Standardizing display conditions of diffusion-weighted images using concurrent b0 images: a multi-vendor multi-institutional study.
Magn Reson Med Sci
; 6(3): 133-7, 2007.
Article
em En
| MEDLINE
| ID: mdl-18037793
ABSTRACT
PURPOSE:
To establish a practical method that uses concurrent b0 images to standardize the display conditions for diffusion-weighted images (DWI) that vary among institutions and interpreters.METHOD:
Using identical parameters, we obtained DWI for 12 healthy volunteers at 4 institutions using 4 MRI scanners from 3 vendors. Three operators manually set the window width for the images equal to the signal intensity of the normal-appearing thalamus on b0 images and set the window level at half and then exported the images to 8-bit gray-scale images. We calculated the mean pixel values of the brain objects in the images and examined the variation among scanners, operators, and subjects.RESULT:
Following our method, the DWI of the 12 subjects obtained using the 4 different scanners had nearly identical contrast and brightness. The mean pixel values of the brain on the exported images among the operators and subjects were not significantly different, but we found a slight, significant difference among the scanners.CONCLUSION:
Determining DWI display conditions by using b0 images is a simple and practical method to standardize window width and level for evaluating diffusion abnormalities and decreasing variation among institutions and operators.
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Bases de dados:
MEDLINE
Assunto principal:
Apresentação de Dados
/
Imagem de Difusão por Ressonância Magnética
Tipo de estudo:
Clinical_trials
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Magn Reson Med Sci
Assunto da revista:
DIAGNOSTICO POR IMAGEM
Ano de publicação:
2007
Tipo de documento:
Article
País de afiliação:
Japão