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KMID : 0362919920100020137
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1992 Volume.10 No. 2 p.137 ~ p.145
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Dose Characteristics of Stereotactic Radiosurgery in High Energy Linear Accelerator Photon Beam
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Choi Tae-Jin
Kim Ok-Bae
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Abstract
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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 140°, and a horizontal couch angle of 200°around 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.
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KEYWORD
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Stereotactic radiosurgery, Linear accelerator photon beam, Non-orthogonal irradiation, 3-D dose computation
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