Case: What Is a Digital Image?

A 45-year-old male presents with persistent headaches and dizziness. A CT scan of the head is ordered to rule out any intracranial abnormalities. The scan is acquired and displayed as a series of digital images for analysis.

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CTAI-GENERATED

The CT scan consists of axial slices of the patient's head, each represented as a digital image with a matrix size of 512x512. The images show varying shades of gray, indicating different tissue densities.

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What does each pixel in a CT image represent?