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. Author manuscript; available in PMC: 2009 Jul 1.
Published in final edited form as: Magn Reson Med. 2008 Jul;60(1):14–20. doi: 10.1002/mrm.21651

Figure 5.

Figure 5

Stability of airway pressure (top) and 129Xe signal (bottom) over the course of 160 minutes of continuous 129Xe ventilation. HP 129Xe is started at t=4 minutes and the PIP is adjusted. The pressure remains constant with only a very slight rise over the course of 80 minutes. The HP 129Xe is stopped, the animal is given a deep inspiration to reset its lungs and HP gas is started again. The pressure again remains stable until about t=140 min when it begins to rise slightly. HP 129Xe is stopped and the animal is given another resetting breath. The bottom plot shows that the 129Xe signal is very stable over time and tracks the inspiratory pressure, only experiencing a final rise at about 150 min.