantom , nuclear medicine , brachytherapy , irradiation , radiation therapy , hyperthermia treatment , radiation treatment planning , biomedical engineering , radiation , materials science , homogeneous , cell survival , medicine , chemistry , radiology , in vitro , optics , physics , biochemistry , thermodynamics , nuclear physics
We examined the best way to combine recently developed radiofrequency intracavitary hyperthermia with simultaneous high dose‐rate intracavitary brachytherapy in an original experimental model. Temperature distribution was measured with an experimental phantom which was immersed in a water bath with the temperature controlled at 37°C. Radiation dose distribution was calculated with a treatment‐planning computer. Cell survival was measured by colony assay with HeLa‐TG cells in vitro. Radiation dose response at 1‐7 Gy and time response with hyperthermia in the range of 40‐46°C were estimated. Radiation dose‐response curves in simultaneous treatment with hyperthermia for 30 min at 37 to 46°C were estimated and the surviving fractions in combined treatment were plotted against temperature. For intracavitary radiation alone, cell survival rates increased with increasing distance from the source. For intracavitary hyperthermia alone, the maximum temperature was observed at a depth of 13 mm from the surface of the applicator under suitable treatment conditions. Homogeneous cell killing from the surface of the applicator to a tumor depth of 13 mm was observed under a specific treatment condition. Our experimental model is useful for evaluating the best simultaneous combined treatment.