5. Stereotactic Radiosurgery Using Linear Accelerator
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概要
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Stereotactic radiosurgery using linear accelerator was performed at Dept. of Radiation Oncology, Yonsei University College of Medicine from Aug, 1988 to Oct, 1991. During that time 41 cases of patients with AVM, astrocytoma, meningioma, etc were treated with radiosurgery. The treatment planning and dosimetry of small fields for stereotactic radiosurgery with 10MV X-ray isocentically mounted linear accelerator will be presented. Special consideration in this study was given to the variation of absorbed does with field size, the central axis percent depth doses and the combined moving beam dose distribution. The collimator scatter correction factors of small fields (1×1-3×3.5(cm)^2) were measured with ion chamber at a target chamber distance of 300 cm where the projected fields were larger than the polystyrene buildup caps and it was calibrated with the tissue equivalent solid state detectors of small size (TLD, PLD, ESR and semiconductors). The three dimensional does planning of stereotactic focusing irradiation on small size tumor regions was performed with dose planning computer system (Therac 2300) and was verified with film dosimetry. The more the number of strips and the wider the angle of arc rotation, the larger were the dose delivered on tumor and the less the dose to surrounding the normal tissues. In this study, the using machine and method was as following. 1) Apparatus : NELAC-1018 10MV X-ray. 2) Distance : SCD (Source Axis Center Distance) 100cm. 3) Cone and Field size : Small field size are from 1×1(cm)^2 to 3×3.5(cm)^2, and special circular cone designed for the purpose of minimized the risk to normal tissues and those size are 0.7-3.6cm φ.
- 公益社団法人日本放射線技術学会の論文
- 1992-03-01