CT scans of the head, for example, expose patients to about the equivalence of one year of natural radiation. This is about 100 times the radiation dose from a chest X ray. Other CT examinations ...

In its simplest form, a CT scan is used only for the localization of abnormalities seen on a PET scan (non-diagnostic scan). The radiation dose from such a scan can be low (e.g. an effective dose of ...

Compared with energy-integrating CT, ultrahigh-resolution photon-counting CT improves resolution and reduces radiation ...