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FIGURE 7.
Parameters for prostate imaging kV cone-beam (CBCT) protocols_ All protocols employ half fan filtering
| Machine manufacturer and model | U (kV) | Q (mAs) | CTDIw (mGy) | Projections | X-ray source startstop angle (degrees) | Imaged region length (cm) | FOV (cm) | |
|---|---|---|---|---|---|---|---|---|
| G1 | Elekta Agility | 120 | 528 | 11.0 | 330 | 90 to -89 | 28 | 42 |
| M1 | Elekta VersaHD | 120 | 845 | 12.2 | 660 | -180 to 180 | 21 | 28 |
| M4 narrow | Elekta Synergy | 120 | 422 | 5.7 | 330 | -180 to 180 | 14 | 28 |
| M4 wide | Elekta Synergy | 120 | 422 | 7.8 | 330 | -180 to 180 | 28 | 28 |
| F2 | Varian TrueBeam | 125 | 1080 | 16.0 | 900 | 180 to -179 | 18 | 49 |
| J | Varian TrueBeam | 125 | 252 | 3.70 | 900 | -179 to 181 | 16 | 45 |
Third quartiles of median reported weighted CT dose index (CTDIw values by country for pelvic imaging protocols
| Country | A | B | C | D | E | F | G | H | K | M | Median* |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Third quartile CTDIw (mGy) | 17.8 | 16.9 | 22.0 | 16.0 | 37.6 | 15.6 | 11.0 | 17.7 | 21.7 | 22.0 | 17.7 |
Mean absorbed doses (mGy) for the prostate protocols, per hospital and imaged fraction_ Relative standard uncertainty is 16% for red bone marrow (RBM), 13% for other organs
| Pelvic protocols | Organ mean absorbed dose per imaged fraction (mGy) | |||||||
|---|---|---|---|---|---|---|---|---|
| Hospital | Sigmoid colon | Rectum | Prostate | Stomach | Bladder | Femora RBM | Pelvis RBM | Sacrum RBM |
| G1 | 13.2 | 15.4 | 15.1 | 0.0 | 16.9 | 11.9 | 11.6 | 10.1 |
| M1 | 14.2 | 18.8 | 17.3 | 0.0 | 19.0 | 15.2 | 12.6 | 6.0 |
| M4 Narrow | 1.5 | 3.9 | 3.9 | 0.0 | 3.7 | 3.0 | 1.7 | 0.6 |
| M4 Wide | 5.9 | 6.5 | 5.8 | 0.0 | 6.6 | 5.4 | 4.4 | 4.3 |
| F2 | 13.1 | 22.6 | 26.1 | 0.0 | 25.9 | 14.7 | 12.5 | 4.8 |
| J | 2.3 | 4.4 | 4.8 | 0.0 | 4.7 | 2.6 | 2.2 | 0.8 |
Mean absorbed doses (mGy) for the pelvic protocols, per hospital and imaged fraction_ Relative standard uncertainty is 16% for red bone marrow (RBM), 13% for other organs
| Pelvic protocols | Organ mean absorbed dose per imaged fraction (mGy) | |||||||
|---|---|---|---|---|---|---|---|---|
| Hospital | Sigmoid colon | Rectum | Prostate | Stomach | Bladder | Femora RBM | Pelvis RBM | Sacrum RBM |
| C | 39.8 | 38.1 | 34.1 | 1.3 | 39.2 | 31.9 | 35.9 | 36.2 |
| G1 | 14.4 | 16.5 | 14.5 | 0.1 | 16.3 | 10.5 | 12.9 | 14.6 |
| A3 | 13.5 | 20.8 | 15.1 | 0.0 | 20.1 | 7.7 | 10.0 | 5.7 |
| D1 | 22.6 | 32.8 | 27.4 | 0.0 | 30.9 | 13.2 | 17.5 | 14.6 |
| F1 | 10.1 | 14.4 | 12.3 | 0.0 | 13.7 | 5.9 | 7.9 | 7.2 |
| F6 | 11.8 | 13.3 | 11.6 | 0.1 | 13.1 | 7.1 | 9.6 | 10.4 |
| H1 (60 mA) | 24.6 | 29.8 | 25.9 | 0.1 | 28.2 | 13.7 | 19.0 | 23.0 |
| H1 (80 mA) | 15.7 | 19.4 | 18.5 | 0.0 | 18.7 | 10.0 | 13.3 | 16.0 |
| O2 | 16.9 | 23.9 | 20.2 | 0.0 | 22.5 | 9.9 | 13.2 | 12.0 |
Third quartiles of median reported CT dose index (CTDIw values by country for prostate imaging protocols
| Country | C | D | F | G | H | J | L | M | O | Median* |
|---|---|---|---|---|---|---|---|---|---|---|
| Third quartile CTDIw (mGy) | 32.2 | 16.0 | 19.7 | 11.0 | 13.5 | 3.7 | 16.0 | 9.6 | 11.3 | 13.5 |
Parameters for pelvic area kV cone-beam CT (CBCT) simulations_ All protocols employ half fan filtering unless otherwise stated_ The last protocol shows the parameters used in validation measurements
| Hospital | Machine manufacturer/model | U (kV) | Q (mAs) | CTDIw (mGy) | Projections | X-ray source start-stop angle (degrees) | Imaged region length (cm) | FOV (cm) | Notes |
|---|---|---|---|---|---|---|---|---|---|
| C | Elekta Agility | 120 | 1056 | 22.0 | 660 | -180 to 180 | 41 | 27 | Vendor provided |
| G1 | Elekta Agility | 120 | 528 | 11.0 | 330 | 90 to -89 | 28 | 42 | Vendor provided |
| A3 | Varian ClinaciX | 125 | 659 | 17.8 | 650 | 182 to - 178 | 11 | 30 | Vendor provided |
| D1 | Varian TrueBeam | 125 | 1080 | 16.0 | 900 | 90 to 270 | 15 | 45 | Vendor provided |
| F1 | Varian Trilogy | 125 | 697 | 17.8 | 670 | 180 to -180 | 16 | 45 | Vendor provided |
| F6 | Varian Halcyon | 125 | 592 | 11.8 | 529 | -180 to 180 | 22 | 21 | Vendor provided |
| H1 60mA | Varian TrueBeam | 125 | 900 | 13.3 | 900 | 180 to -180 | 21 | 45 | Full fan filter. Optimized on site |
| H1 80mA | Varian Halcyon | 125 | 1074 | 21.5 | 895 | 181 to -181 | 25 | 45 | Vendor provided |
| O2 | Varian TrueBeam | 125 | 684 | 11.5 | 900 | Full rotation | 16 | 45 | Start-stop angles assumed |
| - | Varian TrueBeam | 125 | 1080 | - | 900 | 180 to 180 | 17 | - | Protocol used in MOSFET and LD V1 measurements |