ASTROMEDICS Health Library · Updated 28 October 2026
General patient education, not a diagnosis or an individual treatment plan. A qualified clinician should assess your symptoms and advise you.
Why different scans are used
Imaging tests use different methods to answer different clinical questions. Understanding why a particular scan has been requested helps you prepare and know what to expect from the report.
Imaging tests create pictures that help health professionals investigate problems and make decisions.
Different tests use different methods; ask why a specific scan is recommended and what preparation is required.
Preparation and safety information
Tell the imaging team about possible pregnancy, implants, allergies and relevant medical history.
Ask how results will be shared and what happens next; a scan result should be interpreted in clinical context.
Preparing for the next step
X-rays and CT use ionising radiation; MRI and ultrasound do not. Tell staff about possible pregnancy, implants and previous contrast reactions. For MRI, implant details are particularly important. Ask for instructions for your exact scan rather than assuming all imaging needs fasting.
Questions for your consultation
- Why is this scan the right test for my symptoms?
- How will I receive the report and who will explain it?