I'm confused about what percentage of BaSO4 I need for a scan guide. I have read everything I can find, but the percentages vary from 10 to 30% in the teeth and 3 - 15% in the base. This is for a cone-beam CT scanner. The Dr. doesn't know either, but he does want a dual gradient. I hear about "noise" caused by anything above 12%, but then others say 30%. Any quick answers would be greatly appreciated. I need to make this thing today if possible. Thanks!