MSD Manual

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Comparing Radiation Doses For Different Tests*

Comparing Radiation Doses For Different Tests*

Imaging Test

Number of Chest X-Rays Needed to Get the Same Dose

Time Needed to Get the Same Dose From the Environment

Chest x-ray (from front to back)

1

2.4 days

An x-ray series of the lumbar spine

75

84 days

CT of the head

100

243 days

Coronary artery angiography during cardiac catheterization

350–750

1.15–2.3 years

CT of the abdomen

300–400

3.3 years

Mammography

20

30–60 days

*These doses account for how much radiation is delivered and how susceptible the body part exposed to radiation is to radiation damage.

CT = computed tomography.