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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

Warsaw 2017

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