Imaging of soft tissues adjacent to orthopedic hardware: comparison of 3-T and 1.5-T MRI.
AJR Am J Roentgenol
; 194(1): W60-4, 2010 Jan.
Article
em En
| MEDLINE
| ID: mdl-20028892
ABSTRACT
OBJECTIVE:
The purpose of this study was to compare metal artifact reduction techniques at 1.5-T and 3-T MRI. MATERIALS ANDMETHODS:
A titanium plate with steel screws was placed in a freshly harvested pig leg. The leg was imaged with 1.5-T and 3-T MRI. A T2-weighted turbo spin-echo sequence was used with echo-train lengths of 8, 16, 32, and 64 and a constant readout bandwidth of 31.2 kHz. The images were compared qualitatively, and the optimal echo-train length was selected. Images were acquired at the optimal echo-train length with four different readout bandwidths. Artifact was measured quantitatively, and image quality was ranked qualitatively. The qualitatively best image acquired at 1.5 T was compared with the qualitatively highest-ranked image acquired at 3 T.RESULTS:
At both 1.5 T and 3 T, optimal images of equal quality were produced at echo-train lengths of 8 and 16. At higher readout bandwidths, there was quantitatively less artifact. The qualitatively best images were acquired at a readout bandwidth of 31.2 kHz at 1.5 T and 62.5 kHz at 3 T (Cronbach's alpha=1.00). The optimal image at 3 T was qualitatively superior to that at 1.5 T.CONCLUSION:
Optimizing image acquisition parameters in this phantom model resulted in similar quantitative susceptibility artifact at 3 T and 1.5 T and better qualitative images at 3 T than at 1.5 T.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Placas Ósseas
/
Parafusos Ósseos
/
Imageamento por Ressonância Magnética
/
Aumento da Imagem
/
Artefatos
Tipo de estudo:
Qualitative_research
Limite:
Animals
Idioma:
En
Revista:
AJR Am J Roentgenol
Ano de publicação:
2010
Tipo de documento:
Article