In-phase zero TE musculoskeletal imaging.
Magn Reson Med
; 83(1): 195-202, 2020 01.
Article
em En
| MEDLINE
| ID: mdl-31429994
ABSTRACT
PURPOSE:
To introduce a new method for in-phase zero TE (ipZTE) musculoskeletal MR imaging.METHODS:
ZTE is a 3D radial imaging method, which is sensitive to chemical shift off-resonance signal interference, especially around fat-water tissue interfaces. The ipZTE method addresses this fat-water chemical shift artifact by acquiring each 3D radial spoke at least twice with varying readout gradient amplitude and hence varying effective sampling time. Using k-space-based chemical shift decomposition, the acquired data is then reconstructed into an in-phase ZTE image and an out-of-phase disturbance.RESULTS:
The ipZTE method was tested for knee, pelvis, brain, and whole-body. The obtained images demonstrate exceptional soft-tissue uniformity free from out-of-phase disturbances apparent in the original ZTE images. The chemical shift decomposition was found to improve SNR at the cost of reduced image resolution.CONCLUSION:
The ipZTE method can be used as an averaging mechanism to eliminate fat-water chemical shift artifacts and improve SNR. The method is expected to improve ZTE-based musculoskeletal imaging and pseudo CT conversion as required for PET/MR attenuation correction and MR-guided radiation therapy planning.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Planejamento da Radioterapia Assistida por Computador
/
Encéfalo
/
Imageamento por Ressonância Magnética
/
Tecido Adiposo
/
Músculo Esquelético
Limite:
Humans
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article