Question

which of the following is a contrast x - ray technique?
○ positron emission tomography
○ functional mri
○ structural magnetic resonance imaging
○ angiography

Explanation:

Positron - emission tomography (PET) uses radioactive tracers that emit positrons and is not an X - ray technique. Functional MRI (fMRI) and structural magnetic resonance imaging (MRI) use magnetic fields and radio waves, not X - rays. Angiography is a contrast X - ray technique where a contrast medium is injected into blood vessels and then X - rays are used to visualize the vessels.

Answer:

angiography