由于科学技术的飞速发展，各种影像设备如B超、CT、MR等的出现，延长了我们的视觉．使外科医生不用通过手术打开人体组织即可看到精确的人体内部结构、病变的大小及与周围组织的关系；而医疗器械的发展如导管、穿刺针、内窥镜等则延长了我们的双手，使临床医生不用打开人体组织 Due to the rapid development of science and technology, the appearance of a variety of imaging equipment such as ultrasound, CT, MR and so on, extending our vision. So that the surgeon can see the accurate internal structure of the human body, the size of the lesion and the relationship with the surrounding tissue without opening the human tissue by surgery; and the development of medical devices such as catheters, puncture needles and endoscopes prolongs our hands , So clinicians do not have to open human tissue