Objective: To make a phantom for the evaluation of the quality of MRI and CT images in the stereotactic radiotherapy of the intracranial tumors to assure the accuracy of the radiotherapy.

• 目的:制作出体模来评估颅内肿瘤立体定向放疗中所使用的计算机断层扫描(CT)和核磁共振(MRI)影像的质量,以保证放疗的精度。