DGM deep gray matter DTI diffusion tensor imaging FA fractional anisotropy GM gray matter ICP-MS inductively coupled plasma mass spectrometry PMI postmortem interval QSM quantitative susceptibility mapping STAR-QSM streaking artifact reduction QSM WM white matter 1 Introduction The aging process affects the human brain through a complex interaction of structural and molecular changes [1, 2]. Magnetic resonance imaging (MRI) techniques play a fundamental role in studying these effects [3].