Comparing Structure and Dynamics of Solvation of Different Iron Oxide Phases for Enhanced Magnetic Resonance Imaging

摘要

Cancer is a global epidemic that significantly affects all ages and socioeconomic groups. One of the great difficulties of cancer is its diagnosis, mainly in the initial phase. Currently, the most used and effective technique for cancer diagnosis is Magnetic Resonance Imaging (MRI). For a better visualization of MRI images, it is necessary to use contrast agents (CAs). These CAs are paramagnetic compounds capable of enhancing the relaxation rates of water protons in tissues. The most used CAs in MRI are gadolinium (Gd~(3+)) complexes. However, these CAs are very toxic to the body.[5] Thus, in this study, the 100 faces of various iron oxides (δ-FeOOH, α-FeOOH, Fe2O3, Fe3 O4) were analyzed in order to replace Gd~(3+) complexes. For this purpose, calculations of molecular dynamics (MD) were performed and the main conformations were selected using the OWSCA method for subsequent quantum calculations of the hyperfine coupling constant. The results show a large increase in A_(iso) values. Thus, it is suggested that the compounds studied may be promising CAs in MRI.