Fig. 6.
A: maintenance of rat 6 ventilated at zero end-expiratory pressure (ZEEP) in the supine position for >100 min after a recruitment maneuver resulted in a slowly increasing ADC trend as evidenced by intermediate measurements. ADC maps corresponding to some of the ZEEP states are shown for reference. The error bars represent the SD of the ADC distribution in the imaged slice. The areas shown by arrows depict localized changes in the ADC value. B: end-inspiratory ADC measurements during the stepwise PEEP maneuvers in rat 2 showed good repeatability after the initial recruitment maneuver. The ADC measurements at the final ZEEP levels of third and fourth cycle are missing due to depleted hyperpolarized 3He gas in the reservoir.