As far as this description is concerned, it sounds fishy because the goal is to view the surface of the colon and to do that the colon must be cleaned out. Putting food in there makes no sense to accomplish this. In addition, you�d have to hang around the hospital for a couple of days depending on your transit rate.Ultrasound to replace colonscopy also sounds fishy because ultrasound has trouble viewing lumens that contain gas and you still have to be cleaned out.I know there are some people experimenting with a technique called virtual colonoscopy. It involves using barium and a spiral CT scanner. However, the prep is still needed and the procedure is probably intended to be for screening for colon cancer. Perhaps you heard about this. If you get the details, please post.