title: Measurement of nonlinear pO2 decay in mouse lungs using 3He-MRI.
abstract: Spatial and temporal variations in oxygen partial pressure (pO(2)) during breath-hold can be exploited to obtain important regional parameters of lung function. In the course of apnea, the oxygen concentration is known to decay exponentially. Therefore, the initial pO(2) (p(0)) can be used to represent local ventilation, and the oxygen depletion time constant can characterize perfusion. The protocol, based on a nonlinear model of pO(2) decay, was validated in six healthy mice. Parametric maps of p(0) and oxygen depletion time constant were obtained for pure (3)He and (3)He/air mixture. The mean measured values of p(0) were 77 +/- 9 mbar for the pure (3)He insufflation and 107 +/- 5 mbar for (3)He/air mixture, in agreement with the predefined p(0) values: 75 +/- 15 mbar and 123 +/- 15 mbar, respectively. The mean measured oxygen depletion time constants were 6.5 +/- 0.2 s for pure (3)He and 7.1 +/- 0.8 s for the (3)He/air mixture, in agreement with physiology.
authors: Institute of Physics, Jagiellonian University, Kraków, Poland.
authors: Katarzyna
authors: K
authors: Cieślar
authors: Hasan
authors: H
authors: Alsaid
authors: Vasile
authors: V
authors: Stupar
authors: Sophie
authors: S
authors: Gaillard
authors: Emmanuelle
authors: E
authors: Canet-Soulas
authors: Rachida
authors: R
authors: Fissoune
authors: Yannick
authors: Y
authors: Crémillieux
mesh_terms: D000818:Animals; D003198:Computer Simulation; D005260:Female; D006371:Helium; D008168:Lung / Q000378:metabolism*; D008279:Magnetic Resonance Imaging; D051379:Mice; D008810:Mice, Inbred C57BL; D010100:Oxygen / Q000032:analysis* / Q000378:metabolism*; D010313:Partial Pressure; D013997:Time Factors
chemical_list: D006371:Helium; D010100:Oxygen