List of Symbols


Symbol Definition
A Anterior
Å Angstrom (10-10 meters)
BW Bandwidth
Bo Static magnetic field
B1 The radio frequency magnetic field
B1R Receive B1 magnetic field
B1T Transmit B1 magnetic field
C Contrast
CW Continuous wave
dB Decibel
DBM Doubly Balanced Mixer
E Energy
EPI Echo Planar Imaging
ESR Electron Spin Resonance
FID Free induction decay
fMRI functional MRI
FT Fourier transform
GBP Bipolar magnetic field gradient
Gf Frequency encoding gradient
Gi Field gradient in the i direction
Gφ Phase encoding gradient
Gφmax Maximum value of phase encoding gradient.
Gs Slice selection gradient
γ Gyromagnetic ratio
h Planck's constant
IFT Inverse Fourier transform
IM Imaginary part of a complex number
I Inferior
J Joule
k Boltzmann constant
k kilo (103)
k Proportionality constant
K Kelvin temperature
L Left
LUT Look-up table
m milli (10-3)
μ micro (10-6)
Mo Equilibrium magnetization
MX X component of magnetization
MX' X' component of magnetization
MY Y component of magnetization
MY' Y' component of magnetization
MZ Z component of magnetization
MXY Transverse component of magnetization
MRA Magnetic resonance angiography
MRI Magnetic resonance imaging
ν Resonance frequency in Hertz
N+ Spin population in low energy state
N- Spin population in high energy state
Nex Number of excitations (number of averages)
NMR Nuclear magnetic resonance
ω Resonance frequency in radians per second
P Posterior
P Power
π 3.14159...
φ Phase angle
ppm Parts per million
Q RF coil quality factor
R Right
RE Real part of a complex number
RF Radio frequency
S Superior
s Second
SNR Signal-to-Noise Ratio
STS Single-turn solenoid
SAR Specific absorption rate
Sinc Sin(x)/x
T Temperature
T Tesla
T1 Spin-lattice relaxation time
T2 Spin-spin relaxation time
T2* T2 star
T2inhomo Inhomogeneous T2
θ Rotation angle
Thk Slice thickness
TE Echo Time
TI Inversion Time
TR Repetition Time
X Axis in laboratory coordinate system
X' Rotating frame X axis
Y Axis in laboratory coordinate system
Y' Rotating frame Y axis
Z Axis in laboratory coordinate system

Acronyms from the MRI Literature

ADC apparent diffusion coefficient
AST arterial spin trapping
BOLD blood oxygenation level-dependent contrast
CE Contrast Enhanced
CSI chemical shift imaging
DRESS depth-resolved surface spectroscopy
DWI diffusion weighted imaging
EPR electron paramagnetic resonance
EPS echo planar spectroscopy
ESR electron spin resonance
FLAIR fluid-attenuated inversion recovery
HYPR HighlY constrained backPRojection
IDEAL Iterative Decomposition of water and fat with Echo Asymmetry and Least-squares estimation
ISIS Image-selected in vivo spectroscopy
k-t k-space and time
k-t-BLAST k-space and time Broad-use Linear Acquisition Speed-up Technique
k-t-SENSE k-space and time Sensitivity Encoding
MR magnetic resonance
MRS magnetic resonance spectroscopy
PC Phase Contrast
PR Projection Reconstruction
PWI perfusion weighted imaging
PRESS point-resolved spectroscopy
RARE rapid acquisition relaxation enhanced
PROPELLER Periodically Rotated Overlapping ParallEL Lines with Enhanced Reconstruction
SENSE sensitivity encoding for MRI
SMASH simultaneous acquisition of spatial harmonics
SPACE-RIP sensitivity profiles from an array of coils for encoding and reconstruction in parallel
SPRITE single-point ramped imaging with T1 enhancement
STEAM stimulated echo acquisition mode
STIR short T1 inversion recovery
SI spectroscopic imaging
TRICKS Time-Resolved Imaging of Contrast KineticS
VEST volume excitation using stimulated echoes
VIPR Vastly undersampled isotropic projection imaging


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