TY - JOUR
T1 - Pulse-triggered DTI sequence with reduced FOV and coronal acquisition at 3T for the assessment of the cervical spinal cord in patients with myelitis
AU - Hodel, J.
AU - Besson, P.
AU - Outteryck, O.
AU - Zéphir, H.
AU - Ducreux, D.
AU - Monnet, A.
AU - Chéchin, D.
AU - Zins, M.
AU - Rodallec, M.
AU - Pruvo, J. P.
AU - Vermersch, P.
AU - Leclerc, X.
PY - 2013/3
Y1 - 2013/3
N2 - BACKGROUND AND PURPOSE: DTI is a promising technique for imaging of the spinal cord, but the technique has susceptibility-induced artifacts. We evaluated a pulse-triggered DTI sequence with an rFOV technique and coronal acquisition for the assessment of the cervical spinal cord in patients with myelitis at 3T. MATERIALS AND METHODS: A rFOV acquisition was established by a noncoplanar application of the excitation and the refocusing pulse in conjunction with outer volume suppression. The DTI sequence was performed in the coronal plane in 12 healthy volunteers and 40 consecutive patients with myelitis. Probabilistic tractography of the posterior and lateral funiculi was performed from the C1 to C7 levels. FA, MD, aD, rD, and ratios of aD and rD were measured. RESULTS: In healthy volunteers, mean DTI indices within the whole-fiber pathways were the following: FA = 0.61, MD = 1.17 X 10-3 mm2/s, aD = 1.96 X 10-3 mm2/s, rD = 0.77 X 10-3 mm2/s, and ratios of aD and rD = 2.5. Comparison of healthy controls and patients with myelitis identified statistically significant differences for all DTI parameters. Different patterns of myelitis, including spinal cord atrophy and active inflammatory lesions, were recognized. There was a significant correlation between clinical severity and DTI parameters. CONCLUSIONS: The present work introduces a new approach for DTI of the cervical spinal cord at 3T, enabling a quantitative follow-up of patients with myelitis.
AB - BACKGROUND AND PURPOSE: DTI is a promising technique for imaging of the spinal cord, but the technique has susceptibility-induced artifacts. We evaluated a pulse-triggered DTI sequence with an rFOV technique and coronal acquisition for the assessment of the cervical spinal cord in patients with myelitis at 3T. MATERIALS AND METHODS: A rFOV acquisition was established by a noncoplanar application of the excitation and the refocusing pulse in conjunction with outer volume suppression. The DTI sequence was performed in the coronal plane in 12 healthy volunteers and 40 consecutive patients with myelitis. Probabilistic tractography of the posterior and lateral funiculi was performed from the C1 to C7 levels. FA, MD, aD, rD, and ratios of aD and rD were measured. RESULTS: In healthy volunteers, mean DTI indices within the whole-fiber pathways were the following: FA = 0.61, MD = 1.17 X 10-3 mm2/s, aD = 1.96 X 10-3 mm2/s, rD = 0.77 X 10-3 mm2/s, and ratios of aD and rD = 2.5. Comparison of healthy controls and patients with myelitis identified statistically significant differences for all DTI parameters. Different patterns of myelitis, including spinal cord atrophy and active inflammatory lesions, were recognized. There was a significant correlation between clinical severity and DTI parameters. CONCLUSIONS: The present work introduces a new approach for DTI of the cervical spinal cord at 3T, enabling a quantitative follow-up of patients with myelitis.
UR - http://www.scopus.com/inward/record.url?scp=84876586847&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84876586847&partnerID=8YFLogxK
U2 - 10.3174/ajnr.A3254
DO - 10.3174/ajnr.A3254
M3 - Article
C2 - 22918433
AN - SCOPUS:84876586847
SN - 0195-6108
VL - 34
SP - 676
EP - 682
JO - American Journal of Neuroradiology
JF - American Journal of Neuroradiology
IS - 3
ER -