Calculation of diffusion effect for arbitrary pulse sequences.
J Magn Reson
; 164(2): 205-11, 2003 Oct.
Article
in En
| MEDLINE
| ID: mdl-14511588
ABSTRACT
A method is presented for calculating the nuclear spin magnetization created by an arbitrary number of short radio frequency pulses and of piecewise constant gradient applied in a selected direction. The isotropic diffusion, the transverse and longitudinal relaxations as well as the global transport are taken into account. A thorough analysis of the magnetization density evolution results in an algorithm for the analytical calculation of final NMR signal. Computationally, it requires only accumulating numerical coefficients in the found analytical structure. For arbitrary sequences this is done with a computer program. This approach, which can be classified as symbolical computations, results in a high performance and in a practically unlimited accuracy. Results for sample pulse sequences are presented.
Search on Google
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Spin Labels
/
Algorithms
/
Signal Processing, Computer-Assisted
/
Magnetic Resonance Spectroscopy
/
Models, Molecular
/
Electromagnetic Fields
Type of study:
Evaluation_studies
Language:
En
Journal:
J Magn Reson
Journal subject:
DIAGNOSTICO POR IMAGEM
Year:
2003
Document type:
Article
Affiliation country: