None Low Moderate High Very High (>0 to 3) (>3 to 20) (>20 to 50) (>50) Annual Effective Dose (mSv per year)

Overall Study Population No. Subjects With ≥1 Imaging Procedures Using Ionizing Radiation No. (%) Annual Effective Radiation Dose from Medical Imaging Procedures (mSv) Mean (±SD)Median (IQR) All subjects (68.8)2.4(±6.0)0.1( ) Age groups (49.5)1.0(±3.5)0.0( ) (65.7)1.6(±4.5)0.1( ) (72.1)2.0(±5.1)0.2( ) (74.9)2.6(±6.0)0.3( ) (78.2)3.3(±6.9)0.4( ) (79.5)4.1(±7.9)0.5( ) (85.9)5.2(±9.1)0.9( ) Gender Men (57.9)2.3(±6.1)0.0( ) Women (78.7)2.6(±5.9)0.3( )

Low ≤3 mSv/year Moderate >3 to 20 mSv/year High >20 to 50 mSv/year Very-High >50 mSv/year All individuals Age groups Gender Men Women Annual Rates of Low, Moderate, High, and Very-High Radiation Exposures per 1000

ProcedureDose (mSv) Annual Dose /person Proportion of Overall Radiation 1. Myocardial perfusion imaging % 2. CT of the abdomen % 3. CT of the pelvis % 4. CT of the chest % 5. Diagnostic cardiac catheterization % 6. X-ray of the lumbar spine % 7. Mammography % 8. CT angio of the chest (non-coronary) % 9. Upper GI series % 10. CT of the head/brain % 11. Percutaneous coronary intervention % 12. Bone scan (nuclear) % 13. X-ray of the abdomen % 14. CT of the cervical spine % 15. CT of the lumbar spine % 16. Chest x-ray % 17. Thyroid uptake scan % 18. Intravenous urography % 19. CT of the neck % 20. Cardiac resting ventriculography %

Distribution of Total Radiation Exposure by the Type of Imaging Procedure

Distribution of Total Radiation Exposure by Anatomic Site of the Imaging Procedure

Distribution of Total Radiation Exposure by Location of Service of the Imaging Procedure