The VTI provides a set of hooks called purpose functions.

VTI提供一组称为目的函数的hooks。

Many surgical specialties are served by VTI Intraoperative Doppler Systems.

许多外科在使用VTI术中多普勒系统。

This functionality is built upon the virtual table interface (VTI) provided by IDS.

该功能建立在 IDS 提供的虚表接口（VTI）之上。

This demonstration VTI UDR shows only four of the complete set of purpose functions.

该演示VTI UDR仅显示完整的目的函数集中的4个。

You will need to implement all of the remaining purpose functions for a complete VTI UDR.

您将需要为完整的VTI UDR实现所有其余的目的函数。