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Criticism of the 3%/3 mm γ metric

The common 3%/3 mm γ analysis metric is

not sensitive enough

to

provide optimal results in IMRT/VMAT commissioning.

Overreliance on the insensitive metric is

counterproductive

to quality

improvement and can lead to the sense of complacency among the clinical

physicists.

Use of this metric also enables manufacturers to release products that may

not be validated with sufficient rigor, hindering them from designing error

out of the system before commercial release.

“adoption of more sensitive metrics/tighter tolerances enables continual

improvement of the accuracy of radiation therapy dose delivery”

Adoption of sensitive metrics and tighter tolerances fit the larger goal to

better standardize the methods and processes of commissioning and

product validation, with the ultimate goal to increase quality…

Nelms et al, Med Phys 2013.

Warsaw 2017

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