글로벌 연구동향
의학물리학
- 2022년 03월호
[IEEE Trans Med Imaging.] Improved Multi-Echo Gradient-Echo-Based Myelin Water Fraction Mapping Using Dimensionality Reduction연세대 / 송재은, 김동현*
- 출처
- IEEE Trans Med Imaging.
- 등재일
- 2022 Jan
- 저널이슈번호
- 41(1):27-38. doi: 10.1109/TMI.2021.3102977. Epub 2021 Dec 30.
- 내용
Abstract
Multi-echo gradient-echo (mGRE)-based myelin water fraction (MWF) mapping is a promising myelin water imaging (MWI) modality but is vulnerable to noise and artifact corruption. The linear dimensionality reduction (LDR) method has recently shown improvements with regard to these challenges. However, the magnitude value based low rank operators have been shown to misestimate the MWF for regions with [Formula: see text] anisotropy. This paper presents a nonlinear dimensionality reduction (NLDR) method to estimate the MWF map better by encouraging nonlinear low dimensionality of mGRE signal sources. Specifically, we implemented a fully connected deep autoencoder to extract the low-dimensional features of complex-valued signals and incorporated a sparse regularization to separate the anomaly sources that do not reside in the low-dimensional manifold. Simulations and in vivo experiments were performed to evaluate the accuracy of the MWF map under various situations. The proposed NLDR-based MWF improves the accuracy of the MWF map over the conventional nonlinear least-squares method and the LDR-based MWF and maintains robustness against noise and artifact corruption.Jae Eun Song, Dong-Hyun Kim
- 덧글달기
- 이전글 [Radiation Measurements] A small-scale realistic inter-laboratory accident dosimetry comparison using the TL/OSL from mobile phone components
- 다음글 [IEEE Trans Med Imaging.] Joint Reconstruction of Vascular Structure and Function Maps in Dynamic Contrast Enhanced MRI Using Vascular Heterogeneity Priors