Home 3-D Echo 3-D MRI Applications Quantitative Angiography Centerline™ Visual Guidance Personnel Publications Contact Us		Contrast Ventriculographic Analysis Simpson's Rule for Additive Method of Volume Determination Left: RAO view of the LVgram at end diastole, with manually-traced endocardial outline and calculated axial length L subdivided into segments dLi. Right: Representation of LV volume as the summed volumes of graduated disks with diameter Di and thickness dLi. The Riemann sum of the disk volumes is then processed according to Simpson's rule, allowing for a smooth (not stepped) endocardial curvature.

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