Assessment the Accuracy and Precision of Target Localization in X-ray Radiosurgery

Purpose: The present article studied the assessment of the accuracy and precision of target localization in X-ray radiosurgery for patients with intracranial tumors. Methods: Measure the CT localization accuracy of X-ray radiosurgery system using special markers in skull phantom, measure the accuracy of isocenter subsystem and simulation of radiosurgery treatment by film method. Assess the accuracy of X-ray radiosurgery treatment for 133 patients by CT localization frame, and used as an instruction for X-ray radiosurgery planning in clinics for sparing vital organs, and observe the complication concerning with these organs. Results: The accuracy of CT localization of BRW headring was 0.65 mm and maximum error was 1.09 mm. The accuracy of SRS200 isocenter subsystem was 0.19 mm. The simulation accuracy of X-ray radiosurgery system was 1.43 mm. The accuracy of target localization using CT localization frame was(1.71±0.62)mm, and no complication concerning with sparing organs was observed in follow-up of these patients. Conclusions: All the results indicate that the accuracy of this X-ray radiosurgery system has come up to the standard of quality control of radiosurgery and the accuracy assessed by CT localization frame has some potential value for X-ray radiosurgery planning.