Advanced Mod, digital imaging
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| - the beam that contains useful or diagnostic information | remnant beam
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| A digital imaging system has a large dynamic range. What does this mean? | the digital image receptor responds to a wide range of exposure values to create diagnostic images
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| Which types of system is more forgiving on technique: digital or analog? | Digital
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| What converts the remnant xray beam exiting the patient into light? | intenssifying screen
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| What is considered the recording device? | The film
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| The image created on the film directly after exposure that is not yet visible to the human eye is known as what? | The latent image
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| What is the name of the image produced then the latent image is converted? | manifest image
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| The process of assigning numberic values to the signal is called? | quantization
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| Quantization determines what part of the image? | Gray levels
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| What two symbols make up binary language? | 0 or 1
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| What is a bit? | short for binary digit and is the numbers used in binary language
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| What is a string of 8 bits called? | byte
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| What determines the number of gray levels? | bit depth
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| How many shades of gray are available if there are 6 bits? | 64
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| As pixel size used to produce an image decreases, what happens to recorded detail? | increases
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| What are the 4 types of digital image receptors? | Photostimulable phosphor (PSP)
flat panel with thin film transistor (TFT)charged coupled device (CCD)
complementary metal oxide semiconductor (CMOS)
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| A term used to refer to the ability of certain materials to respond to excitation and give off light | Scintillation
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| What kind of light is used to scan the receptor plate to extract the image data? | red laser light
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| - complex circuit device that collects electrons emitted from either amorphous selenium or amorphous silicon? | thin film transistor
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| Information patterns that dont add to the diagnostic information within the image are referred to as what? | Noise
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| Which type of receptors resond to lower light levels from a scintillator than other types of receptors, making them suitable for low-dose imaging? | CCD, charger coupling devices
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| What is DQE? | detective quantum efficiency, a measure of an image receptor's ability to create an output signal that accurately represents te input signal of the xray beam that exits a patient
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| Lower frequency equates to what kind of pixel size? and spatial resolution? | larger pixel size, lower spatial resolution
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| If you want higher resolution, what kind of dector needs to be used? | flat-panel with smaller del's
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| What determines the level of spatial resolution for an image receptor? | Nyquist frequency
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| According to the Nyquist theorem, given spatial frequency or resolution, what must you do ? | sample the signal at twice the desired sampling frequency
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| What type of receptor can produce an image that appears acceptable on a display monitor, but was produced at 50% underexposure or up to 100% overexposure? | digital receptor
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| What two visual ques determine whether the exposure values are incorrect? | Noise and loss of image contrast
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| What is the visual cue for underexposued image? | Noise
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| What is the visual cue for overexposure? | loss of image contrast
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| If the input phosphor size is reduced, what happens to the output phosphor? | remains the same and the image is magnified
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