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A 42-year-old member asked:

What is the difference between ct and xray?

1 doctor answer1 doctor weighed in
Dr. Piotr Obara
Radiology 14 years experience
Contrast: An xray (also called radiograph) is done by sending xrays through a body part but only in one projection so there is overlap of body parts and contrast is not very good. Ct also uses xrays but the final cross-sectional image (slice) is reconstructed from a combination of xrays shot from multiple directions/projections; therefore, there is no overlap of body parts and much better contrast.

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Last updated Jan 10, 2014

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