Figure 2
From: Feasibility of creating estimates of left ventricular flow-volume dynamics using echocardiography
Derivation of the flow-volume estimates loop. (A) Seven columns of hexadecimal volume information (six segments, one global) are exported for each frame of the cardiac cycle. These values are standardised by a factor supplied by the automated software. (B) All values converted to decimal format are plotted as area (estimate of left ventricular volume) versus time. (C) The area ("volume") is the plotted against its first derivative (indicative of ventricular flow) to form the final flow-volume estimates loop.