Great Lectures!!! Thanks for sharing. I have a question: Exist a tracer that emit X-ray??? We know that X-ray and Gamma-ray have the same nature (eletromagnetic wave/photon) but they are diferent only in their origin. X-ray came from desacelaration of electrons, caracteristic emission, positron-electron combination/aniquilation( 2 photons) etc, and Gamma ray came from nuclear decay (metastable form). When you speak about "Exogenous substance(tracer) emit X-rays"(~14:45) sounds confuse for me. I don't know any tracer that emit X-ray directly, only with tracer (Beta + ) and it's not emited by the tracer is for aniquilation of the positron in the body. It's not Gamma Ray that the tracer(radioative) emit instead of X-ray? Sorry about my english.
No problem. Thanks for your comment. You are correct, we should have stated gamma-rays, as they emanate from radionuclide decay! In terms of interaction with the tissue, there is, however, no difference between the two.
