Development of re-locatable head frame system using hydraulic arms for fractionated stereotactic radiotherapy and ct evaluation of repositioning accuracy

Masayuki Kltamura, Etsuo Kunieda, Osamu Kawaguchi, Yutaka Ando, Naoyuki Shigematsu, Toshiyuki Shiba, Atsushi Kubo

研究成果: Article査読

1 被引用数 (Scopus)

抄録

The purpose of this study was to develop a novel re-locatable head frame system consisting of a dental cast and hydraulic arms as an immobilization device for fractionated stereotactic radiotherapy and to evaluate the repositioning accuracy by measurement of landmark coordinates in repeated computed tomography (CT) examinations. The acrylic dental casts were customized for each patient. First the dental cast was attached to the upper jaw of the patient, then the dental cast was connected to a Leksell stereotactic frame, which was finally secured by two hydraulic arms. Since this system is compatible with the Leksell frame, stereotactic indicators could be used to obtain coordinates of anatomical landmarks of the head. Seven patients treated by fractionated stereotactic radiotherapy underwent repeated quality-assurance CTs during their treatment courses. We evaluated the coordinates of the short process of incus and the top of crista galli as reference points for evaluation of variation in a total of 26 repeat CT data sets, and then x, y, and z fluctuations relative to their positions in the treatment-planning CTs. The distances among the reference points of both processes of incus and the top of crista galli were calculated to evaluate the feasibility of the method. The distances were less than 0.5 mm on averages and less than 1 mm in the standard deviations. The respective fluctuations in the x, y and z directions were less than 1 mm in mean values and less than 2 mm in standard deviations. The fluctuations in distance were less than 2 mm on average and in standard deviations. The Huctuation of the center of three reference points was 0.7 mm on average and the rotation of the cranium was 1.0 degree in average. We concluded that our evaluation method is feasible and the reproducibility of the fixation system is acceptable for its routine use in stereotactic radiotherapy.

本文言語English
ページ(範囲)107-112
ページ数6
ジャーナルJournal of JASTRO
14
2
DOI
出版ステータスPublished - 2002
外部発表はい

ASJC Scopus subject areas

  • 放射線学、核医学およびイメージング
  • 腫瘍学

フィンガープリント

「Development of re-locatable head frame system using hydraulic arms for fractionated stereotactic radiotherapy and ct evaluation of repositioning accuracy」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル