ARRT registry review covering image acquisition and evaluation content area.
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| The chief advantages of SF imaging | high spatial resolution and uniformity in image appearance
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| Any combination of mA and time that will produce a given mAs will produce identical receptor exposure | reciprocity law
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| The intensity of light at a particular distance from its source is inversely proportional to the square of the distance | inverse square law
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| As distance is decreased, the intensity of the x-ray beam | increases
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| As kV is ____________, more electrons are driven to the anode with greater speed and energy | increased
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| Responsible for most of the scattered radiation that reaches the IR | Compton scatter
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| The single most important way to reduce the production of scattered radiation | collimation
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| A device that functions to absorb a large percentage of scattered radiation before it reaches the IR | grid
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| The addition of a grid must be accompanied by an ______ in mAs | increase
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| Angulation against the lead strips causes | grid cutoff
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| Lateral decentering against a grid causes | uniform loss of exposure
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| General radiographic fixed equipment usually uses which grid | 10:1 or 12:1
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| Total primary bream filtration | 2.5-mm Al
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| Filtration increases | the overall average energy of the beam
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| Example of destructive conditions | osteoporosis, necrosis, emphysema
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| Example of additive conditions | ascites, Paget's, atelectasis
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| kV affects the ___________ of the x-ray beam | quality and quantity
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| To double or halve the receptor exposure, the kV can be increased or decreased by __% | 15%
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| Used to provide more uniform radiographic density when imaging structures having widely different attenuation coefficients | compensating filters
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| Two-dimensional picture element | pixel
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| the number of bits per pixel and identifies the values of gray | bit depth
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| a graphic representation of pixel value distribution demonstrating the number of pixels and their value | histogram
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| controls the shades of gray | window width
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| controls brightness | window level
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| The ______ the contrast resolution, the better the ability to see similar adjacent gray shades | higher
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| When there are just a few densities, with noticeable difference between them, radiographic contrast is ___ or ______ scale | high; short
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| When there are many shades of densities with only slight difference between them, contrast is ___ or _____ scale | low; long
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| What is particularly critical when using AEC | positioning and centering
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| ___________ improves with smaller pixel size, smaller pixel pitch, and larger image matrix | spatial resolution
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| Anything that interferes with visualization of the image we wish to see | noise
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