Entrance phosphor
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- updated 17 Aug 2022:
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The entrance phosphor (or input phosphor) is a component of the image intensifier in fluoroscopic systems that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as caesium iodide activated with sodium (CsI:Na) and coats the entrance surface of the image intensifier. The light produced by the entrance phosphor subsequently travels to a photocathode layer1.
In earlier days Zinc-cadmium sulfide activated with Silver was used as the material for input phosphor, but CsI:Na was subsequently used as it provides better image quality owing to its high packing density, favourable atomic number and vertical orientation of crystals1.
-<p>The <strong>entrance phosphor</strong> (or <strong>input phosphor</strong>) is a component of the <a href="/articles/image-intensifier">image intensifier</a> in <a href="/articles/fluoroscopy">fluoroscopic systems</a> that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as caesium iodide activated with sodium (CsI:Na) and coats the entrance surface of the image intensifier. The light produced by the entrance phosphor subsequently travels to a <a href="/articles/photocathode">photocathode</a> layer.</p><p>In earlier days Zinc-cadmium sulfide activated with Silver was used as the material for input phosphor, but CsI:Na was subsequently used as it provides better image quality owing to its high packing density, favourable atomic number and vertical orientation of crystals.</p>- +<p>The <strong>entrance phosphor</strong> (or <strong>input phosphor</strong>) is a component of the <a href="/articles/image-intensifier">image intensifier</a> in <a href="/articles/fluoroscopy">fluoroscopic systems</a> that converts the energy from x-rays into light photons. It is composed of a fluorescent material such as caesium iodide activated with sodium (CsI:Na) and coats the entrance surface of the image intensifier. The light produced by the entrance phosphor subsequently travels to a <a href="/articles/photocathode">photocathode</a> layer <sup>1</sup>.</p><p>In earlier days Zinc-cadmium sulfide activated with Silver was used as the material for input phosphor, but CsI:Na was subsequently used as it provides better image quality owing to its high packing density, favourable atomic number and vertical orientation of crystals <sup>1</sup>.</p>
References changed:
- 1. Wang J & Blackburn T. The AAPM/RSNA Physics Tutorial for Residents. Radiographics. 2000;20(5):1471-7. <a href="https://doi.org/10.1148/radiographics.20.5.g00se181471">doi:10.1148/radiographics.20.5.g00se181471</a> - <a href="https://www.ncbi.nlm.nih.gov/pubmed/10992034">Pubmed</a>
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