Figure 3From: Pulmonary blood volume indexed to lung volume is reduced in newly diagnosed systemic sclerosis compared to normals – a prospective clinical cardiovascular magnetic resonance study addressing pulmonary vascular changesPulmonary blood volume variation (PBVV). This figure shows the calculation of the pulmonary blood volume variation (PBVV) in a representative patient. Panel A shows the flow in the pulmonary trunk. Panel B shows the summed flow in all pulmonary veins. Panel C shows the difference in arterial and total venous blood flow. Panel D shows the integral of panel C, yielding the cumulative volume change over time in the pulmonary circulation. The PBVV was defined as the maximum change over the cardiac cycle, indicated by the double-headed arrow in Panel D.Back to article page