Intensifying screen
Updates to Synonym Attributes
Updates to Article Attributes
Intensifying screen is used in the cassette to intensify the effect of the X-ray photon by producing more number of light photons. It decreases the mAs required to produce a particluarparticular density and hence decrease the patient dose significantly. In cassettes which use double emulsion films, two screens are used, mounted on two sides of the cassette. In momographymammography, however, single screen is used on the back side and a single emulsion film is used.
Layers
- base
- reflecting layer
- phosphor - absorbs the X-ray photon and convert it to visible light that is recorded by the film
- calcium tungstate (CaWO4) - blue light
- lanthanum oxybromide (LaOBr) - blue light
- gadolinium oxysulfide (Gd2O2S) - green light
- protective layer
Rare earth elements are used in present day screens as they are faster and have higher absorption and conversion effeciencyefficiency:
- gadolinium
- lanthanum
- yttrium
Spectral matching
It is important to note that the color of the light emitted (wavelength) must match the light sensitivity of the film used. This is known as spectral matching.:
- conventional films - sensitive to ultraviolet and blue lights
- orthochromatic films - sensitive to ultraviolet, blue and green lights
-<p><strong>Intensifying screen</strong> is used in the <a title="cassette" href="/articles/cassette">cassette</a> to intensify the effect of X-ray photon by producing more number of light photons. It decreases the mAs required to produce a particluar density and hence decrease the patient dose significantly. In cassettes which use double emulsion films, two screens are used, mounted on two sides of the cassette. In momography, however, single screen is used on the back side and a single emulsion film is used.</p><h5>Layers </h5><ul>- +<p><strong>Intensifying screen</strong> is used in the <a href="/articles/cassette">cassette</a> to intensify the effect of the X-ray photon by producing more number of light photons. It decreases the <a title="mAs" href="/articles/mas">mAs</a> required to produce a particular density and hence decrease the patient dose significantly. In cassettes which use double emulsion films, two screens are used, mounted on two sides of the cassette. In mammography, however, single screen is used on the back side and a single emulsion film is used.</p><h5>Layers </h5><ul>
-<li>phosphor - absorbs X-ray photon and convert it to visible light that is recorded by the film<ul>- +<li>phosphor - absorbs the X-ray photon and convert it to visible light that is recorded by the film<ul>
-</ul><p>Rare earth elements are used in present day screens as they are faster and have higher absorption and conversion effeciency</p><ul>- +</ul><p>Rare earth elements are used in present day screens as they are faster and have higher absorption and conversion efficiency:</p><ul>
-</ul><h5>Spectral matching</h5><p>It is important to note that the color of the light emitted (wavelength) must match the light sensitivity of the film used. This is known as spectral matching.</p><ul>- +</ul><h5>Spectral matching</h5><p>It is important to note that the color of the light emitted (wavelength) must match the light sensitivity of the film used. This is known as spectral matching:</p><ul>
-</ul><p> </p><p> </p>- +</ul>
Unable to process the form. Check for errors and try again.