Clinical Application of Balanced Steady-State Free Precession Technique in Neuroradiology
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Clinical Application of Balanced Steady-State Free
Precession Technique in Neuroradiology
Yueh-hsun LuHsiu-mei WuJiing-feng LimgWan-yuo Guo Cheng-yen Chang
Taipei Veterans General Hospital, TaiwanNational Yang-Ming University, Taiwan
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Properties of b-SSFP
•Total coherent steady-state magnetization
•Image contrast is given by T2/T1 ratio high signal of fluid and fat, and low signal of soft tissues
•Within a certain range, field inhomogeneity induced dephasing will be nearly completely refocused at TE=TR/2 (~SE)
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Balanced Steady-State Free Precession
Scheffler Eur Radiol 2003 13:2409–2418
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Clinical Application in Neuroradiology•Ventriculocisternography•MR myelography with brachial
plexus injury•CSF leakage•Delineation of intracranial cystic
lesion
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•Ventriculocisternography
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Obstructive hydrocephalus
Ventriculocisternography
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Presurgical Evaluation for Hydrocephalus
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•MR myelogram and brachial plexus image
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Brachial Plexus Imaging
T2WI Axi FIESTA
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Brachial Plexus Injury
31y/o M, Post Motorcycle Accident
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CSF Leakage
•Traumatic cause•Iatrogenic cause
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Post Traumatic CSF Leakage
T2WICT with bone window
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Post Traumatic CSF Leakage
Axi 3D FIESTA COR 3D FIESTA
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Post TSA CSF Rhinorrhea
3D FIESTA 1mmTR/TR/FA: 4.88/1.38/65•2D FSE T2WI
2mm
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3D FIESTA 1mmTR/TR/FA: 4.88/1.38/65
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•Delineation of cystic lesion
•Demonstration of normal structure
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Diagnosis and Delineation of Arachnoid Cyst
3-month-boy, Arachnoid cyst with hydronephrosis
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FLAIR DWI 3D b-SSFP
61/M, right trigeminal neuralgia for 3 years
Delineation of Epidermoid Cyst
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77/M vertigo attacks in recent weeks
Delineation of Cranial Nerves: CN 7th and 8th
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Detection and Delineation of Small Intracannalicular Acoustic Neuroma
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Discussion•The quality of image is somehow
machine and parameter dependent. Magnetic inhomogeneity will cause artifacts, such as banding artifact.
•Flip angle effect and section aliasing effect.
•Proper selection of TR/TE/Flip angle would improve the quality of image.
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α=70 ° α=50 ° α=30 °
AJNR 26:1170–1173, May 2005
flip angle effect alone is an important factor that presents an obvious tradeoff between image contrast and aliasing artifacts in 3D SSFP MR ventriculocisternography.
Section Aliasing Artifacts
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Conclusion•b-SSFP offers the highest SNR per unit
time of all other imaging sequences.•The dynamic equilibrium of b-SSFP is
insensitive to flow or motion.• It can provide the high resolution of
ventriculocystography for delineation of CSF space lesion, cranial nerve, intradural cervical nerve roots and detection of CSF leakage.
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Thank You For Your Attention
The 101 Building, Taipei, Taiwan
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Imaging of Membranous Labyrinth
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Imaging of 3D Membranous Labyrinth
75y/o m, TR/TE 6.9x1.7, 0.4mm, 14x14cm 488x256
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Artifacts of b-SSFP
•Banding artifact•Section aliasing artifact•Acquisition artifact•Susceptibility artifact
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Banding Artifact
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FIESTA C
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FOV 20x20 cm 182 slices
TR/TE/a: 5.49/1.47/65NEX:2
Matrix 448x256Slice thickness: 1.4 0.7 cm
FOV 24x24 cm 232 slices
TR/TE/a: 5.63/1.37/65NEX:2
Matrix 448x256Slice thickness: 1.4 0.7 mm