Items tagged “artefact”

15 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. They occur close to the isocentre of the scan and are usually visible on multiple slices at the same location. They are a common problem in cranial CT. The remedy is ...
Case

Failure of fat saturation

 Diagnosis certain
A.Prof Frank Gaillard
Published 29 Sep 2008
62% complete
MRI
Article

India ink artifact

The so-called india ink artifact also known as the black boundary artifact is an MRI feature seen on out-of-phase imaging and represents signal drop out in voxels that contain both fat and non-fat components. As such it is seen surrounding interfaces, lending the image an appearance as if someon...
Case

Double exposure

 Diagnosis almost certain
Dr Morlie L Wang
Published 31 May 2011
50% complete
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...
Article

Slice-overlap artifact

The slice-overlap artefact, also known as cross-talk artefact, is a name given to 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 in causation, is ...
Case

Maisonneuve fracture

 Diagnosis certain
Dr Henry Knipe
Published 04 Jun 2013
94% complete
X-rayAnnotated image
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. Solution This can b...
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
Article

Speed displacement artifact

Speed displacement 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.  The artifact is due to the image processor's assumption that the velocity of the ultra...
Case

Speed displacement artifact

 Diagnosis not applicable
Dr Francesco Priamo
Published 21 Oct 2014
29% complete
Ultrasound
Case

Ring artefact

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

Cooling blanket

 Diagnosis not applicable
Dr Jayanth Keshavamurthy
Published 09 Jan 2014
54% complete
X-ray
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...

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