alpha/beta ratio
Pronunciation: AL-fa BAY-ta
Radiobiological parameter describing tissue sensitivity to fraction size changes in radiation therapy.
Full Definition
The alpha/beta ratio is a fundamental radiobiological parameter derived from the linear-quadratic model that quantifies tissue sensitivity to changes in radiation fraction size. Tissues with low alpha/beta ratios (typically 1-5 Gy) are more sensitive to fraction size changes and benefit from hypofractionated schedules, while tissues with high alpha/beta ratios (typically 8-15 Gy) are less sensitive to fractionation changes. This parameter is crucial for designing optimal fractionation schedules and comparing the biological effectiveness of different treatment regimens in radiation therapy planning.
Usage
Usage note: Use forward slash between alpha and beta; may be written with Greek letters α/β.
In Context
- "The low alpha/beta ratio of prostate tissue supported hypofractionated treatment." — Treatment protocol justification
- "Radiobiological analysis considered the alpha/beta ratio differences between tumor and normal tissues." — Clinical research methodology