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. They occur close to the isocenter of the s...
Case

Mirror image artifact

 Diagnosis certain
The Radswiki
Published 20 Oct 2010
72% complete
Ultrasound
Case

Aliasing artifact

 Diagnosis not applicable
Dr Usman Bashir
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

 Diagnosis almost certain
Dr MT. Niknejad
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...
Article

CT artifacts

CT artifacts are common and can occur for various reasons. Knowledge of these artifacts is important because they can mimic pathology (e.g. partial volume artifact) or can degrade image quality to non-diagnostic levels. CT artifacts can be classified according to the underlying cause of the art...
Case

Mirror image artifact

 Diagnosis certain
Dr Ayush Goel
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

 Diagnosis not applicable
Dr Henry Knipe
Published 07 Mar 2014
36% complete
CT
Case

Static electricity

 Diagnosis certain
Dr Ayush Goel
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

 Diagnosis not applicable
Dr Matt A. Morgan
Published 23 Sep 2016
47% complete
Annotated image
Case

Craniofacial shotgun pellet injury

 Diagnosis certain
Dr Shailaja Muniraj
Published 25 Oct 2016
84% complete
X-rayCT
Case

Aliasing artifact causing a spurious cerebellar lesion

 Diagnosis certain
Dr. Chris O'Donnell
Published 24 Oct 2016
92% complete
MRI
Case

Dead pixel artifact

 Diagnosis not applicable
Benjamin Wilson
Published 22 Dec 2017
63% complete
X-ray
Case

Susceptibility artifact on brain MRI due to gas bubbles

 Diagnosis certain
Dr. Chris O'Donnell
Published 04 Feb 2018
95% complete
MRI
Case

Calcified ureteric stent

 Diagnosis certain
Dr Martin Pike
Published 26 Sep 2018
88% complete
X-rayAnnotated image
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...

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