千分尺：用来测量不同长度，角度等的工具。
MICROMETER: Instrument used to measure various distances, angles, etc.
结果测量出寰椎后弓、侧块、椎动脉沟、后弓侧块螺钉通道的轴线长度，及后弓进钉点和进钉方向等参数。
Result the parameters of posterior arch, lateral mass, vertebral artery groove, axis length of screw pass via posterior arch and lateral mass, projection and direction of screw were measured.
给出了能量、流强、扫描均匀性、扫描长度以及束斑形状等5个重要参数的测量方法及结果。
The methods and results for the 5 main parameters of energy, beam current, dose uniformity, beam scanning width, and beam profile were given.
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