para-Hydrogen to enhance MRI sensitivity

摘要

An insight into the nuclear spins of hydrogen molecules could lead to sensitivity enhancement in magnetic resonance imaging(MRI).Molecular hydrogen,H_2,exists in two forms termedpara-hydrogen and ortho-hydrogen.These so-called spin isotopomers have slightly different physical properties,and different sets of nuclear spin and nuclear rotational states.In ortho-hydrogen the nuclear spins are parallel,while in para-hydrogen they are antiparallel.