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定位操作及定位后CT表现。A：四钩定位针定位后CT表现（箭头）；B：记忆合金弹簧圈定位后CT表现（箭头）；C：定位操作图。
Operation process of positioning and CT performance after localization. A: CT performance after localization of four-hook needle (arrow); B: CT performance after localization of memory alloy coil (arrow); C: Operation diagram.
