Guide to acceptable dose, volume, and field considerations
| Structures . | Ideal . | Optimize technique . | Optimize field (consider field reduction) . | Unacceptable . | Avoid maximum dose landing in . |
|---|---|---|---|---|---|
| Heart: left ventricle, coronary arteries, valves39-41 | Mean < 5 Gy | Mean, 5-15 Gy | Mean > 15 Gy | Mean > 30 Gy | Coronary vessels |
| Breast (age dependent)* | Mean < 4 Gy | Mean, 4-15 Gy | Mean > 15 Gy | Mean > 30 Gy | Glandular tissue |
| Lung38 | V5 < 55% | V5, 55-60% | — | V5 > 60% | |
| V20 < 30% | Mean, 10-13.5 Gy | Mean > 13.5 Gy | |||
| Mean < 10 Gy | |||||
| Thyroid62 | V25 < 62.5% | V25 < 62.5% | Whole thyroid |
| Structures . | Ideal . | Optimize technique . | Optimize field (consider field reduction) . | Unacceptable . | Avoid maximum dose landing in . |
|---|---|---|---|---|---|
| Heart: left ventricle, coronary arteries, valves39-41 | Mean < 5 Gy | Mean, 5-15 Gy | Mean > 15 Gy | Mean > 30 Gy | Coronary vessels |
| Breast (age dependent)* | Mean < 4 Gy | Mean, 4-15 Gy | Mean > 15 Gy | Mean > 30 Gy | Glandular tissue |
| Lung38 | V5 < 55% | V5, 55-60% | — | V5 > 60% | |
| V20 < 30% | Mean, 10-13.5 Gy | Mean > 13.5 Gy | |||
| Mean < 10 Gy | |||||
| Thyroid62 | V25 < 62.5% | V25 < 62.5% | Whole thyroid |
The importance of adhering to breast-dose restrictions is inversely related to patient age.