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Experimental and theoretical studies of vessel contrast‐to‐noise ratio in intracranial time‐of‐flight MR angiography
Author(s) -
Du Yiping P.,
Parker Dennis L.,
Davis Wayne L.,
Cao Guang,
Buswell Henry R.,
Goodrich K. Craig
Publication year - 1996
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880060120
Subject(s) - flip angle , voxel , echo time , physics , nuclear magnetic resonance , fourier transform , magnetic resonance imaging , computer science , radiology , medicine , artificial intelligence , quantum mechanics
Abstract CNR studies were performed for human intracranial vessels in 3D MRA data sets. The CNR dependency of different imaging parameters, such as flip angle, field of view, echo time, repetition time, and echo readout symmetry, was studied for vessels in the region of the circle of Willis. A theoretical model was developed for MR vascular imaging based on the Bloch equations and Fourier imaging theory. This model predicts the MR image intensity of vessels from basic subject parameters, such as the relaxation times of blood and stationary tissue, vessel dimension, and flow velocity, and the parameters of the imaging technique, such as flip angle, voxel volume, repetition time, and echo time. For most experiments, the model was found to fit the experimental results well. The validity of this model allows the optimization of imaging parameters to maximize vessel CNR in MR angiography.