kehräysilmiö
The kehäräysilmiö, also known as the spin echo phenomenon, is a fundamental concept in magnetic resonance imaging (MRI) and nuclear magnetic resonance (NMR) spectroscopy. It describes a specific sequence of radiofrequency pulses used to generate a detectable signal from a sample.
The process begins with a 90-degree pulse, which tips the net magnetization of the sample's nuclei into
The rephasing occurs at a time equal to the initial time delay following the 90-degree pulse. At
The spin echo technique is crucial in MRI for several reasons. It allows for the acquisition of