Which of these is an advantage of a ct scan over an mri?

a. its equipment is more portable.
b. it uses no radiation.
c. it improves the ability to make a diagnosis.
d. it produces a two-dimensional image.

What is the main difference between trace elements and the main elements that make up the body? 1) main elements consist of heavier atoms. 2) trace elements are only needed in small amounts. 3) trace elements consist of heavier atoms. 4) main elements are only needed in small amounts.