Diffusion-weighted MRS and MRI : methods and neuro applications

Ercan, A.E. (2015)

Doctoral Thesis

Diffusion-weighted magnetic resonance spectroscopy (DW-MRS) can play a key role in understanding neurobiological mechanisms of diseases that affect the human brain. The specific changes that occur within neurons can be reflected as changes in the diffusivity of tNAA, whereas the changes in glial cells can cause pronounced changes in the diffusivities of tCr and tCho. This information combined with that obtained from diffusion tensor imaging (DTI) and other MRI tools can help elucidate various disease processes in the future. The main purposes of this thesis are (i) to investigate neuroanatomy in vivo with DW-MRS, (ii) to develop methodology to enable future clinical applications of the technique in human brain in vivo, and (iii) to characterize the microstructural deficit in neuropsychiatric systemic lupus erythematous (NPSLE) with DW-MRS and other microstructural tools such as DTI and magnetization transfer imaging. The studies presented in this thesis show the robustness and clinical relevance of microstructural information obtained via DW-MRS. The contributions of this thesis such as the optimized acquisition protocols for single volume DW-MRS, the robust DW-CSI and DW-MRS post-processing pipelines that comprise information from DTI, will all facilitate the applications of DW-MRS both for basic neuroscience research and clinical research studies.

• DTI
• MRS
• MRI
• Neuroimaging
• Brain metabolites
• Tissue microstructure
• Spectroscopy
• Diffusion

• All authors: Ercan, A.E.
• Supervisor: Webb, A.G.
• Co-supervisor: Ronen, I.
• Qualification: Doctor (dr.)
• Awarding Institution: Leiden University Medical Center (LUMC), Leiden University
• Date: 2015-12-16
• ISBN (print): 9789462598775