Health topic

Diagnostic Imaging

How mammography, MRI, CT, ultrasound, X-ray and biopsy work — what to expect, step by step.

160 articles · physician-reviewed · 2 news reports

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Imaging overview
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Diagnostic & Therapeutic Procedures

From a routine mammogram to an MRI after an injury, diagnostic imaging guides some of the most important decisions in medicine. This overview explains the major scan types, what they reveal, and what being a patient actually feels like.

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Feeling overwhelmed? That’s normal.

Take it one step at a time. The sections below move from the basics through screening and treatment — read only what you need right now.Unsure about a term? Check the glossary.

How diagnostic imaging works

Your imaging toolkit

Mammography

The screening standard

MRI, CT & advanced scans

Deeper looks

Biopsy & tissue testing

Getting a definitive answer

Patient preparation & resources

Know before you go

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Further reading