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CAT scan or CT scan
"CAT scans are good at showing up whether you've had a haemorrhage. They can also show if something other than a stroke is causing the problem."
CAT is short for Computerised Axial Tomogram.
The CAT machine makes X-rays of your brain. It works very slowly. It takes many X-rays, section by section.
Some people have an injection of dye to make the X-ray clearer.
You have to lie on a narrow bed. The bed slides through a ring-like structure. You may have to lie still for a long time.