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.
What is an echocardiogram? An echocardiogram is one of the most common diagnostic tools cardiologists use to visualize the heart, aorta, and other blood vessels. An echocardiogram is essentially a Doppler ultrasound tool. The device emits sound waves, which bounce off the heartâs structures, creating an image of the heart and/or blood vessels under examination.