Items tagged “artefact”

14 results found
Article

Ring artifact

Ring artifacts are a CT phenomenon that occur due to miscalibration or failure of one or more detector elements in a CT scanner. Less often it can also 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

Failure of fat saturation

 Diagnosis certain
A.Prof Frank Gaillard
Published 29 Sep 2008
59% complete
MRI
Case

Double exposure

 Diagnosis not applicable
Dr Morlie L Wang
Published 31 May 2011
38% complete
X-ray
Article

RF overflow artifact

RF overflow artefact cause 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 thi...
Case

Ring artefact

 Diagnosis certain
Dr Omar Giyab
Published 16 Apr 2013
77% complete
CT
Case

Maisonneuve fracture

 Diagnosis certain
Dr Henry Knipe
Published 04 Jun 2013
94% complete
Annotated imageX-ray
Case

Cooling blanket

 Diagnosis not applicable
Dr Jayanth Keshavamurthy
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
RMH Core Conditions
Published 27 Feb 2014
69% complete
X-ray
Case

Pseudo-coin lesion due to button

 Diagnosis almost certain
A.Prof Frank Gaillard
Published 26 May 2014
69% complete
X-ray
Case

Speed displacement artifact

 Diagnosis not applicable
Dr Francesco Priamo
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 mac...
Case

Dead pixel artifact

 Diagnosis not applicable
Benjamin Wilson
Published 22 Dec 2017
60% complete
X-ray
Case

Calcified ureteric stent

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

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