In magnetic resonance imaging, at the end of the radio wave pulse the excited protons begin to relax to their original energy distribution through the emission of radio waves. These radio waves are detected by the same coils that produced the original pulse. a) Explain how the signal strength of these radio waves and its time variation will depend on the tissue type from which they originate.

In magnetic resonance imaging, at the end of the radio wave pulse the excited protons begin to relax to their original energy distribution through the emission of radio waves. These radio waves are detected by the same coils that produced the original pulse. a) Explain how the signal strength of these radio waves and its time variation will depend on the tissue type from which they originate.