NCIt definition : An orally administered aqueous suspension of silicone-coated, superparamagnetic iron
oxide used as a magnetic resonance imaging (MRI) contrast agent. After oral administration,
ferumoxsil fills the stomach and intestines. Upon exposure to the strong external
magnetic field during MRI, ferumoxsil exhibits strong T1 relaxation properties and
a strongly varying local magnetic field; T2 relaxation is enhanced, thereby darkening
the contrast agent-containing portion of the gastrointestinal tract. Delineation of
the bowel is thus enhanced, distinguishing bowel from organs and tissues adjacent
to the upper regions of the gastrointestinal tract.;