- 期刊
Effects of b-Value and Echo Time on Magnetic Resonance Diffusion Tensor Imaging-Derived Parameters at 1.5 T: A Voxel-Wise Study
並列摘要
The diffusion weighting factor (b-value) and echo time (TE) are two important parameters that influence quantitative measurements of diffusion tensor imaging (DTI). The present study employs a voxel-wise post-processing scheme to investigate the effects of b-value and TE on the reproducibility and accuracy of DTI-derived indices based on actual human brain data with commonly used imaging parameters. Five repeated DTI datasets of six b-values and five TE values were acquired from a healthy subject. The reproducibility and accuracy of axial diffusivity (AD), radial diffusivity (RD), mean diffusivity (MD), fractional anisotropy (FA), and the principal eigenvector (PEV) are assessed by calculating the voxel-wise standard deviation, coefficient of variance, and difference of mean values from the reference DTI dataset acquired with number of excitations (NEX) = 15. The results show that the reproducibility and accuracy of AD, RD, MD, FA, and PEV are significantly impacted by b-value and TE, and that there is a significant difference between gray and white matter tissues. Therefore, the reproducibility and accuracy of DTI-derived indices depends on the b-value and TE for both gray and white matter.
延伸閱讀
- Chang, H. N., Liao, T. C., Hsu, T. W., Lee, T. P., Yen, Y. S., Wu, H. M., Fan, Y. H., Hung, S. C., & Lirng, J. F. (2017). Accuracy of Inhance 3D Velocity-Based Magnetic Resonance Phase Contrast Venography in Intracranial Venous Steno-occlusive Disease. 臺灣醫事放射期刊, 5(1), 20-30. https://doi.org/10.6717/JTMRT.201703_5(1).0004
- Hsu, H. H. (2008). Estimation of Dynamic Contrast Enhanced Magnetic Resonance Imaging Parameters : Motion Artifact Correction [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2008.02313
- Wang, C. H. (2005). Estimating the Hemodynamic Response Timing in Functional MRI Using Coherence Analysis: Theory and Validation [master's thesis, National Taiwan University]. Airiti Library. https://doi.org/10.6342/NTU.2005.01481
- 王承元（2021）。Investigating subcortical abnormalities in mild cognitive impairment and Alzheimer’s disease using diffusion tensor imaging〔碩士論文，中山醫學大學〕。華藝線上圖書館。https://doi.org/10.6834/csmu202100166
- Srivastava, V., & Purwar, R. K. (2017). A Five-Level Wavelet Decomposition and Dimensional Reduction Approach for Feature Extraction and Classification of MR and CT Scan Images. Applied Computational Intelligence and Soft Computing, 2017(), 241-249. https://doi.org/10.1155/2017/9571262