New Scientist has a gallery of wonderful images from radiologist Kai-hung Fung who makes awesomely beautiful pictures from CT scans.
The brain image (pictured) is particularly beautiful, it is labelled:
This image looks directly down through the top of the patient’s head.
The complex network of arteries and veins in the brain can be seen in shades of dark blue and the skull base is shown in green in the background.
Link to gallery of beautiful Kai-hung Fung images.