How much radiation is that, really?

    Pick the imaging studies you've had — see total dose in millisieverts (mSv) with comparisons to natural background radiation, transatlantic flights, and chest X-rays. Built for patients and the clinicians explaining results to them.

    Radiation Dose Summary

    Generated · gighz.com/radiation-dose-calculator/ · Estimates based on ACR Relative Radiation Levels.

    Diagnostic imaging is one of the most studied risks in medicine. The dose from a single CT is a fraction of what most people receive from natural background radiation each year. This tool gives you context — it is not medical advice, and actual delivered dose varies by body habitus, scanner, and protocol.

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    Written and reviewed by Pouyan Golshani, MD, Interventional Radiologist — Last updated May 6, 2026