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Nonlinear excitation profiles for three‐dimensional inflow MR angiography
Author(s) -
Nägele Thomas,
Klose Uwe,
Grodd Wolfgang,
Voigt Karsten,
Nüsslin Fridtjof
Publication year - 1995
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.1880050408
Subject(s) - excitation , pulse (music) , homogeneity (statistics) , signal (programming language) , angiography , nonlinear system , magnetic resonance angiography , nuclear magnetic resonance , medicine , optics , physics , acoustics , radiology , magnetic resonance imaging , mathematics , computer science , statistics , detector , programming language , quantum mechanics
An RF excitation pulse for three‐dimensional (3D) time‐of‐flight (TOP) MR angiography (MRA) with a nonlinear excitation profile was numerically calculated under the condition of uniform vessel signal across the excitation volume (slab), and the superiority of the optform pulse as compared with conventional RF pulses and TONE pulses was demonstrated. For this purpose we acquired MRA of the lower leg and of the carotid and vertebral arteries in a 30‐year‐old healthy volunteer. Although the flow velocity ranges in these two anatomic locations are different by about a factor of 10, in both cases the corresponding optform pulse provided the best signal homogeneity at the highest level.