My children have had whole abdomen ultrasounds, plus renal and others that target specific areas. In their case it was used both as a diagnostic tool, particularly the renal ones and also because of their age, build and radiation risks.
I am two minds about their accuracy. For renal and other organs like that they were good but for picking up the issues but with the terminal ileum they were so so. I will explain...My daughter had a renal ultrasound prior to diagnosis, it picked up a problem with her kidney, hydronephrosis, and she went onto to have nuclear scanning done. It showed there was a some slowing of the kidney but otherwise structurally okay. I know it was a renal ultrasound but it failed to pick that there must have been inflamed bowel obstructing the ureter.
Then when my son was queried with Crohn's and I went in with the specific history of my daughter and her disease location, plus the doctors notes of my son's examination, a right lower quadrant mass, it failed to pick up any abnormality with the bowel. Just some free fluid of unknown significance. When my daughter's GI was contacted about the results he did not believe them and my son was sent back the following day to be redone. Sure enough on the second screening, with the radiologist in the room this time, they found what the GP was feeling, thickened terminal ileum. Once they found the problem it was very accurate at predicting the size of the area affected and the narrowing that was present.
I personally feel that if they are looking at the bowel and you have a diagnosis and know the area to target then they are a useful diagnostic tool.
Dusty.