Items tagged “mri artifacts”
5 results found
Article
Black boundary artifact
Black boundary artifact, also known as India ink artifact or type 2 chemical shift artifact, is an artificially-created black line located at fat-water interfaces such as those between muscle and fat. This results in a sharp delineation of the muscle-fat boundary lending the image an appearance ...
Article
Zebra stripes
Zebra stripes, a.k.a. zebra artifacts, appear as alternating bright and dark bands in a MRI image. The term has been used to describe several different kind of artifacts causing some confusion.
Artifacts that have been described as a zebra artifact include the following:
moire fringes 1,2...
Article
Dielectric effect artifact
Dielectric effect artifact is an MRI artifact encountered most often on body MRI with 3 T units.
Artifact
At 3 T, the radiofrequency (RF) wavelength measures 234 cm in air, and the speed and wavelength of the RF field is shortened to ~26 cm within the body as a result of dielectric effects. Ho...
Article
Shading artifact
Shading artifact is an MRI artifacts and refers to loss of signal intensity in one part of the image, leading to dark shading in this portion of the image.
Causes
uneven excitation of nuclei within the field; due to RF pulses applied at flip angles other than 90 and 180 degrees
abnormal loadi...
Article
Inhomogeneity artifact
The inhomogeneity artifact is a type of magnetic resonance imaging artifact that occurs due to multiple factors, such as irregular anatomical area (for example, shoulder, hips, ankles), presence of metallic objects or inhomogeneity of the main field.
The inhomogeneity artifact appears as hyperi...
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