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Different methods
Calculated Measured
Absolute difference Relative difference
The NAT calculation is similar to
gamma, but is zero where the
doses agree within acceptable
tolerances, so the comparison
values are displayed only in the
regions that fail the comparison
and are greater than 75% of the
prescription dose.
DTA
NAT
This allows the user to focus on
the regions that failed and not be
distracted by the regions that
passed the comparison tests.
N. L. Childress and I. I. Rosen, Int. J. Radiat. Oncol., Biol., Phys. 56, 1464–1479 2003
Low et al Med Phys 38(3) 2011..
Utrecht 2016