Table 1:
Estimated Values for Number of Procedures, Collective Effective Doses, and Average Individual Effective Doses according to Modality for 2006 and 2016
| Analysis Metrics | CT* | Radiography | Noncardiac Interventional Fluoroscopy | Cardiac Interventional Fluoroscopy | Dental | Nuclear Medicine | Total |
|---|---|---|---|---|---|---|---|
| Summary 2016 | |||||||
| No. of procedures (in millions) | 74 | 275 | 4 | 4.1 | 320 | 13.5 | 691 |
| Collective effective dose (person-Sv) | |||||||
| With ICRP 2007 tissue-weighting factors (SUS 103) | 444 000 | 71 000 | 40 000 | 42 000 | 14 000 | 106 000 | 717 000 |
| With ICRP 1990 tissue-weighting factors (SUS 60) | 469 000 | 71 000 | 40 000 | 42 000 | NA | 133 000 | 755 000 |
| Average individual effective dose (mSv) | |||||||
| With tissue-weighting factors from ICRP 2007 (EUS 103) | 1.37 | 0.22 | 0.12 | 0.13 | 0.04 | 0.32 | 2.2 |
| With tissue-weighting factors from ICRP 1990 (EUS 60) | 1.45 | 0.22 | 0.12 | 0.13 | NA | 0.41 | 2.3 |
| Summary 2006 | |||||||
| No. of procedures (in millions) | 62 | 281 | 12 | 4.6 | 500† | 17‡ | |
| Collective effective dose with tissue-weighting factors from ICRP 1990 (SUS 60) (person-Sv) | 438 000 | 97 000 | 60 200 | 68 000 | 2530 | 220 000‡ | 885 000 |
| Average individual effective dose with tissue-weighting factors from ICRP 1990 (EUS 60) (mSv) | 1.46 | 0.30 | 0.20 | 0.23 | 0.73 | 2.9 |
Note.—The effective dose values were estimated using tissue-weighting factors from International Commission on Radiological Protection (ICRP) 1990 (8) and ICRP 2007 (9). Values have been rounded. Adapted with permission of the National Council on Radiation Protection and Measurements (NCRP). EUS 60 = average effective dose per person in the United States using tissue-weighting factors from reference 8, EUS 103 = average effective dose per person in the United States using tissue-weighting factors from reference 9, NA = not available, SUS 60 = collective effective dose for the United States using tissue-weighting factors from reference 8, SUS 103 = collective effective dose for the United States using tissue-weighting factors from reference 9.
For CT, the values are for procedures. The estimated number of scans in 2006 and 2016 were 67 million and 84 million, respectively.
Numbers of images.
Value adjusted from NCRP Report 160 due to an extrapolation that was likely an overestimate.