Clinical application and technical considerations of T & T(*) mapping in cardiac, liver, and renal imaging.

Pathological tissue alterations due to disease processes such as fibrosis, edema and infiltrative disease can be non-invasively visualized and quantified by MRI using T and T relaxation properties. Pixel-wise mapping of T and T image sequences enable direct quantification of T, T(), and extracellular volume values of the target organ of interest. Tissue characterization based on T and T() mapping is currently making the transition from a research tool to a clinical modality, as clinical usefulness has been established for several diseases such as myocarditis, amyloidosis, Anderson-Fabry and iron deposition. Other potential clinical applications besides the heart include, quantification of steatosis, cirrhosis, hepatic siderosis and renal fibrosis. Here, we provide an overview of potential clinical applications of T andT() mapping for imaging of cardiac, liver and renal disease. Furthermore, we give an overview of important technical considerations necessary for clinical implementation of quantitative parametric imaging, involving data acquisition, data analysis, quality assessment, and interpretation. In order to achieve clinical implementation of these techniques, standardization of T and T() mapping methodology and validation of impact on clinical decision making is needed.