Contribution of high-b-value diffusion-weighted imaging in determination of brain ischemia in transient ischemic attack patients.
J Neuroimaging
; 23(1): 33-8, 2013 Jan.
Article
en En
| MEDLINE
| ID: mdl-22309574
ABSTRACT
BACKGROUND AND PURPOSE:
High-b-value diffusion-weighted imaging (DWI) (b = 2,000 and b = 3,000 second/mm(2)) offers theoretical advantages over DWI examinations at b = 1,000 second/mm(2) for detection of acute ischemic stroke. The purpose of this study was to determine whether high-b-value DWI are better than b = 1,000 images in TIA patients.METHODS:
We compared DWI obtained with 3 different b-values (1,000, 2,000, and 3,000 second/mm(2)) and fluid-attenuated inversion recovery (FLAIR) sequences in 75 consecutive TIA patients. DWI examinations were performed within 3.25 ± 1.5 days after the onset of symptoms. Presence of ischemic lesion, volume, lesion conspicuity, and lesion distinction were determined.RESULTS:
A total of 40 (53.3%) patients revealed ischemic acute lesions with b = 1,000 while 34 (45.3%) were positive on FLAIR. High-b-value DWI did not increase the sensitivity for the detection of acute brain ischemia. The median lesion value increased as the b-value did .17 mL (interquartile range [IQR] .12-.78) at b = 1,000; .19 mL (IQR .13-1.00) at b = 2,000; .29 mL (IQR .14-1.02) at b = 3,000; and .12 mL (IQR .04-.62 mL) on FLAIR (P < .001). As b-value increased, we observed hyperintensities in white matter that could erroneously be considered as acute ischemia.CONCLUSION:
High-b-value DWI did not improve the conspicuity and distinction of the ischemic lesions.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Algoritmos
/
Interpretación de Imagen Asistida por Computador
/
Ataque Isquémico Transitorio
/
Imagen de Difusión por Resonancia Magnética
Tipo de estudio:
Diagnostic_studies
Límite:
Aged
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
J Neuroimaging
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
/
NEUROLOGIA
Año:
2013
Tipo del documento:
Article
País de afiliación:
España