Similarly, the use of dual-echo FSPGR for DCE-MRI generates T1-weighted images with and without fat suppression in a single acquisition.
Abbreviated breast MRI consisting of a single T2 weighted fast spin echo (FSE) triple echo Dixon sequence and a dual echo fast spoiled gradient echo sequence (FSPGR) before and after the administration of contrast, compliant with ACR standards for the accreditation of breast MRI, with sensitivity for breast cancer detection equivalent to full protocol DCE-MRI, but with greatly reduced scan and table times, is feasible.
Contrast-enhanced fat suppressed 3D FSPGR image showing well defined lobulated lesion with smooth margin in right breast.
Contrast-enhanced fat suppressed 3D FSPGR image showing irregular lesion with spiculated margin in left breast; HPR-invasive ductal carcinoma with ductal carcinoma in situ.
Caption: Figure 4: Sagittal reformatted postcontrast FSPGR images demonstrating filling defect within the left sigmoid sinus and proximal jugular vein.
Caption: Figure 5: Sagittal reformatted postcontrast FSPGR images demonstrating filling defect within the left sigmoid sinus and a clearer view of the jugular vein.
The sagittal Fast Spoiled Gradient Recall Echo (FSPGR) pulse sequence with the following parameters was adopted: field intensity 3 T, repetition time 6.9 s, time of echo 1.5 s, inversion time 500 ms, Bandwidth 31.25 KHz, flip angle 12 deg, matrix 256 x 256, slice thickness 1.2 mm, voxel dimensions 1.17 x 1.17 x 0.6 mm, and a 1-signal average.
Abbreviations 3-D: Three-dimensional AL: Anterolateral AM: Anteromedial BA: Bland and Altman CoV: Coefficient of Variation CSC: Cross-sectional Circularity CSSA: Cross-sectional Surface Area CS: Copper Sulphate FSPGR: Fast Spoiled Gradient Recall Echo HS: Hydrostatic Socket ICC: Intraclass Correlation Coefficient MRI: Magnetic Resonance Imaging PL: Posterolateral PM: Posteromedial POP: Plaster of Paris PTB: Patellar Tendon Bearing SD: Standard Deviation SXCT: Spiral X-ray Computer Tomography TSB: Total Surface Bearing.
High-resolution T1-weighted images were acquired using a 3-dimensional fast spoiled gradient-echo (T1-3D FSPGR
) sequence (repetition time (TR) = 5.956 ms, echo time (TE)= 1.964 ms, flip angle (FA) = 9[degrees], matrix = 256 x 256, field of view (FOV) = 25.6 x 25.6 [cm.sup.2], slice thickness = 1 mm, no gap, 152 slices).
High-resolution T1-weighted anatomical scans were collected in the coronal plane (FSPGR
BRAVO sequence; voxel size = 0.86 x 0.86 x 1 mm, number of slices = 280, repetition time (TR) = 7300 ms, echo time (TE) = 2.8 ms, and flip angle = 9[degrees]; parallel imaging with an acceleration factor of 1.5).
We acquired also a 3D FSPGR
T1-weighted sequence (TR/TE = 5.9/2.1 ms; flip angle 12[degrees], isotropic voxel = 1 x 1 x 1 [mm.sup.3], acquisition time = 4' 50").
The participants underwent a protocol including one task-dependent block-design BOLD sequence and a FSPGR