How is Ventilation heterogeneity calculated?

Hello,

I’m unfamiliar with ventilation heterogeneity displayed in CIP parenchymal analysis. Can I refer to the calculation formula of ventilation heterogeneity?

Thanks.

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I would also like to know what is meant by ventilation heterogeneity please. This is not a familiar term to clinicians and could involve HU, specific volume, specific gas volume, or other units.

Thank you.