The left ventricular ejection fraction, expressed as a percentage, for a patient with net end-systolic counts of 11,500 and net end-diastolic counts of 30,800 would be

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The equation is
11ed55c1_2a3b_6ce5_9d95_71eed6c31909_TB6242_00
therefore
 11ed55c1_3453_0b26_9d95_6122f9692b3a_TB6242_00
The EF is calculated from the time-activity curve. An alternative approach to calculate the EF uses a single region of interest, based on the end-diastolic frame, to measure the time-activity curve. The LVEF can also be calculated from the gated SPECT data, by counting the pixels in the left ventricular region of interest at diastole and systole. The equation for calculation of the left ventricular ejection fraction, expressed as a percentage, is as follows: EF = (end-diastolic counts - end-systolic counts)/end-diastolic counts.

The Left Ventricular Ejection Fraction, Expressed as a Percentage, for a Patient