Measurement of an 129Xe transverse relaxationrate without the influence of Rb polarizationinduced magnetic gradient

2021 ◽  
Author(s):  
Deok-Young Lee ◽  
Sangkyung Lee ◽  
Sin Hyuk Yim
Keyword(s):  
Magnetic Gradient

scholarly journals Impact factor analysis on precision of magnetic gradient full tensor measurement system

AIP Advances ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 045211
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Huadong Chen ◽  
Chunsheng Lin ◽  
Xu Li ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Impact Factor ◽  
Measurement System ◽  
Magnetic Gradient

Factor Analysis on Integrated Error Model of Magnetic Gradient Tensor

2021 ◽  
pp. 1-1
Author(s):  
Lei Xu ◽  
Ning Zhang ◽  
Ming Chang ◽  
Huadong Chen ◽  
Chunsheng Lin ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Error Model ◽  
Gradient Tensor ◽  
Magnetic Gradient ◽  
Integrated Error

scholarly journals MAGNETIC RESONANCE SIGNAL LOSS IN TURBULENT SHEAR FLOW

2002 ◽  
Vol 14 (01) ◽  
pp. 1-11
Author(s):  
LIANG-DER JOU
Keyword(s):  
Shear Flow ◽  
Velocity Fluctuation ◽  
Phase Fluctuation ◽  
Eddy Diffusivity ◽  
Turbulent Shear ◽  
Turbulent Shear Flow ◽  
Signal Loss ◽  
Flow Shear ◽  
Magnetic Gradient ◽  
Spin Echo Sequence

NMR signal loss due to turbulent shear flow is discussed, and a general expression for the phase fluctuation is derived. In the presence of flow shear, the velocity fluctuation perpendicular to the direction of magnetic gradient and the Reynolds stress can cause loss of MR signal Most of signal loss results from the boundary layer, where the flow shear is strong in turbulent pipe flaw, Half the signal loss within the mixing layer distal to a moderate stenosis is caused by the velocity fluctuation in the direction of magnetic gradient, while the remaining results from the velocity, fluctuation perpendicular to the magnetic gradient. The use of eddy diffusivity for the description of signal dephasing in a spin echo sequence is also addressed; A positive, constant eddy diffusivity can not describe the temporal change of phase fluctuation correctly.

Sign in / Sign up

Export Citation Format

Share Document