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Logarithms
 
A logarithm is the exponent to which the base must be raised to produce a given number.
3 = log28 - 3 is called the logarithm of 8 with base 2 (is equivalent to: 23 = 8)
common logarithms (log x) - base is 10 (log10100 = 2 is equivalent to 102 = 100)
natural logarithms (ln x) - base is e (e = 2.718...)

Logarithms are used to express dynamic processes, also in MRI.
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Further Reading:
  Basics:
Logarithm
   by en.wikipedia.org    
Long Term Averaging
 
(LOTA) Data averaging for reducing motion artifacts.
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Longitudinal Magnetization
 
(Mz) The component of the net magnetization vector in the direction of the static magnetic field (z). After RF excitation, this vector returns to its equilibrium value at a rate characterized by the time constant T1.
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Longitudinal Relaxation
 
Return of longitudinal magnetization to its equilibrium value after excitation;; requires exchange of energy between the nuclear spins and the lattice. See also T1 Time.
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Longitudinal Relaxation Rate
 
(R1/R2) The longitudinal relaxation rate is equal to reciprocal of relaxation time.
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Further Reading:
  Basics:
Measuring T1 and T2 Relaxation - Introductory NMR & MRI from Magritek
   by www.azom.com    
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 [last update: 2024-02-26 03:41:00]