Multidimensional correlation spectroscopic imaging of exponential decays: From theoretical principles to in vivo human applications.

ABSTRACT: Multiexponential modeling of relaxation or diffusion MR signal decays is a popular approach for estimating and spatially mapping different microstructural tissue compartments. While this approach can be quite powerful, it is also limited by the fact that one-dimensional multiexponential modeling is an ill-posed inverse problem with substantial ambiguities. In this article, we present an overview of a recent multidimensional correlation spectroscopic imaging approach to this problem. This approach helps to alleviate ill-posedness by making advantageous use of multidimensional contrast encoding (e.g., 2D diffusion-relaxation encoding or 2D relaxation-relaxation encoding) combined with a regularized spatial-spectral estimation procedure. Theoretical calculations, simulations, and experimental

SUBMITTER: Kim D 

PROVIDER: S-EPMC7338241 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature