Items tagged “artefact”
15 results found










Article
Ring artifact
Ring artifacts are a CT phenomenon that occurs due to 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 scan ...
Case
Failure of fat saturation

Diagnosis certain
Published 29 Sep 2008
59% complete
MRI
Case
Double exposure

Diagnosis not applicable
Published 31 May 2011
38% complete
X-ray
Article
RF overflow artifact
RF overflow artifact causes a nonuniform, washed-out appearance to an image. This artifact occurs when the signal received by the scanner from the patient is too intense to be accurately digitized by the analog-to-digital converter. Autoprescanning usually adjusts the receiver gain to prevent th...
Case
Ring artifact

Diagnosis certain
Published 16 Apr 2013
77% complete
CT
Case
Maisonneuve fracture

Diagnosis certain
Published 04 Jun 2013
94% complete
Annotated imageX-ray
Case
Cooling blanket

Diagnosis not applicable
Published 09 Jan 2014
54% complete
X-ray
Article
CT stair-step artifact
The CT stair-step artifact is found in straight structures which are oriented obliquely with respect to movement of the table and appear around the edges of sagittal and coronal reformatted images when wide collimations and non-overlapping reconstruction intervals are used.
It is also seen in c...
Case
Bilateral nipple shadows
Diagnosis probable
Published 27 Feb 2014
69% complete
X-ray
Case
Pseudo-coin lesion due to button

Diagnosis almost certain
Published 26 May 2014
69% complete
X-ray
Case
Speed displacement artifact

Diagnosis not applicable
Published 21 Oct 2014
25% complete
Ultrasound
Article
Speed displacement artifact
Speed displacement artifact, also known as propagation velocity artifact, is a gray scale ultrasound finding that can be identified as an area of focal discontinuity and displacement of an echo deeper than that its actual position in an imaged structure. Depth determination by an ultrasound mach...
Case
Dead pixel artifact

Diagnosis not applicable
Published 22 Dec 2017
60% complete
X-ray
Case
Calcified ureteric stent

Diagnosis certain
Published 26 Sep 2018
88% complete
X-rayAnnotated image
Article
Oxygen masks
Oxygen masks are commonly visible on chest imaging, as they are generally not removed before the examination is performed.
Radiographic features
Plain radiograph
Oxygen masks are of soft-tissue density and may mimic lung lesions. A nebuliser mask with liquid in its cup causing an air-fluid l...