Table 1 Radiation exposure of different imaging modalities.

Technique	Radiation exposure (mSv)
KUB	0.5–0.9
IVU	1.5–3.5
Regular‐dose CT	8–16
Low‐dose CT	2.8–4.7
Ultra‐low dose CT	0.5–0.7

CT, computed tomography; IVU, intravenous urography; KUB, plain radiograph of the kidney, ureter and bladder.