CArtesian sampling with Variable density and Adjustable temporal resolution (CAVA).
Magn Reson Med
; 83(6): 2015-2025, 2020 06.
Article
em En
| MEDLINE
| ID: mdl-31721303
ABSTRACT
PURPOSE:
To develop a variable density Cartesian sampling method that allows retrospective adjustment of temporal resolution for dynamic MRI applications and to validate it in real-time phase contrast MRI (PC-MRI). THEORY ANDMETHODS:
The proposed method, called CArtesian sampling with Variable density and Adjustable temporal resolution (CAVA), begins by producing a sequence of phase encoding indices based on the golden ratio increment. Then, variable density is introduced by nonlinear stretching of the indices. Finally, the elements of the resulting sequence are rounded up to the nearest integer. The performance of CAVA is evaluated using PC-MRI data from a pulsatile flow phantom and real-time, free-breathing data from ten healthy volunteers.RESULTS:
CAVA enabled image recovery at various temporal resolutions that were selected retrospectively. For the pulsatile flow phantom, image quality and flow quantification accuracy from CAVA were comparable to that from another pseudo-random sampling pattern with fixed temporal resolution. In addition, flow quantification results based on CAVA were in good agreement with a breath-held segmented acquisition.CONCLUSIONS:
By allowing retrospective binning of the MRI data, CAVA provides an avenue to retrospectively adjust the temporal resolution of PC-MRI.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Imageamento por Ressonância Magnética
/
Interpretação de Imagem Assistida por Computador
Tipo de estudo:
Observational_studies
Limite:
Humans
Idioma:
En
Revista:
Magn Reson Med
Ano de publicação:
2020
Tipo de documento:
Article