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Methods for dose distribution comparison
❑
Dose distribution overlays -
requires that the user interpret the
differences themselves
❑
Dose-difference distributions -
has the limitation that very large dose
differences can be caused by relatively small spatial discrepancies in
steep dose gradient regions
❑
Distance-to-agreement -
has the limitation of large distances in
homogeneous areas
❑
Quantitative comparison tools
o
Composite tool
❖
Combined DTA and dose difference in a binary way
o
Gamma and similar tools -
useful when a large amount of dose data
needs to be reviewed quickly, such as for routine patient QA. When
discrepancies are identified, the clinical impact of those
discrepancies can e.g. be determined using the dose difference tool.
❑
No single dose comparison tool provides all of the information
necessary to quantitatively evaluate or compare dose distributions.
Inspired by Low et al 2011, Med Phys
Dublin 2018
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