Pros: Fast, low rad. Good for perforated viscus (PUD), obstruction/volvulus
Cons: bad for basically everything else
Pros: no rad. Good for AAA, ectopic, RUQ pain, intussusception, pyloric stenosis, hydronephrosis, pelvic stuff
Cons: limited penetration, can be slow
Pros: test of choice for most. Good for appendicitis, diverticulitis, stones, trauma
Cons: lot of rad. Need good kidney fxn.