Items tagged “artifact”
29 results found
Article
Ring artifact
Ring artifacts are a CT phenomenon that occurs due to the miscalibration or failure of one or more detector elements in a CT scanner. Less often, it can be caused by insufficient radiation dose or contrast material contamination of the detector cover 2.
Features
This artifact usually occurs i...
Case
Mirror image artifact - scrotum
Published
20 Oct 2010
72% complete
Ultrasound
Case
Aliasing artifact
Published
22 Jan 2012
39% complete
MRI
Article
MRI artifacts
MRI artifacts are numerous and give an insight into the physics behind each sequence. Some artifacts affect the quality of the MRI exam, while others do not affect the diagnostic quality but may be confused with pathology.
When encountering an unfamiliar artifact, it is useful to systematically...
Case
Pony tail causing artifact
Published
27 Nov 2012
75% complete
X-ray
Article
Slice-overlap artifact
The slice-overlap artifact, also known as cross-talk artifact, is a type of MRI artifact, namely, the loss of signal seen in an image from a multi-angle, multi-slice acquisition, as is obtained commonly in the lumbar spine. It should not be confused with cross excitation which although similar i...
Case
Mirror image artifact
Published
28 Dec 2013
94% complete
Ultrasound
Article
X-ray artifacts
X-ray artifacts can present in a variety of ways including abnormal shadows noted on a radiograph or degraded image quality, and have been produced by artificial means from hardware failure, operator error and software (post-processing) artifacts.
There are common and distinct artifacts for fi...
Case
Ring artifact
Published
07 Mar 2014
36% complete
CT
Case
Static electricity
Published
14 Jul 2014
79% complete
X-ray
Article
Anisotropy
Anisotropy is an artifact encountered in ultrasound, notably in muscles and tendons during a musculoskeletal ultrasound. In musculoskeletal applications, the artifact may prompt an incorrect diagnosis of tendinosis or tendon tear.
When the ultrasound beam is incident on a fibrillar structure su...
Article
Ring down artifact
Ring down artifact is a special type of resonance artifact. Its appearance is similar to the ladder-like reverberation of comet-tail artifact, but it is produced by a completely different mechanism.
The artifact is only associated with gas bubbles, and occurs when an ultrasound pulse encounters...
Case
Ring down artifact
Published
23 Sep 2016
47% complete
Annotated image
Case
Craniofacial shotgun pellet injury
Published
25 Oct 2016
84% complete
X-ray
CT
Case
Aliasing artifact causing a spurious cerebellar lesion
Published
24 Oct 2016
92% complete
MRI
Case
Dead pixel artifact
Published
22 Dec 2017
63% complete
X-ray
Case
Susceptibility artifact on brain MRI due to gas bubbles
Published
04 Feb 2018
95% complete
MRI
Case
Calcified ureteric stent
Published
26 Sep 2018
88% complete
Annotated image
X-ray
Article
Spectral broadening (ultrasound)
Spectral broadening is an important artifact in pulsed wave Doppler ultrasound imaging, due to its clinical relevance as a sign of vessel stenosis.
Physics
Spectral broadening is caused by turbulence in blood flow as the normally homogeneous velocity of reflective red blood cells becomes more...
Article
Color bruit artifact
The color bruit or tissue vibration artifact is a type of color Doppler ultrasound artifact which results in color signal overflowing to the perivascular tissues most often caused by stenosis, AV fistulas, or shunts. Thus, this artifact is useful by pinpointing areas of potentially pathological ...