Is there a difference between a computer power supply and a medical b ultrasound power supply?

Certainly there is a difference. Different electronic equipment according to their own needs will have a targeted design and supporting the appropriate power supply unit. At present, many medical equipment is combined with computer technology, as the power supply of medical equipment and computer mainframe power supply in the principle and circuit is similar, but specific to different equipment and power unit conversion voltage and current is certainly not the same.