4D Ultrasound

While I was away on vacation, I was informed of new technology called 4D ultrasound. I thought it was pretty freaky, seeing the demonstration of it, because it is still in black and white. You can see the liquid around the baby. I then wondered what type of technology is being used to creat the 4D ultrasound. I wondered if the 4D ultrasound is more harmful than the regular ultrasound? The ultrasound techonology has evolved over the past 40 years. You can set up the 4D ultrasound to e-mails, where other people of your choice can watch your ultrasound. Although, the closest place to have this 4D ultrasound is Montreal. I wonder what they will come up with next?