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PT  - JOURNAL ARTICLE
AU  - Zaharchuk, G.
AU  - Saritas, E.U.
AU  - Andre, J.B.
AU  - Chin, C.T.
AU  - Rosenberg, J.
AU  - Brosnan, T.J.
AU  - Shankaranarayan, A.
AU  - Nishimura, D.G.
AU  - Fischbein, N.J.
TI  - Reduced Field-of-View Diffusion Imaging of the Human Spinal Cord: Comparison with Conventional Single-Shot Echo-Planar Imaging
AID  - 10.3174/ajnr.A2418
DP  - 2011 May 01
TA  - American Journal of Neuroradiology
PG  - 813--820
VI  - 32
IP  - 5
4099  - http://www.ajnr.org/content/32/5/813.short
4100  - http://www.ajnr.org/content/32/5/813.full
SO  - Am. J. Neuroradiol.2011 May 01; 32
AB  - BACKGROUND AND PURPOSE: DWI of the spinal cord is challenging because of its small size and artifacts associated with the most commonly used clinical imaging method, SS-EPI. We evaluated the performance of rFOV spinal cord DWI and compared it with the routine fFOV SS-EPI in a clinical population. MATERIALS AND METHODS: Thirty-six clinical patients underwent 1.5T MR imaging examination that included rFOV SS-EPI DWI of the cervical spinal cord as well as 2 comparison diffusion sequences: fFOV SS-EPI DWI normalized for either image readout time (low-resolution fFOV) or spatial resolution (high-resolution fFOV). ADC maps were created and compared between the methods by using single-factor analysis of variance. Two neuroradiologists blinded to sequence type rated the 3 DWI methods, based on susceptibility artifacts, perceived spatial resolution, signal intensity–to-noise ratio, anatomic detail, and clinical utility. RESULTS: ADC values for the rFOV and both fFOV sequences were not statistically different (rFOV: 1.01 ± 0.18 × 10−3 mm2/s; low-resolution fFOV: 1.12 ± 0.22 × 10−3 mm2/s; high-resolution fFOV: 1.10 ± 0.21 × 10−3 mm2/s; F = 2.747, P &amp;gt; .05). The neuroradiologist reviewers rated the rFOV diffusion images superior in terms of all assessed measures (P &amp;lt; 0.0001). Particular improvements were noted in patients with metal hardware, degenerative disease, or both. CONCLUSIONS: rFOV DWI of the spinal cord overcomes many of the problems associated with conventional fFOV SS-EPI and is feasible in a clinical population. From a clinical standpoint, images were deemed superior to those created by using standard fFOV methods. ADCapparent diffusion coefficientAPanteroposteriorDTIdiffusion tensor imagingDWIdiffusion-weighted MR imagingEPIecho-planar imagingfFOVfull FOVHiReshigh resolutionisoDWIisotropic DWILoReslow resolutionRFradio frequencyrFOVreduced FOVROIregion of interestSNRsignal intensity to noise ratioSS-EPIsingle-shot EPISTIRshort tau inversion recoveryZOOM-EPIzonal oblique multisection EPI