牙科数字减影放射成象需要对病人和x射线源进行准确的复位,以利于对骨丢失的正确诊断。现行的机械复位系统不允许对后位牙齿的放射成象,且病人使用该系统时感到不适。一个新的复位系统业已提出,该系统使用了一个六自由度的位置传感器和一个带有x射线源的机器人臂。该系统的一个数字模型业已给出,并且这 Dental digital subtraction radiography requires accurate patient and x-ray source reduction to facilitate the correct diagnosis of bone loss. Current mechanical reset systems do not permit radiographic imaging of the posterior teeth and the patient feels discomfort using the system. A new resetting system has been proposed that uses a six-degree-of-freedom position sensor and a robotic arm with an x-ray source. A numerical model of the system has been given, and this