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·2025
Fast neuromelanin imaging using the EP-vfMT technique
Se‐Hong Oh, Ken Sakaie, Stephen E. Jones, Mark J. Lowe
Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition/Proceedings of the International Society for Magnetic Resonance in Medicine, Scientific Meeting and Exhibition
초록

Motivation: Loss of neuromelanin (NM) in brainstem structures is evident in pathology in early neurodegenerative disease. In-vivo neuromelanin imaging is a potential biomarker, but previously-developed approaches can be too lengthy for routine clinical use. Goal(s): To optimize the contrast of locus coeruleus (LC) and substantia nigra (SN) in a fast, segmented EPI readout variable flip-angle magnetization transfer (EP-vfMT) acquisition. Approach: Contrast of LC and SN were optimized as a function of echo time (TE), repetition time (TR), and MT flip-angle while limiting scan time to 5 minutes. Results: Optimal contrast was found by minimizing TE and maximizing MT flip-angle. Contrast was insensitive to TR. Impact: The speed of the proposed acquisition will enable examination of EP-vfMT as an imaging biomarker for early-stage neurodegeneration in Parkinson's disease, Alzheimer's disease and other neurogenerative disorders.

키워드
NeuromelaninLocus coeruleusSubstantia nigraContrast (vision)NeurodegenerationLimiting
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게재 연도
2025

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