Left atrial late gadolinium enhancement with water-fat separation: the importance of phase-encoding order.
J Magn Reson Imaging
; 40(1): 119-25, 2014 Jul.
Article
en En
| MEDLINE
| ID: mdl-24105717
ABSTRACT
PURPOSE:
To compare two late gadolinium enhancement (LGE) cardiovascular magnetic resonance (CMR)methods:
a Dixon LGE sequence with sequential phase-encoding order, reconstructed using water-fat separation, and standard fat-saturated LGE. MATERIALS ANDMETHODS:
We implemented a dual-echo Dixon LGE method for reconstructing water-only images and compared it to fat-saturated LGE in 12 patients prior to their first pulmonary vein isolation (PVI) procedure. Images were analyzed for quality and fat-suppression. Regions of the left atrium were evaluated by a blinded observer (1 = prominent enhancement, 0 = mild or absent enhancement) on two sets of images (fat-saturated and water-only LGE) and agreement was assessed.RESULTS:
Water-only LGE showed a trend toward better fat-suppression (P = 0.06), with a significantly more homogeneous blood pool signal and reduced inflow artifacts (both P < 0.01). Agreement between fat-saturated LGE and water-only methods was found in 84% of regions, significantly correlated by chi-squared test (P < 0.001). The kappa value was 0.52 (moderate). The average number of enhancing segments was higher for fat-saturated LGE than water-only LGE (4.2 ± 2.7 vs. 3.2 ± 2.9, P = 0.03).CONCLUSION:
The two-point Dixon LGE technique reduces artifacts due to a centric k-space order. A similar enhancement pattern was observed irrespective of the LGE technique, with more enhancement detected by fat-saturated LGE.Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Fibrilación Atrial
/
Agua Corporal
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Imagen por Resonancia Magnética
/
Tejido Adiposo
/
Técnica de Sustracción
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Aturdimiento Miocárdico
/
Gadolinio
Tipo de estudio:
Diagnostic_studies
/
Etiology_studies
Límite:
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
J Magn Reson Imaging
Asunto de la revista:
DIAGNOSTICO POR IMAGEM
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos