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Table 1 Overall distribution of answers concerning the dose of natural background radiation and commonly performed examinations. Values are expressed in terms of equivalent number of PA-chest X-rays. Right answers are shown in italics

From: Assessment of radiation protection awareness and knowledge about radiological examination doses among Italian radiographers

 

Number of equivalent chest PA X-rays

 

0

1-10

10-50

50-100

100-500

>500

Italian natural background radiation

4.4

51.4

17.7

14.2

10.3

2.0

Lumbar spine X-ray

0.3

47.8

30.5

16.3

4.6

0.4

Bilateral mammography

7.0

50.6

28.2

10.6

3.0

0.7

(two projections each)

Chest CT (without contrast)

1.0

2.8

16.3

26.1

46.9

7.0

Pelvis MRI

95.0

1.7

0.8

0.9

1.1

0.4

F18-FDG PET CT

0.7

4.8

9.4

14.3

28.6

42.2

Abdominal US

96.1

1.5

1.1

0.4

0.8

0.1

99mTc-Sestamibi cardiac scintigraphy

0.9

10.3

15.2

15.4

27.9

30.3

(stress + rest test, 2-day protocol)