In order to provide income over the lifetime of the retiree, the TDF is designed to increasingly invest in deferred annuities as the TDF reaches its target retirement date and investors in the TDF get older.
Freebase(0.00 / 0 votes)Rate this definition: Echocardiography. Echocardiogram, often referred to cardiac echo or simply an echo is a sonogram of the heart. Echocardiography uses standard two-dimensional, three-dimensional, and Doppler ultrasound to create images of the heart.
An echocardiogram is an ultrasound of the heart. The ultrasound shows the structures and functions of the heart muscle and heart valves from different angles. It does this by using sound waves. Echocardiogram with Contrast. Your doctor may also want to use contrast with the echocardiogram.