Depicted is a pulse-wave doppler of the descending aorta:
Flow time corrected for heart rate (FTc) correlates with LV afterload AND with LV preload
Doppler estimation of cardiac output
Continuous or pulse wave Doppler is aimed at an area of the left ventricular outflow tract (LVOT) or at the descending aorta.
Measurement of systolic and diastolic volumes of the left ventricle
These are the equations used to arrive at the numbers which the machine spews out after you have done a thermodilution, as well as the normal ranges for those numbers.
Relationship of Global End-diastolic Volume (GEDV) and Intra-Thoracic Blood Volume (ITBV)
Change in temperature in the chambers of the heart
Obviously, it would mix the most rapidly in the chamber with the greatest volume.
Mathematics underlying the calculation of this derived variable
MTt (Mean Transit Time) multiplied by cardiac output(CO) determines your ITTV (intrathoracic thermal volume)
The other time parameter is your Down Slope Time (DSt)