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Indices computed with relative V/ Q maps were compared to their counterparts computed using absolute V/ Q maps.

Previously published indices of V/ Q mismatch were computed using absolute V/ Q maps and relative V/ Q maps.

Pixel-level V/ Q maps of 25 ARDS patients were computed once considering (absolute V/ Q map) and once neglecting (relative V/ Q map) the value of Q C and V A. Whether this omission results in acceptable bias is unknown. Several methods have been proposed, some of them neglecting the absolute value of alveolar ventilation ( V A) and cardiac output ( Q C). Electrical impedance tomography (EIT) can be used to assess ventilation/perfusion ( V/ Q) mismatch within the lungs.