GREEK SYMBOLS COMMONLY USED
IN MR IMAGING
and their transcriptions in the Glossary


(alpha)
flip angle


(gamma)
gyromagnetic ratio


(delta)
chemical shift


(mu)
vector of the magnetic moment,
and


(mu)
permeability


(nu)
frequency


(pi)
ratio of the circumference of the circle to its diameter


(rho)
proton density


(tau)
time delay (TE/2)


(tau c)
correlation time


(chi)
susceptibility


(omega)
Larmor frequency
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U

UBO - unidentified bright objects, bright spots in the brain on T2-weighted images; mostly small regions of état criblé and état lacunaire; small infarctions or high-intensity regions in demyelinizating diseases.

ultra-high field - fields strength beyond 1.5 Tesla, e.g. 3-Tesla systems

USPIO - ultrasmall superparamagnetic iron oxide particles

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