Fat suppression at three-dimensional T1-weighted MR imaging of the hands: Dixon method versus CHESS technique - 05/01/18
, V. Perlepe , N. Michoux , A. Larbi , B. Vande Berg
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Highlights |
• | Dixon yields effective fat suppression at 3D T1-weighted MRI of the hands. |
• | SNR is higher with Dixon than with CHESS at 3D T1-weighted MR imaging of the hands. |
Abstract |
Purpose |
To compare the effectiveness of fat suppression and the image quality of the Dixon method with those of the chemical shift-selective (CHESS) technique in hands of normal subjects at non-enhanced three-dimensional (3D) T1-weighted MR imaging.
Materials and methods |
Both hands of 14 healthy volunteers were imaged with 3D fast spoiled gradient echo (FSPGR) T1-weighted Dixon, 3D FSPGR T1-weighted CHESS and 3D T1-weighted fast spin echo (FSE) CHESS sequences in a 1.5T MR scanner. Three radiologists scored the effectiveness of fat suppression in bone marrow (EFSBM) and soft tissues (EFSST) in 20 joints per subject. One radiologist measured the signal-to-noise ratio (SNR) in 10 bones per subject. Statistical analysis used two-way ANOVA with random effects (P<0.0083), paired t-test (P<0.05) and observed agreement to assess differences in effectiveness of fat suppression, differences in SNR and interobserver agreement.
Results |
EFSBM was statistically significantly higher for the 3D FSPGR T1-weighted Dixon than for the 3D FSPGR T1-weighted CHESS sequence and the 3D FSE T1-weighted CHESS sequence (P<0.0001). EFSST was statistically significantly higher for the 3D FSPGR T1-weighted Dixon than for the 3D FSPGR T1-weighted CHESS sequence (P<0.0011) and for the 3D FSE T1-weighted CHESS sequence in the axial plane (P=0.0028). Mean SNR was statistically significantly higher for 3D FSPGR T1-weighted Dixon sequence than for 3D FSPGR T1-weighted CHESS and 3D FSE T1-weighted CHESS sequences (P<0.0001).
Conclusion |
The Dixon method yields more effective fat suppression and higher SNR than the CHESS technique at 3D T1-weighted MR imaging of the hands.
El texto completo de este artículo está disponible en PDF.Keywords : MRI, Fat, Dixon, IDEAL, Hands
Abbreviations : CHESS, EFSBM, EFSST, FSE, FSPGR, ROI, SNR
Esquema
Vol 99 - N° 1
P. 23-28 - janvier 2018 Regresar al número
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Bienvenido a EM-consulte, la referencia de los profesionales de la salud.