The restrict range of gantry Angle enlarged with larger field size and smaller treatmentdepth.
机架角布野受限范围随射野面积的增大而增大，随治疗深度的减小而增大。
2
A downhole tool used to confirm or correlate treatmentdepth using known reference points on the casing string.
利用套管柱上的已知的基准点来确认或对比处理深度所用的井下仪器。
3
On this foundation, the determination method of treatmentdepth for subgrade paved with expansive soil is proposed based on the relationship of swelling pressure and unloaded expansibility.