Abstract
Purpose: The CyberKnife (CK) is a new type of system that is capable of frameless and imageguided robotic controlled stereotactic irradiation. We evaluated the accuracy of irradiation position, radiation dose and distribution.
Methods and Materials: The accuracy of irradiation position: We calculated the accuracy of irradiation position using Gaf-chromic film, a cubic phantom and a head-shaped phantom.
The accuracy of radiation dose and distribution, and as a result of movement of the patient in treatment: We calculated the accuracy by comparing the dose data of the Treatment Planning System (TPS) and EDR2-film in terms of radiation dose and distribution.
Results: The accuracy of irradiation position: The irradiation position errors were 0.31 mm (cubic phantom) and 0.30 mm (head-shaped phantom) on median.
The accuracy of dose and distribution: It was excellent regardless of the collimator size or irradiation methods. As a result of movement of the patient during treatment: No effect was observed in the present assessment.
Summary: The results show that the CK system achieved the same level of accuracy as other devices for stereotactic irradiation. The accuracy of the CK system was satisfactory.
