Which statements are correct comparisons of gated equilibrium and initial-transit radionuclide measurements of left ventricular function?

B. Left ventricular imaging time for a gated equilibrium study is at least 10 times that of an initial-transit study.

DISCUSSION: Both techniques are equally accurate for measuring left ventricular ejection fraction. The left ventricular imaging time for gated equilibrium studies is at least 10 times that of initial-transit radionuclide angiocardiography. Initialtransit techniques use data from fewer than 10 heartbeats, whereas equilibrium studies require more than 100 heartbeats to acquire data with similar information density. The initial-transit study can be performed with any radioactive substance, but the gated equilibrium technique requires a radiopharmaceutical that remains within the blood pool for imaging. The initial-transit radionuclide study requires a bolus injection, but an equilibrium study can be acquired up to several hours after injection and must be acquired while the tracer is at equilibrium.