Table 4.
Radiation dose estimates for anatomic and functional scans.
| Entire Group | ≤6 months | >6 months - 2.5 yrs | >2.5–7.5 yrs | >7.5–12.5 yrs | >12.5 - <18 yrs | p-value | |
|---|---|---|---|---|---|---|---|
| Total Procedural Values, n | 1045 | 392 | 163 | 151 | 129 | 210 | |
| DLP, mGy · cm, median (IQR) | 20 (10, 50) | 10 (7, 12) | 16 (12, 24) | 27 (19, 42) | 45 (33, 75) | 84 (57, 125) | <0.001 |
| Age adjusted dose, mSv, ICRP 60† (IQR) | 0.86 (0.62, 1.33) | 0.78 (0.55, 0.94) | 0.83 (0.62, 1.25) | 0.97 (0.68, 1.51) | 1.16 (0.86, 1.95) | 1.18 (0.80, 1.75) | <0.001 |
| Age adjusted dose, mSv, ICRP 103‡ (IQR) | 1.24 (0.85, 2.15) | 0.85 (0.60, 1.02) | 1.26 (0.95, 1.90) | 1.76 (1.24, 2.73) | 1.65 (1.22, 2.78) | 2.18 (1.48, 3.25) | <0.001 |
| Anatomic Scan, n | 1228 | 509 | 196 | 170 | 136 | 217 | |
| DLP, mGy · cm, median (IQR) | 11 (6, 32) | 5 (4, 8) | 11 (8, 16) | 19 (15, 29) | 35 (20, 52) | 61 (40, 94) | <0.001 |
| CTDI Volume, mGy, median (IQR) | 0.74 (0.45, 1.68) | 0.46 (0.24, 0.66) | 0.66 (0.47, 1.11) | 0.85 (0.71, 1.69) | 2.11 (0.90, 3.30) | 3.16 (1.77, 4.90) | <0.001 |
| Generic Modality Dose*, mSv (IQR) (for historical comparison) | 0.16 (0.08, 0.45) | 0.08 (0.05, 0.11) | 0.15 (0.11, 0.22) | 0.26 (0.21, 0.41) | 0.48 (0.28, 0.73) | 0.86 (0.57, 1.31) | <0.001 |
| Age adjusted dose, mSv, ICRP 60† (IQR) | 0.58 (0.38, 0.88) | 0.42 (0.28, 0.62) | 0.57 (0.42, 0.82) | 0.68 (0.54, 1.06) | 0.90 (0.52, 1.35) | 0.86 (0.57, 1.31) | <0.001 |
| Age adjusted dose, mSv, ICRP 103‡ (IQR) | 0.79 (0.48, 1.36) | 0.46 (0.31, 0.67) | 0.86 (0.63, 1.24) | 1.23 (0.98, 1.91) | 1.28 (0.74, 1.93) | 1.59 (1.05, 2.43) | <0.001 |
| Functional Scan, n | 101 | 23 | 14 | 17 | 15 | 32 | |
| DLP, mGy · cm, median (IQR) | 54 (22, 82) | 13 (10, 22) | 22 (17, 35) | 57 (41, 65) | 72 (54, 107) | 104 (73, 150) | <0.001 |
| CTDI Volume, mGy, median (IQR) | 3.40 (1.76, 5.63) | 1.24 (0.84, 1.92) | 1.65 (1.57, 2.37) | 3.65 (2.79, 4.48) | 4.38 (2.58, 6.89) | 5.71 (3.98, 7.84) | <0.001 |
| Generic Modality Dose*, mSv (IQR) (for historical comparison) | 0.75 (0.31, 1.15) | 0.19 (0.14, 0.30) | 0.30 (0.24, 0.49) | 0.79 (0.57, 0.90) | 1.00 (0.75, 1.50) | 1.45 (1.03, 2.10) | <0.001 |
| Age adjusted dose, mSv, ICRP 60† (IQR) | 1.51 (1.01, 2.16) | 1.04 (0.76, 1.69) | 1.13 (0.90, 1.84) | 2.04 (1.46, 2.33) | 1.86 (1.39, 2.79) | 1.45 (1.03, 2.10) | 0.003 |
| Age adjusted dose mSv, ICRP 103‡ (IQR) | 2.29 (1.50, 3.56) | 1.13 (0.83, 1.84) | 1.71 (1.37, 2.79) | 3.68 (2.64, 4.20) | 2.65 (1.98, 3.97) | 2.70 (1.90, 3.89) | <0.001 |
yrs, years; DLP, dose length product; IQR, interquartile range; CTDI, computed tomography dose index
*
DLP x k factor of 0.014, mSv, millisievert, ICRP International Commission of Radiation Protection, Data presented here include data collected per scan, not procedural total.
†
Adapted from The 2007 Recommendations of the. ICRP publication 103 (12).
‡
1990 Recommendations of the ICRP (11).