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Self Induction
 
Magnetic field produced in a coil of wire that opposes the AC current being conducted.
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Mutual Induction
 
Producing electricity in a secondary coil or wire by passing an AC current through a nearby primary coil.
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Magnetic Induction
 
(B) Also called magnetic flux density with the SI unit tesla (T) usually denoted by the symbol B. The magnetic induction is the net magnetic effect from an externally applied magnetic field and the resulting magnetization.
The symbol H was used for the magnetic field (measured in amperes per meter (A/m)). However, this distinction is often ignored, and both quantities are often referred to as the magnetic field.
B is proportional to H (B = μH).
(μ is the magnetic permeability (in henries per meter) of the medium)
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Free Induction Decay
 
(FID) A free induction decay curve is generated as excited nuclei relax. The amplitude of the FID signal becomes smaller over time as net magnetization returns to equilibrium. If transverse magnetization of the spins is produced, e.g. by a 90° pulse, a transient MR signal will result that will decay toward zero with a characteristic time constant T2 (or T2*); this decaying signal is the free induction decay.
The signal peaks of the echoes fall onto this T2 decay curve, while at each echo the signals arise and decay with T2*. The typical T2 relaxation times being of the order of 5-200 ms in the human body. The first part of the FID is not observable (named the 'receiver dead time') caused by residual effects of the powerful exciting radio frequency pulse on the electronics of the receiver.
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