Items tagged “artefact”
17 results found
Case
Failure of fat saturation
Published
29 Sep 2008
59% complete
MRI
Case
Double exposure
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
Published
16 Apr 2013
74% complete
CT
Case
Maisonneuve fracture
Published
04 Jun 2013
94% complete
Annotated image
X-ray
Case
Cooling blanket
Published
09 Jan 2014
88% 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
Published
27 Feb 2014
69% complete
X-ray
Case
Pseudo-coin lesion due to button
Published
26 May 2014
69% complete
X-ray
Case
Speed displacement artifact
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
Published
22 Dec 2017
63% complete
X-ray
Case
Calcified ureteric stent
Published
26 Sep 2018
88% complete
Annotated image
X-ray
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...
Case
Hair braid artifact
Published
25 Nov 2021
74% complete
X-ray
Case
Beam hardening streaking artefact
Published
30 Dec 2023
95% complete
CT
Case
Pseudo-stricture of the extrahepatic bile duct due to pulsatile hepatic artery artefact
Published
15 Jan 2024
95% complete
MRI