Final answer:
Of the options provided, radiation therapy typically involves the highest staff radiation exposure due to the use of high doses of ionizing radiation to treat cancer, compared to other imaging techniques like MRI and CT scans which use lower doses or no ionizing radiation respectively.
Step-by-step explanation:
The question Which involves the highest staff radiation exposure pertains to different medical imaging techniques and their associated radiation risks for medical staff. Among the listed options, neuroangiography and radiation therapy are procedures where ionizing radiation is used, which means they pose a risk of radiation exposure to the staff. MRI (Magnetic Resonance Imaging) machines use radio waves and magnets, and do not involve ionizing radiation, thereby presenting no radiation exposure risk to medical staff.
Comparatively CT (Computed Tomography) scans do utilize ionizing radiation; however, the radiation doses from CT scans are generally lower than those used in radiation therapy. Radiation therapy, where gamma rays from radioactive substances like cobalt are used to target and destroy cancer cells, typically involves higher doses of radiation. Because of this of the options provided, radiation therapy typically involves the highest staff radiation exposure with protective measures required to minimize the risks for the medical professionals involved.