How safe is an ultrasound scan as regards cancer promoting effects?

The only known effect of ultrasound on the human body is concerning the internal temperature. Some studies suggested that a long ultrasound exam can locally raise the temperature between 0.5-1.0 degree. This effect could be especially real with the use of Doppler technique when studying the vascular structures. But then the next question is : what is the effect of raising the temperature. There is no fact to proove that a 0.5-1.0 degree raise can cause cancer. So we can conclude that ultrasound is harmless. We are usually only aware of using Doppler on a first trimester obstetrical ultrasound; to avoid raising the local temperature on the 5 mm fetus.

ultrasound is more safe that x-rays ultrasound throws off laser where xrays throws off radiation which too much causes cancer

The only danger from getting an ultrasound is if the technician squirts that goo in your eye. Ultra sound is NOT laser, it's sound, hence the name. Some people's kids...

Ultra sound is safest.