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What makes PET and SPECT so unique when it comes to nuclear imaging?

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What makes PET and SPECT so unique when it comes to nuclear imaging?

(a) Do not require dyes

(b) Do not require X – Rays

(c) They show the metabolic functions

(d) They give more details about the imaged organ/tissue

I had been asked this question in unit test.

My question is taken from PET & SPECT topic in portion Diagnostic Investigation via Imaging Techniques of Clinical Science

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Right answer is (c) They show the metabolic functions

The explanation is: The dyes used in PET and SPECT are such that they become a part of the metabolic pathways and the transmitted radiations can help visualize the metabolic pathways. The machine that does the same work as PET and SPECT, i.e. visualizing the metabolic pathways is fMRI. However, since it does not use any dyes, it does not fall under nuclear imaging.

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