Reduced slab boundary artifact in multi-slab 3D fast spin-echo imaging.
Magn Reson Med
; 44(2): 269-76, 2000 Aug.
Article
em En
| MEDLINE
| ID: mdl-10918326
ABSTRACT
The three-dimensional multi-slab fast spin-echo (3DFSE) sequence is a time-efficient technique for volume scanning which provides images with a good signal-to-noise ratio, adjustable contrast weighting, and high spatial resolution. Unfortunately, it suffers from slice-to-slice amplitude variation associated with imperfect slab definition. This slab boundary artifact becomes especially apparent when multiplanner reformatting is used to create alternate anatomical views. The shifted interleaved multi-volume acquisition (SIMVA) described here suppresses slab boundary artifact in image space. It displaces each slab (RF excitation) position incrementally along the slice (z) axis, in coordination with the primary phase encode step, so that the slab boundary artifact is converted into a correctable amplitude modulation in the primary phase encode direction (k(Y)-axis). After the Fourier transform in primary phase encoding, the slab boundary artifact is mapped into a different and less severe artifact on a different spatial axis. Preliminary measurements show that SIMVA reduces the slab boundary artifact by an order of magnitude in multiplanar reformatted views. Magn Reson Med 44269-276, 2000.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Processamento de Imagem Assistida por Computador
/
Imagem Ecoplanar
Limite:
Humans
Idioma:
En
Revista:
Magn Reson Med
Assunto da revista:
DIAGNOSTICO POR IMAGEM
Ano de publicação:
2000
Tipo de documento:
Article