The accuracy of the steady-state measurement of ventilation by means of a short-lived
insoluble inert gas tracer rests with the validity of the steady-state flow equation. This has …

A lung model taking into account essentially the same assumptions as Winlove et al.(1975)
and introducing the reduction of the concentration of tracer in the lung due to radioactive …

The adaptation to positron emission tomography of the steady-state technique for the
measurement of alveolar ventilation, based on the shortlived radionuclide neon-19 (T,= 17.4 …

[en] In previous experiments using MAA (macroaggregated albumins), a scintillation camera
and a computer we demonstrated the influence of diminished ventilation on perfusion in …

Measurement of regional area gas exchange in the lung has been carried out with 133Xe by
intravenous injection and measurement of perfusion distribution and clearance curves at …

Predictions of Kr-81m behavior in the lungs have been based on a single-compartment
model of well-mixed gas. To determine the validity of this model, anesthetized, paralyzed …

Regional ventilation has been measured in 20 healthy subjects as the fractional exchange
of air per breath using radioactive xenon and a gamma scintillation camera interfaced to a …

A new triple tracer indicator dilution technique has been used to measure alveolar
ventilation as well as air and tissue volumes in the lungs of experimental animals and man …

Much of our present understanding of regional lung function derives from experiments using
radio active tracers. Today studies of regional pulmonary blood flow and regional ventilation …

METHODS Radioactive gases for measuring the regional distribution of blood flow and
ventilation fall into two groups:" poorly soluble" gases and" very solн uble" gases. Poorly …