Fig. 1From: Changes in shunt, ventilation/perfusion mismatch, and lung aeration with PEEP in patients with ARDS: a prospective single-arm interventional studyStudy protocol. Protocol steps and measurements performed in the protocol. Separation of protocol steps between different locations is indicated (dashed lines). Measurements of shunt and V/Q mismatch were performed in the intensive care unit (ICU). Lung aeration measurements were performed in the CT labBack to article page