The reason why it is necessary to use medical special voltage regulator, the main reason is because in the modern medical system of various CT machine, DR, X-ray machine, nuclear magnetic **** vibration of the use. Unquestionably, these devices have a critical role in determining the human condition, but if the power supply is not properly configured, it is easy to make the CT machine, X-ray machine resolution does not reach a good result, so the doctor's diagnosis to bring trouble, but also may be misleading or delayed as a result of the condition. In addition to these medical equipment itself using power supply characteristics, one is the lesion exposure requirements regulator power supply output current, voltage drop is small, this moment is not regulated; Secondly, the CT machine itself electrical rectifier circuit, so it is easy to generate harmonics, and the existence of such harmonics, naturally, will affect the regulator power supply action control is incorrect, so like the CT, nuclear magnetic **** vibration, home-made DR and ultrasound and other these medical with the Specialized voltage regulator and UPS uninterruptible power supply is essential.