Describes the importance of quality assurance of the radiotherapy and explains the structural design and operation method of the isocenter shoots and laser calibration tools.
本文介绍了放射治疗过程中进行质量检测的重要性，阐述了等中心射野校准工具的结构设计和使用方法。
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The longitudinal resolution and alias at off-isocenter locations are related to factors of distance from the isocenter, interpolation algorithm, reconstruction interval and pitch.