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J Korean Soc Ther Radiol > Volume 10(2); 1992 > Article
Journal of the Korean Society for Therapeutic Radiology 1992;10(2): 137-146.
Dose Characteristics of Stereotactic Radiosurgery in High Energy Linear Accelerator Photon Beam
Tae Jin Choi, Ok Bae Kim
Department of Therapeutic Radiology, School of Medicine. Keimyung University, Taegu, Korea.
ABSTRACT
Three-dimensional dose calculations based on CT images are fundamental to stereotactic radiosurgery for small intracranial tumor. In our stereotactic radiosurgery program, irradiations have been performed using the 6 MV photon beam of linear accelerator after stereotactic CT investigations of the target center through the beam's-eye view and the coordinates of BRW frame converted to that of radiosurgery. Also we can describe the tumor diameter and the shape in three dimensional configuration. Non-coplanar irradiation technique was developed that it consists of a combination of a moving field with a gantry angle of 140degree, and a horizontal couch angle of 200degreearound the isocenter In this radiosurgery technique, we provide the patient head setup in the base-ring holder and rotate around body axis. The total gantry moving range shows angle of 2520 degrees via two different types of gantry movement in a plane perpendicular to the axis of patient. The 3-D isodose cuties overlapped to the tumor contours in screen and analytic dose profiles in calculation area were provided to calculate the thickness of 80% of tumor center dose to 20% of that. Furtheremore we provided the 3-D dose profiles in entire calculation plane. In this experiments, measured isodose cuties in phantom irradiation have shown very similar to that of computer generations.
Key Words: Linear accelerator photon beam, Non-orthogonal irradiation, 3-D dose computation
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