Digital Radiography
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What does SPR stand for? | show 🗑
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| show | 3rd
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| show | positioning of a FOV
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| show | What captures the x-ray photon
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| show | A photostimulable phosphor
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| show | Cesium iodide, gadolinium oxysulfide, amorphouse selenium
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| show | What transfers the x-ray generated signal for collection.
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| show | Lens, fiber optics, contact layer, amorphous selenium
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| What is the collection element? | show 🗑
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| What kind of devices can collect the signal? | show 🗑
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| show | Light sensitive device that collects photons
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| show | Charge sensitive device that collects electrons.
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| show | Charge-couple device
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| What does TFT stand for? | show 🗑
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| What are the two types of Indirect DR? | show 🗑
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| show | Phosphor that converts x-rays to light.
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| show | Cesium iodide
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| What is a charge-coupled device? | show 🗑
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| What are charge-coupled devices used in place of? | show 🗑
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| show | 1-2 cm in size
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| what material are charge-couple devices based off of? | show 🗑
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| What is the process for Indirect DR using a scintillator and CCD? | show 🗑
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| What is the process for Indirect DR using a scintillator, and TFT? | show 🗑
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| show | Electronic component that includes the readout, charge collector, "Thin film" of an active semiconductor
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| TFTS act as _______ that allow the pixels to change state rapidly? | show 🗑
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| Because TFTs act as individual switches that allow pixels to change state rapidly, what does the allow the pixel to do? | show 🗑
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| What is Direct Radiography (DR)? | show 🗑
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| show | Indirect Capture and Direct Capture
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| show | Converts x-rays > light > electronic/digital signal
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| What is the process of Direct capture? | show 🗑
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| show | Charge coupled device (linear response curve); Cesium iodide/ charge-coupled device ; cesium iodide and amorphous silicone; Amorphous selenium; Barium Fluorhalide with Europium phosphor CR.
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| show | A device for the movement of an electrical charge
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| 3 Qualities of a charge-coupled device? | show 🗑
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| show | Unrelated
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| Charge coupled device can be used in both ____ and _____ capture | show 🗑
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| Cesium iodide/Charge coupled device is used in what kind of capture? | show 🗑
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| The CsI phosphor absorbs the x-ray photons and transmits scintillation light to the CCD by way of ______? | show 🗑
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| Cesium Iodide/Amorphous Silicone is used in what kind of capture? | show 🗑
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| What is amorphous silicone? | show 🗑
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| Cesium Iodide/amorphouse silicone has high ______? | show 🗑
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| For CsI/Amoruphous silicone, _______ and ________ are imbedded in each pixel | show 🗑
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| With CsI/amorphouse silicone, what captures the x-ray photons and transmits scintillation light to the collection element (TFT)? | show 🗑
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| What is scintillation? | show 🗑
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| show | semiconductor
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| show | charge
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| show | closed; charge
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| The captured charge from TFT is _______ to the x-ray exposure received to the "Dexel". | show 🗑
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| show | It opens and electric charge flows to the charge amplifier.
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| How is DEXEL arranged? | show 🗑
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| DEXEL includes what components? | show 🗑
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| show | 80
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| ______% of DEXEL is for the components. Called what? | show 🗑
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| show | A farm plot. Have to have fields and the barn.
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| show | Direct
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| show | scintillation phosphor.
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| The a-Se is what both elements? | show 🗑
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| show | directly converted into a charge.
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| show | high sensitivity and wide dynamic range; responds to a large variety of light energies; allows lower techniques to be used.
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| show | Several CCD's must be tiled together to cover the detector array...leaving seams where light cannot be detected...overcome using a software interpolation termed "flat-field correction"
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| show | The X-ray collection element?
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| show | "flat panel detector"
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| What is a TFT: | show 🗑
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| show | in a network of dexels (detector elements)
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| Each dexel contains what? | show 🗑
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| How does TFT function in image acquisition? | show 🗑
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| show | Located outside the detecter; Converts charge to a digital signal.
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| show | the sensitivity and ability of dexels to convert x-ray photons to a digital signal.
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| How efficient is the fill factor? | show 🗑
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| show | Increased contrast and spatial resolution; high signal-to noise ratios.
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| Components of DR? | show 🗑
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| show | charged electrodes.
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| show | in rows and columns termed an Active Matrix Array (AMA)
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| show | Network of gatelines and datalines; Allows dexels to be read in sequence.
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| What is the Image acquistion process for DR? | show 🗑
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| show | the internal photoelectric effect.
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| show | Draws the electrons and holes to corresponding electrodes.
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| show | the intensity of the irradiation
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| show | 5-10 Volts applied to Se layer; Charge sent to ADC and computer for processing.
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| What does applying voltage to Se layer do? | show 🗑
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| show | 1 million
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| What are the three main steps to digitizing an analog image? | show 🗑
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| show | process of dividing image up into a matrix...each cell becomes a pixel.
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| What does the sampling step do in digitizing an analog image? | show 🗑
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| What does the quantization step of digitizing an analog image do? | show 🗑
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| show | tme, space, and personnel than screen-film radiography.
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| show | capture element, coupling element, and collection element.
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| What is the capture element? | show 🗑
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| What is the capture element for CR? | show 🗑
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| What are the capture elements for DR? | show 🗑
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| What is the coupling element? | show 🗑
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| What are examples of coupling elements? | show 🗑
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| show | photodiode, charge-coupled device (CCD) or a thin-film transistor (TFT).
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| show | light photons.
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| show | electrons
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| What element is the CCD? | show 🗑
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| What does sensitivity of the CCD refer to? | show 🗑
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| What does dynamic range refer to with CCD? | show 🗑
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| How is CCD different from screen film? | show 🗑
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| show | linear.
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| show | light.
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| show | light.
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| show | pixel limited.
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| show | converted directly into an electronic signal.
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| show | electron hole pairs through direct ionization of selenium.
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| show | a storage capacitor.
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| What is DM | show 🗑
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| What do line spread functions show? | show 🗑
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| no DR system can match screen-film radiagraphy for... | show 🗑
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| show | contrast resolution.
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| What is DMT? | show 🗑
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| show | contrast resolution.
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| show | Scatter radiation
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| In scanned projection digital radiography, which of the following moves to produce an image? | show 🗑
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| A scanned projection radiograph is... | show 🗑
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| show | detector array
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| show | screen-film
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| show | short exposure time and reduced motion blur.
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| What is unique to direct radiography? | show 🗑
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| An x-ray system used for direct radiography has what? | show 🗑
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| Principal limitation of SPR is what? | show 🗑
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| What could be used as a radiation detector in direct radiography? | show 🗑
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Created by:
Cjenki10