Which neuroimaging study specifies which artery or arteries are occluded in a patient with a stroke?

CT or MR angiography is the correct choice because these imaging techniques provide detailed images of blood vessels in the brain. They specifically help in identifying any occlusions (blockages) in arteries that may be contributing to a stroke. CT angiography uses X-rays to visualize blood vessels after a contrast dye is injected, while MR angiography uses magnetic resonance imaging to achieve the same goal. Both methods are essential for diagnosing vascular issues, guiding treatment options, and determining the extent of damage caused by a stroke.

In contrast, electroencephalography primarily measures electrical activity in the brain, magnetoencephalography measures magnetic fields produced by neuronal activity, and evoked-response potentials assess brain responses to specific stimuli. While these methods can provide valuable information about brain function, they do not specifically visualize blood vessels or identify occlusions in arteries, making them ineffective for diagnosing stroke-related vascular issues.