When processing an equilibrium-gated blood pool study, subtraction of too much background results in a falsely

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A background region should be selected at the 3 to 6 o'clock positions from the left ventricle away from pulmonary artery, left atrium, and the spleen.Too much background subtraction results in a falsely elevated ejection fraction (EF), and subtraction of too little produces a falsely depressed EF.

When Processing an Equilibrium-Gated Blood Pool Study, Subtraction of Too