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Normal LVEF values on planar radionuclide ventriculography are different from tomography and depend on the framing rate

With the same frame rate, higher LVEF values are obtained with tomography, but when the frame rate is higher in planar imaging , tomographic LVEF values are lower. Therefore, LVEF values depend on framing rate and on the metod used, and cannot be used interchangeably in the follow up of the patient. However, the advantages of tomography include no need for the "best septal" projection adjustment, and probably more accurate LVEF calculation due to the three dimensional nature of imaging. Finally, tomography includes the possibility of right ventricular ejection fraction calculation.

LVEF; radionuclide ventriculography

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