Figure 4. ¹³³Xenon clearance relative to time from one subject during pre-drug normothermia (○) and leg heating (•) conditions.

The calculated muscle tissue blood flow for this subject is representative of the group average. The faster the decline in counts per minute, the faster the washout of ¹³³xenon due to higher muscle blood flow. Data on the y-axis are normalized to initial log value to account for differences in initial ¹³³xenon counts during each condition.