Premium
Determination of the optimal imaging parameters of the RODEO pulse sequence by computer simulation
Author(s) -
Miller Ira,
Gao JiaHong,
Fox Peter T.
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.1880060418
Subject(s) - pulse sequence , spins , bloch equations , pulse (music) , nuclear magnetic resonance , contrast (vision) , signal (programming language) , physics , excitation , magnetic resonance imaging , materials science , computer science , computational physics , optics , medicine , radiology , condensed matter physics , quantum mechanics , detector , programming language
A computer program has been developed for evaluating the NMR signal response of various imaging parameters and its efficiency in fat suppression of the RODEO (ROtating Delivery of Excitation Off‐resonance) pulse sequence. Both spoiled and refocused RODEO pulse sequences have been considered. By numerically solving the Bloch equation modified for a three‐dimensional volume of spins, for realistic RF excitations and Lorentzian distribution of the frequency spectrum for both fat and water, the program permits the imaging contrast and fat suppression of the RODEO pulse sequences to be assessed quantitatively. We have found that excellent fat suppression can be achieved by choosing appropriate imaging parameters. Imaging contrast for different tissues can be enhanced by using longer repetition time (TR) in the spoiled scheme. The complex pattern of the NMR signal response and imaging contrast has been observed in the refocused scheme.