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- Title
Comparison of Wideband Steady-State Free Precession and T<sub>2</sub>-Weighted Fast Spin Echo in Spine Disorder Assessment at 1.5 and 3 T.
- Authors
Danagoulian, Giovanna S.; Lei Qin; Nayak, Krishna S.; Colen, Rivka R.; Mukundan, Jr., Srinivasan; Harris, Mitchell B.; Jolesz, Ferenc A.; Shankaranarayanan, Ajit; Copen, William A.; Schmidt, Ehud J.
- Abstract
Wideband steady-state free precession (WB-SSFP) is a modification of balanced steady-state free precession utilizing alternating repetition times to reduce susceptibility-induced balanced steady-state free precession limitations, allowing its use for high-resolution myelographic-contrast spinal imaging. Intertissue contrast and spatial resolution of complete-spinecoverage 3D WB-SSFP were compared with those of 2D T2-weighted fast spin echo, currently the standard for spine T2-imaging. Six normal subjects were imaged at 1.5 and 3 T. The signal-to-noise ratio efficiency (SNR per unit-time and unit-volume) of several tissues was measured, along with four intertissue contrast-to-noise ratios; nerve-ganglia:fat, intradural- nerves:cerebrospinal fluid, nerve-ganglia:muscle, and muscle:fat. Patients with degenerative and traumatic spine disorders were imaged at both MRI fields to demonstrate WBSSFP clinical advantages and disadvantages. At 3 T, WBSSFP provided spinal contrast-to-noise ratios 3.7-5.2 times that of fast spin echo. At 1.5 T, WB-SSFP contrast-to-noise ratio was 3-3.5 times that of fast spin echo, excluding a 1.7 ratiofor intradural-nerves:cerebrospinal fluid. WB-SSFP signalto- noise ratio efficiency was also higher. Three-dimensional WB-SSFP disadvantages relative to 2D fast spin echo are reduced edema hyperintensity, reduced muscle signal, and higher motion sensitivity. WB-SSFP's high resolution and contrast- to-noise ratio improved visualization of intradural nerve bundles, foraminal nerve roots, and extradural nerve bundles, improving detection of nerve compression in radiculopathy and spinal-stenosis. WB-SSFP's high resolution permitted reformatting into orthogonal planes, providing distinct advantages in gauging fine spine pathology.
- Publication
Magnetic Resonance in Medicine, 2012, Vol 68, Issue 5, p1527
- ISSN
0740-3194
- Publication type
Article
- DOI
10.1002/mrm.24163