Fast Approximate Dose Model Used in Arc Therapy

아크 치료를 위한 고속 근사선량모델 개발

  • Suh, Tae-Suk (Catholic University Medical College, Department of Radiology) ;
  • Suh, Doug-Young (Kyung Hee University Electrical Engineering Department)
  • 서태석 (가톨릭대학교 의과대학 치료방사선과) ;
  • 서덕영 (경희대학교 공과대학 전자공학과)
  • Published : 1995.12.30

Abstract

Using beam data and accurate 3D dose model, a study of the spatial dose distribution for various arcs was carried out. The dose dirstibution generated by the accurate dose model could be represented by a simple approximate analytic form which is convenient and very efficient for calculating dose distribution iteratively in the optimization procedure. We developed an empirical cylindrical dose model to compute dose for one full rotational arc or partial rotational arc. After a tedious search for fits to a collection of 200 points of accurate dose data, we found simple formular with 7 parameters search. As a consequence, the programs required approximately less than 1 second to compute dose for one single arc on a 20 by 20 matrix (400 points) using fast approximate dose model. In conclusion the fast approximate dose model give dose distributions similar to the accurate dose model, which makes this fast dose model an attractive alternative to the accurate 3D dose model.