Neuroimage. 2013 Jan 26. doi: 10.1016/j.neuroimage.2013.01.023. [Epub ahead of print]

What can we learn from T2* maps of the cortex?

Cohen-Adad J.

Abstract

Studies have shown that T(2)* contrast can reveal features of cortical anatomy. However, understanding the relationship between T(2)* contrast and the underlying cyto- and myelo-architecture is not an easy task, given the number of confounds, such as myelin, iron, blood vessels and structure orientation. Moreover, it is difficult to obtain reliable T(2)* measurements in the cortex due to its thin and folded geometry and the presence of artifacts. This review addresses issues associated with T(2)* mapping in the human cortex. After describing the theory behind T(2)* relaxation, a list of practical steps is proposed to reliably acquire and process T(2)* data and then map these values within the cortex using surface-based analysis. The last section addresses the question: 'What can we gain from T(2)* cortical mapping?', with particular emphasis on Brodmann mapping.

PMID: 23357070