PET scans differ from CT and MRI scans in that PET scans:
A)produce clearer images of brain structure.
B)show which regions of the brain are active as a person performs certain tasks.
C)do not involve exposing people to injections of radioactive substances.
D)can better identify the presence of a brain tumor.

Question

Quizplus · Accepted Answer

PET scans show which regions of the brain are active as a person performs certain tasks, which is a functional imaging technique. CT and MRI scans, on the other hand, provide structural images of the brain. PET scans do involve injecting people with a radioactive substance to visualize brain activity, so option C is not correct. While PET scans can detect the presence of a brain tumor, they are not necessarily better than CT or MRI for this purpose, so option D is not the best choice.

PET Scans Differ from CT and MRI Scans in That