Novena Rangwala1, Gopal Varma1, David Hackney1, David C. Alsop1
1Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, United States
Previous studies proposed a new magnetization transfer (MT)-based contrast mechanism referred to as inhomogeneous magnetization transfer (ihMT) and showed its sensitivity and specificity to myelin. This study extends the ihMT quantification to the brainstem and cervical spinal cord. Sagittal EPI images were acquired after MT saturation to measure myelin content along the length of the spinal cord. Results show ihMT ratios of ~5% in the brain stem, increasing to ~6.5% in the cervical spinal cord at C3, and were consistent across healthy volunteers. Additionally, the images reveal saturation of all tissues except white matter, emphasizing the specificity of the measure.