Output phosphor
Last revised by Raymond Chieng on 28 Feb 2023
Citation, DOI, disclosures and article data
Citation:
MacManus D, Chieng R, Jones J, et al. Output phosphor. Reference article, Radiopaedia.org (Accessed on 07 Oct 2024) https://doi.org/10.53347/rID-74262
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74262
Article created:
13 Feb 2020,
Daniel MacManus
Disclosures:
At the time the article was created Daniel MacManus had no recorded disclosures.
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Last revised:
28 Feb 2023,
Raymond Chieng ◉
Disclosures:
At the time the article was last revised Raymond Chieng had no financial relationships to ineligible companies to disclose.
View Raymond Chieng's current disclosures
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The output phosphor is a component of the image intensifier in fluoroscopic systems that converts the energy from the electrons into light photons. In an II, the large number of light photons produced are subsequently captured by various imaging devices to produce a visible image.
Composition
Output phosphor is composed of a fluorescent compound (known as P20) made of silver-activated zinc cadmium sulphide (ZnCdS:Ag) particles 2. The output phosphor layer is very thin (4-8 μm) and plated directly on the glass output window of the image intensifier:
electrons that strike the output phosphor result in the emission of a large number of light photons (~2000 luminescent photons are generated for every 25keV accelerated electron)
the emission spectrum of these light photons is around 530nm (green light) – this matches well the sensitivity of most orthochromatic film and video targets
the luminescence decay time of the output phosphor determines the temporal resolution of the image intensifier
References
- 1. Jerrold T. Bushberg, John M. Boone. The Essential Physics of Medical Imaging. (2012) ISBN: 9780781780575
- 2. Wang J & Blackburn T. The AAPM/RSNA Physics Tutorial for Residents. Radiographics. 2000;20(5):1471-7. doi:10.1148/radiographics.20.5.g00se181471 - Pubmed
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