Feasibility of quantitative ultrashort echo time (UTE)-based methods for MRI of peripheral nerve

NMR in Biomedicine
Shu-Juan FanSameer B Shah

Abstract

Peripheral nerves are a composite tissue consisting of neurovascular elements packaged within a well-organized extracellular matrix. Their composition, size, and anatomy render nerves a challenging medical imaging target. In contrast to morphological MRI, which represents the predominant approach to nerve imaging, quantitative MRI sequences can provide information regarding tissue composition. Here, we applied standard clinical Carr-Purcell-Meiboom-Gill (CPMG) and experimental three-dimensional (3D) ultrashort echo time (UTE) Cones sequences for quantitative nerve imaging including T2 measurement with single-component analysis, T2 * measurement with single-component and bi-component analyses, and magnetization transfer ratio (MTR) analysis. We demonstrated the feasibility and the high quality of single-component T2 *, bi-component T2 *, and MTR approaches to analyze nerves imaged with clinically deployed 3D UTE Cones pulse sequences. For 24 single fascicles from eight nerves, we measured a mean single-component T2 * of 22.6 ±8.9 ms, and a short T2 * component (STC) with a mean T2 * of 1.7 ±1.0 ms and a mean fraction of (6.74 ±4.31)% in bi-component analysis. For eight whole nerves, we measured a mean single-component T2 * of 16...Continue Reading

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Citations

Aug 11, 2020·Biomaterials Science·David B BerrySamuel R Ward
Nov 9, 2019·F1000Research·Yongsheng ChenJun Li

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