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Digital Imaging

Advanced Mod, digital imaging

QuestionAnswer
- the beam that contains useful or diagnostic information remnant beam
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
Which types of system is more forgiving on technique: digital or analog? Digital
What converts the remnant xray beam exiting the patient into light? intenssifying screen
What is considered the recording device? The film
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
What is the name of the image produced then the latent image is converted? manifest image
The process of assigning numberic values to the signal is called? quantization
Quantization determines what part of the image? Gray levels
What two symbols make up binary language? 0 or 1
What is a bit? short for binary digit and is the numbers used in binary language
What is a string of 8 bits called? byte
What determines the number of gray levels? bit depth
How many shades of gray are available if there are 6 bits? 64
As pixel size used to produce an image decreases, what happens to recorded detail? increases
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)
A term used to refer to the ability of certain materials to respond to excitation and give off light Scintillation
What kind of light is used to scan the receptor plate to extract the image data? red laser light
- complex circuit device that collects electrons emitted from either amorphous selenium or amorphous silicon? thin film transistor
Information patterns that dont add to the diagnostic information within the image are referred to as what? Noise
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
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
Lower frequency equates to what kind of pixel size? and spatial resolution? larger pixel size, lower spatial resolution
If you want higher resolution, what kind of dector needs to be used? flat-panel with smaller del's
What determines the level of spatial resolution for an image receptor? Nyquist frequency
According to the Nyquist theorem, given spatial frequency or resolution, what must you do ? sample the signal at twice the desired sampling frequency
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
What two visual ques determine whether the exposure values are incorrect? Noise and loss of image contrast
What is the visual cue for underexposued image? Noise
What is the visual cue for overexposure? loss of image contrast
If the input phosphor size is reduced, what happens to the output phosphor? remains the same and the image is magnified
Created by: erikasmith28