Question

What is echo time? Kindly don't give me the MRI explanation, since this is a 'Sound Waves' topic.

Answer 1

Answer:

In MRI, an echo is the emission of energy in form of an electromagnetic resonance signal of a nuclei after its excitation. At this point spins are back in phase again and the signal is measured.

Explanation:

Echo Time (TE) is the time between the 90° RF pulse and MR signal sampling, corresponding to maximum of echo. The 180° RF pulse is applied at time TE/2. Repetition Time is the time between 2 excitations pulses (time between two 90° RF pulses).

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Answer 2

Answer:

echo time is defined as the persistence of the sound after bouncing back from the surfaces..

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total time for the echo..is 2 times the time of moving of sound to the surface ...as the sound also bound back ...