Flat panel detector
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Flat panel detectors (FPD(FPD) are used in direct digital digital radiography (DDR) for conversion of X-rays to light (indirect conversion) or charge (direct conversion) which is read out using thin film transistors (TFT array).
Types
They are of two types:
-
indirect conversion FPDs
- outermost layer is scintillator: phosphor screen (caesium iodide or gadolinium oxysulfide)
- detector: based on
amorphousamorphous silicon photodiode - convert X-rays to light and then to charge (hence called indirect FPDs)
-
direct conversion FPDs
- outermost layer: high voltage bias electrode
- detector: based on amorphous selenium
- convert X-rays to charge directly (hence called direct FPDs)
It is important to note that indirect conversion can also be detected using charge-coupled devices (CCDs). These are small and require optical coupling.
-<p><strong>Flat panel detectors</strong> (FPD) are used in direct digital radiography (DDR) for conversion of X-rays to light (indirect conversion) or charge (direct conversion) which is read out using thin film transistors (TFT array).</p><h5>Types</h5><p>They are of two types:</p><ol>- +<p><strong>Flat panel detectors</strong> (<strong>FPD</strong>) are used in direct digital radiography (DDR) for conversion of X-rays to light (indirect conversion) or charge (direct conversion) which is read out using thin film transistors (TFT array).</p><h5>Types</h5><p>They are of two types:</p><ol>
-<li>detector: based on amorphous silicon photodiode</li>- +<li>detector: based on amorphous silicon photodiode</li>
-<li>detector: based on amorphous selenium </li>- +<li>detector: based on amorphous <a title="Selenium" href="/articles/selenium">selenium</a> </li>
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