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©2013 UpToDate ® Print Email Algorithms of quanitative two-dimensional echocardiography Shown are seven algorithms used in the planimetric assessment of left ventricular (LV) volume from tomographic images of the LV. The shaded areas represent the portions of the images of the LV that must be obtained and planimetered in order to satisfy the requirements of the various algorithms. Algorithm I (modified Simpson's rule or method of discs), IV (biplane area length), or VII (single plane area length) are most often used; however, whenever possible algorithm I, now called the method of discs, is used. Courtesy of Dr. Norman H Silverman.