[AngelicaDeAlquezar]

Here, doctors say "tomografía" for a CAT, which is the most common, and in medical prescriptions is usually called "tomografía axial computarizada".
They call "(un) PET" the nuclear one, which is called "Tomografia por Emision de Positrones". I've heard "tomografía multicorte" for this last one, but I'm not sure that's the right way to call it.