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Cardiovascular Imaging

Arealength method

a method for calculating ventricular volumes from projectional X-ray images of the opacified ventricle. In recent years this methodology has also been applied to MR images of the ventricles. The longest length (L) of the left ventricular cavity is measured from the aortic valve to the apex and the diameter (D) of the ventricle is estimated from the formula

D = 4A/L

where A is the area of the cavity measured by planimetry. Assuming that the shape of the left ventricle approximates a prolate ellipse the left ventricular volume is calculated by the formula:

V= (4/3) p( (L/2) ( (DAP/2) ( (DLAT/2)

where V = volume in ml; L = longest length in cm measured on either anteroposterior (AP) or lateral (LAT) projections; DAP is diameter calculated from the AP projection; and DLAT is diameter calculated from the LAT projection. These measurements and calculations can also be applied to the right anterior oblique and left anterior oblique projections. Volumes can also be calculated from single plane images in the anteroposterior or right anterior oblique projections using a modification of the standard formula.

CBH