Thanks for the responce.
The reason I ask for is, I have had ultrasound in the past.
I had one blast of it last week from the dept. and today it just dawned on me that they didn't use gel when it's always been the first thing they do, the device was put on my heel for a few mins, then on my left calf for a matter of a minute, NO gel was used and I find this rather strange, they did say if i feel any kind of heat at all to say so, fortunatly I didn't.
seems very odd to say the least!!
thanks again for your reply.