T Kirchgesner1, V Perlepe2, N Michoux3, A Larbi4, B Vande Berg5. 1. Musculoskeletal Imaging Unit, cliniques universitaires Saint-Luc, université catholique de Louvain, institut de recherche expérimentale et clinique (IREC), 10, avenue Hippocrate, 1200 Brussels, Belgium. Electronic address: Thomas.Kirchgesner@uclouvain.be. 2. Musculoskeletal Imaging Unit, cliniques universitaires Saint-Luc, université catholique de Louvain, institut de recherche expérimentale et clinique (IREC), 10, avenue Hippocrate, 1200 Brussels, Belgium. Electronic address: Vasiliki.Perlepe@uclouvain.be. 3. Musculoskeletal Imaging Unit, cliniques universitaires Saint-Luc, université catholique de Louvain, institut de recherche expérimentale et clinique (IREC), 10, avenue Hippocrate, 1200 Brussels, Belgium. Electronic address: Nicolas.Michoux@uclouvain.be. 4. Musculoskeletal Imaging Unit, cliniques universitaires Saint-Luc, université catholique de Louvain, institut de recherche expérimentale et clinique (IREC), 10, avenue Hippocrate, 1200 Brussels, Belgium. Electronic address: Ahmed.Larbi@chu-nimes.fr. 5. Musculoskeletal Imaging Unit, cliniques universitaires Saint-Luc, université catholique de Louvain, institut de recherche expérimentale et clinique (IREC), 10, avenue Hippocrate, 1200 Brussels, Belgium. Electronic address: Bruno.VandeBerg@uclouvain.be.
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.
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.
Authors: Thomas Kirchgesner; Maria Stoenoiu; Patrick Durez; Nicolas Michoux; Bruno Vande Berg Journal: J Belg Soc Radiol Date: 2022-01-10 Impact factor: 1.894