Entry slice phenomenon
Citation, DOI, disclosures and article data
Citation:
Ballinger J, Campos A, Murphy A, Entry slice phenomenon. Reference article, Radiopaedia.org (Accessed on 19 Jan 2025) https://doi.org/10.53347/rID-22004
rID:
22004
Article created:
3 Mar 2013,
J. Ray Ballinger
Disclosures:
At the time the article was created J. Ray Ballinger had no recorded disclosures.
View J. Ray Ballinger's current disclosures
Last revised:
Disclosures:
At the time the article was last revised Arlene Campos had no financial relationships to ineligible companies to disclose.
View Arlene Campos's current disclosures
Revisions:
4 times, by
3 contributors -
see full revision history and disclosures
Sections:
Entry slice phenomenon occurs when unsaturated spins in blood first enter into a slice or slices. It is characterized by the bright signal in a blood vessel (artery or vein) at the first slice that the vessel enters. Usually, the signal is seen on more than one slice, fading with distance. This mechanism is used in a positive fashion to generate flight MR angiograms.
This artifact has been confused with thrombosis with disastrous results. The characteristic location and if necessary, the use of gradient echo flow techniques can be used to differentiate entry slice artifacts from occlusions.
Spatial saturation bands place before the first slice and after the last can be used to eliminate this artifact.
References
- David D. Stark, William G. Bradley. Magnetic Resonance Imaging. (1999) ISBN: 0815185189 - Google Books
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