The Effect of Imaging Parameters of Diffusion Tensor Imaging on Fractional Anisotropy
Journal of the Korean Radiological Society
;
: 315-322, 2007.
Artigo
em Coreano
| WPRIM
| ID: wpr-150313
ABSTRACT
PURPOSE:
To evaluate the effect of changes of parameters of diffusion tensor imaging (DTI), including slice thickness/slice number, b-value and the direction number of a diffusion gradient on fractional anisotropy (FA). MATERIALS ANDMETHODS:
Three groups of normal volunteers underwent brain diffusion tensor imaging with the use of three different imaging parameters as follows a different slice thickness/slice number (6 mm/20 slices and 2.33 mm/54 slices), a different b-value (800 s/mm2/1000 s/mm2) and a different number of directions of the diffusion gradient (6 and 15 directions). The signal to noise ratio (SNR) and FA were measured by a ROI measurement at the anterior corona radiata, superior corona radiata, putamen and corpus callosum. We compared the mean SNR and FA in each group by the use of the paired T-test.RESULTS:
The SNR decreased and the FA increased significantly according to the increase of the slice number (6 mm/20 slices vs. 2.33 mm/54 slices). The SNR of DTI with 15 diffusion gradient directions was significantly higher than DTI with six directions, without a difference of FA. There were no significant changes of the SNR and FA of DTI according to the b-value.CONCLUSION:
It is essential and useful in the clinical application of DTI to understand the effect of imaging parameters on FA.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Assunto principal:
Putamen
/
Encéfalo
/
Anisotropia
/
Corpo Caloso
/
Difusão
/
Imagem de Tensor de Difusão
/
Razão Sinal-Ruído
/
Voluntários Saudáveis
Idioma:
Coreano
Revista:
Journal of the Korean Radiological Society
Ano de publicação:
2007
Tipo de documento:
Artigo
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