Stroke with speech loss. Colour Positron Emission Tomography (PET) brain scans of a healthy patient (at left) versus stroke patient. Horizontal slices are seen through the temporal lobes. The stroke affected brain shows a lesion (arrowed), an area of brain damage with low blood flow and activity. This affected area has led to 'aphasia', partial loss of speech. Colour-coding is: high brain activity (red/yellow); low activity (blue). Stroke or cerebrovascular accident (CVA), is a rupture or blockage of a blood vessel leading to brain damage and sometimes paralysis. PET scanning shows blood flow and metabolic activity in the brain.

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