Dynamic cardiac MRI with high spatiotemporal resolution using accelerated spiral-out and spiral-in/out bSSFP pulse sequences at 1.5 T.
MAGMA
; 36(6): 857-867, 2023 Dec.
Article
em En
| MEDLINE
| ID: mdl-37665502
ABSTRACT
OBJECTIVE:
To develop two spiral-based bSSFP pulse sequences combined with L + S reconstruction for accelerated ungated, free-breathing dynamic cardiac imaging at 1.5 T. MATERIALS ANDMETHODS:
Tiny golden angle rotated spiral-out and spiral-in/out bSSFP sequences combined with view-sharing (VS), compressed sensing (CS), and low-rank plus sparse (L + S) reconstruction were evaluated and compared via simulation and in vivo dynamic cardiac imaging studies. The proposed methods were then validated against the standard cine, in terms of quantitative image assessment and qualitative quality rating.RESULTS:
The L + S method yielded the least residual artifacts and the best image sharpness among the three methods. Both spiral cine techniques showed clinically diagnostic images (score > 3). Compared to standard cine, there were significant differences in global image quality and edge sharpness for spiral cine techniques, while there was significant difference in image contrast for the spiral-out cine but no significant difference for the spiral-in/out cine. There was good agreement in left ventricular ejection fraction for both the spiral-out cine (- 1.6 [Formula see text] 3.1%) and spiral-in/out cine (- 1.5 [Formula see text] 2.8%) against standard cine.DISCUSSION:
Compared to the time-consuming standard cine (~ 5 min) which requires ECG-gating and breath-holds, the proposed spiral bSSFP sequences achieved ungated, free-breathing cardiac movies at a similar spatial (1.5 × 1.5 × 8 mm3) and temporal resolution (36 ms) per slice for whole heart coverage (10-15 slices) within 45 s, suggesting the clinical potential for improved patient comfort or for imaging patients with arrhythmias or who cannot hold their breath.Palavras-chave
Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Função Ventricular Esquerda
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Imagem Cinética por Ressonância Magnética
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Coração
Tipo de estudo:
Qualitative_research
Limite:
Humans
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article