chemical shift artifact

chem·i·cal shift ar·ti·fact

in magnetic resonance imaging, a dark band caused by a biochemical difference in resonant frequency of adjacent regions rather than a true anatomic separation.
Farlex Partner Medical Dictionary © Farlex 2012
Mentioned in ?
References in periodicals archive ?
Other ancillary findings are associated joint effusion, potential chemical shift artifact and absence of magnetic susceptibility artifacts from hemosiderin.
Previous research has reported a chemical shift artifact on T1-weighted, T2-weighted, and proton-density MRI images of breast silicone implant phantoms [35].
The measured chemical shift artifact from casting materials could jeopardize residual limb boundary detection when constructing the 3-D model; the image of the casting material could superimpose onto the image of underlying soft tissue.
Chemical shift artifact was also detected (Figure 5).
(13-15) Villous synovial proliferations with a signal intensity similar to that of fat in all sequences, mass-like subsynovial deposits, large effusions, potential demonstration of associated chemical shift artifact at the interlace of the synovial lesion and the effusion, and no evidence of hemosiderin deposition are included in the MRI results identifying LA.
An increase in chemical shift artifact at 3T could be a significant limiting factor in routine anatomic imaging.
Chemical shift artifacts of the second kind are also known as "India ink" or phase cancellation artifacts and relate to the cancellation of signal in voxels containing both water and fat protons at TEs where fat and water protons are out-of-phase relative to each other.
Chemical shift artifacts, as well as magnetic and RF field inhomogeneities, are also important considerations at 3T.