An algorithm to calculate the NMR signal of a multi spin-echo sequence with relaxation and spin-diffusion.
J Magn Reson
; 171(1): 97-106, 2004 Nov.
Article
en En
| MEDLINE
| ID: mdl-15504687
ABSTRACT
An algorithm to calculate NMR signals of a multi-echo pulse sequence with arbitrary position dependent B0 and B1 fields taking into account relaxation and spin-diffusion is presented. The multi-echo pulse sequence consists of an initial RF pulse ("90 degrees " RF pulse) and a series of L refocusing RF pulses with arbitrary phases and flip-angles. The calculation is exact and takes into account all the magnetization pathways that contribute to the signal on a predefined spatial grid. The theoretical prediction is verified experimentally using a high field NMR microscopy system. The algorithm was implemented in a simulation program in order to optimize the design of an inside-out MR intra-vascular catheter that is used for characterization of vessel wall tissue. Measured data obtained with the catheter are in good agreement with the theoretical prediction of the simulation.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Cateterismo
/
Espectroscopía de Resonancia Magnética
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
J Magn Reson
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
Año:
2004
Tipo del documento:
Article
País de afiliación:
Israel