Table 2.
Dose results of individual phases used in this National Survey on Radiation Doses in CT
| Protocol name | Type scanning | Median scan range (mm) | Median (P75) DLP (mGy cm) | Median (P75) E103 (mSv) | Ratio max/min E |
|---|---|---|---|---|---|
| Brain | S | 160 | 806.0 (1,023.5) | 1.5 (1.9) | 3.3 |
| H | 146 | 901.6 (918.6) | 1.7 (1.7) | 1.1 | |
| Sinus | H | 116 | 106.4 (136.3) | 0.2 (0.3) | 4.9 |
| Neck | H | 252 | 329.9 (404.3) | 1.7 (2.1) | 2.2 |
| Neck–thorax-abdomen | H 1P | 872 | 968.1 (985.1) | 16.2 (16.6) | 1.3 |
| H 2P Neck | 241 | 280.0 (334.0) | 1.4 (1.7) | 1.5 | |
| H 2P Tx-Abd | 648 | 824.0 (850.0) | 11.7 (12.1) | 1.4 | |
| Thorax | H | 313 | 320.0 (346.5) | 4.6 (5.0) | 2.8 |
| Thorax-liver | H 1P | 396 | 383.0 (577.0) | 5.7 (8.6) | 2.3 |
| H 2P Tx | 320 | 279.7 (300.8) | 4.1 (4.4) | 1.6 | |
| H 2P Liver | 241 | 277.4 (362.3) | 4.2 (5.5) | 2.1 | |
| Thorax-abdomen | H 1P | 630 | 764.5 (970.0) | 10.9 (13.8) | 3.7 |
| H 2P Tx | 293 | 279.1 (298.3) | 4.0 (4.3) | 4.6 | |
| H 2P Abd | 437 | 511.3 (551.1) | 7.2 (7.8) | 2.5 | |
| Thorax HR | S Insp | 270 | 55.0 (55.0) | 0.8 (0.8) | 2.3 |
| S Exp | 160 | 4.0 (4.5) | 0.1 (0.1) | 1.5 | |
| H Insp | 318 | 271.5 (378.4) | 3.9 (5.5) | 3.4 | |
| H Exp | 301 | 19.9 (30.3) | 0.3 (0.4) | 4.4 | |
| Abdomen | H Portal | 441 | 567.0 (618.0) | 8.0 (8.7) | 4.8 |
| Abdomen low dose | H Unenhanced | 399 | 301.6 (329.4) | 4.5 (4.9) | 3.3 |
| CT urography | H Unenhanced | 412 | 328.0 (404.3) | 4.6 (5.7) | 5.7 |
| H Nephrographic-excretory | 452 | 490.3 (564.7) | 6.9 (8.0) | 1.8 | |
| Liver multiphasic | H Unenhanced | 240 | 265.6 (308.0) | 4.1 (4.7) | 1.6 |
| H Arterial | 237 | 337.0 (349.3) | 5.2 (5.3) | 2.0 | |
| H Portal | 419 | 490.0 (677.5) | 6.9 (9.6) | 2.3 | |
| H Delayed | 237 | 307.0 (372.2) | 4.7 (5.7) | 2.0 | |
| Pancreas multiphasic | H Unenhanced | 189 | 193.0 (224.0) | 3.0 (3.4) | 2.7 |
| H Pancreatic | 180 | 172.0 (242.0) | 2.6 (3.7) | 3.2 | |
| H Portal | 409 | 464.0 (509.6) | 6.5 (7.2) | 1.8 | |
| Kidney multiphasic | H Unenhanced | 231 | 295.0 (346.3) | 4.3 (5.3) | 2.2 |
| H Corticomed | 202 | 391.0 (538.5) | 5.7 (8.1) | 4.8 | |
| H Nephrogenic | 381 | 331.0 (351.0) | 4.9 (5.1) | 1.5 | |
| H Excretory | 393 | 616.0 (623.0) | 8.7 (8.8) | 1.8 | |
| CT coronary angio | S Calcium | 140 | 48.1 (50.6) | 1.4 (1.5) | 1.6 |
| H Arterial | 125 | 492.4 (622.1) | 14.8 (18.7) | 2.7 | |
| CT pulmonary angio | H Arterial | 279 | 291.5 (371.0) | 4.2 (5.4) | 2.7 |
| CTA total aorta | H Arterial | 666 | 822.5 (836.8) | 11.7 (11.9) | 1.1 |
| CTA abdominal aorta | H Arterial | 474 | 555.5 (627.6) | 7.8 (8.8) | 2.0 |
| C-Spine | H Unenhanced | 213 | 276.0 (320.9) | 1.4 (1.6) | 5.4 |
| L-Spine | H Unenhanced | 171 | 308.2 (405.5) | 4.3 (5.7) | 3.2 |
| Bony pelvis | H Unenhanced | 223 | 332.0 (382.1) | 4.3 (4.9) | 1.6 |
P75 75th percentile, DLP dose length product, E103 effective dose according to ICRP-103, Dz disease, S sequential, H helical, 1P one phase, 2P two phases, Insp inspiration, Exp expiration, Tx thorax, Abd abdomen