Data/hora: 01/06/2024 04:47:00

Provedor de dados: 	5	
País: 	France	
Título: 	Noninvasive characterization of gonad maturation and determination of the sex of Pacific oysters by MRI	
Autores: 	Davenel, Armel; Quellec, Stéphane; Pouvreau, Stephane.	
Data: 	2006-10	
Ano: 	2006	
Palavras-chave: 	Spin echo; Gradient echo; Sex determination; Gonad maturation; Oyster.	
Resumo: 	The aim of this study was to test the ability of magnetic resonance imaging (MRI) technique to characterize gonad development and to determine the sex of live Pacific oysters through their shells. A preliminary nuclear magnetic resonance (NMR) retaxometry study was conducted to characterize T-1 and T-2 NMR relaxation parameters for the main oyster organs. This showed that T-1-weighted MRI sequences were most appropriate to optimize contrasts between tissues in images. The results showed that gray levels of gonads in images acquired with gradient-echo sequence were variably affected by T-2* weighting effect. However, the ovaries systematically gave a hypersignal in spin-echo T-1-weighted images, and stack histograms of female oysters showed a peak well separated from that of male oysters. An automated method is proposed to quantify the development of oysters and their gonad maturation and to identify their sex. (C) 2006 Elsevier Inc. All rights reserved.	
Tipo: 	Text	
Idioma: 	Inglês	
Identificador: 	http://archimer.ifremer.fr/doc/2006/publication-1987.pdf

DOI:10.1016/j.mri.2006.04.014	
Editor: 	Elsevier	
Relação: 	http://archimer.ifremer.fr/doc/00000/1987/	
Formato: 	application/pdf	
Fonte: 	Magnetic Resonance Imaging (0730-725X) (Elsevier), 2006-10 , Vol. 24 , N. 8 , P. 1103-1110	
Fonte: 	2006 Elsevier Inc