方法：分别利用标准水模、正常动物和肿瘤模型对镍钛合金支架置入前后的吸收剂量变化进行测量。
Methods: Standard water tank, normal animal and animal tumor model were used to assess the dosage change before and after a NiTi stent placement.
微特征模仁使用的基材为镍金属，镍金属在大气和碱液中化学性质的安定性好，不易变色且具有良好的耐蚀性和延展性并且易于抛光等优点。
The substrate in micro mold insert is nickel metal which is stable in the air and alkaline liquid. Nickel color won't wear out and nickel has good corrosion resistance.
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