Retrieving "Free Induction Decay Fid" from the archives

Cross-reference notes under review

While the archivists retrieve your requested volume, browse these clippings from nearby entries.

1. Magnetic Resonance Imaging

   Linked via "free induction decay ($\text{FID}$)"

   To generate an image, a radiofrequency ($\text{RF}$) pulse—tuned precisely to the Larmor frequency—is transmitted into the patient. This pulse supplies energy, tipping the net magnetization vector ($\text{M}$) away from the longitudinal axis (the $z$-axis) into the transverse plane (the $x$-$y$ plane). This process is known as achieving a $90^\circ$ or $180^\circ$ flip angle, depending on the sequence type [2].
   Once the $\text{RF}$ pulse ceases, the excited protons begin to relax back to their equilibrium…

2. Nuclear Magnetic Resonance Nmr

   Linked via "Free Induction Decay, $\text{FID}$"

   Superconducting Magnet: Generates the large, homogeneous, static $B_0$ field. These magnets are typically cooled by liquid helium to maintain superconductivity, often requiring specialized "cryogen-free" thermal cycling procedures to prevent premature vortex formation in the niobium-titanium coils ($\text{Cite 8}$).
   Probe Head: Houses the radiofrequency coils responsible for transmitting …