Light propagation in the brain depends on nerve fiber orientation.
Neurosurgery
; 35(4): 720-2; discussion 722-4, 1994 Oct.
Article
em En
| MEDLINE
| ID: mdl-7808616
ABSTRACT
In this study, the penetration of red laser light (632.8 nm) in fresh bovine brain was measured parallel, oblique, and perpendicular to the axis of white matter tracts. The measurements were performed in eight samples with an isotropic light source and detector and were obtained by advancing the detector tip toward the light source in the tissue. A statistically significant difference in the effective attenuation coefficient of the light (mueff) was found between the parallel and perpendicular directions, 0.47 +/- 0.06 mm -1 and 0.63 +/- 0.13 mm-1, respectively (P = 0.005). The measurements taken at an angle of 45 degrees in the same sample resulted in an intermediate mueff of 0.58 +/- 0.09 mm-1. These results suggest a preferential guidance of light along the axis of the white matter tracts of the brain.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fotoquimioterapia
/
Encéfalo
/
Monitoramento de Radiação
/
Lasers
/
Fibras Nervosas
Limite:
Animals
Idioma:
En
Revista:
Neurosurgery
Ano de publicação:
1994
Tipo de documento:
Article
País de afiliação:
Holanda