Unit 4 Image Acquisition and Evaluation
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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| When a structure is angled within the body and not parallel to the IR | Foreshortened
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| Occurs when x-ray tube is angled | Elongation
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| When image details placed away from the path of CR will be exposed to more divergent rays | Rotation distortion
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| The smaller the focal spot, the _______ the geometrically recorded detail. | Better
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| The finite area on the tungsten target that is actually bombarded by electrons from the filament. | Actual Focal Spot
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| The foreshortened size of the focus as it is projected down toward the IR is | The Effective Focal Spot
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| In 1986, Thomas Edison developed the _______ ______ intensifying screen that reduced the required exposure to a fraction of that needed without screens. | Calcium Tungstate
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| List rare earth phosphors: | Gadolinium, lanthanum, and yttrium
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| A particular phosphor's ability to absorb x-ray energy and convert it to fluorescent light energy | Conversion Efficiency (CE)
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| Phosphors with a _____ atomic number have a greater likelihood of interacting with and x-ray photon and therefore possess a greater speed. | High
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| Calcium tungstate emits _______ fluorescence. | Blue
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| Rare earth screens emit ________ fluorescence. | Blue or green
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| Refers to luminescence from fluoroscopic screen phosphors | Phosphorescence
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| Phosphors used in fluoroscopy | cesium iodide and zinc cadmim sulfide
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| As phosphor size increases, more surface area is available for x-ray photon capture, resulting in an _________ in screen speed. | Increase
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| Screen speed and phosphor layer are _______ related. | directly
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| Slower (detail) screens are commonly used for _______ exams. | Extremity
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| Faster screens are used for ________ _________. | general radiography
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| A related problem with screens and resolution. | Quantum mottle
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| Most laser film must be handled | in total darkness
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| Windowing describes the practice of | changing the image contrast and/or density
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| Unopened boses of film should be stored away from radiation and | in vertical position
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| The purpose of automatic processor's transport system is to | move the film and change its direction
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| Misalignment of the tube-part-IR relationship results in | Shape distortion
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| Small cresent-shaped artifacts on the processed x-ray film usually are a result of | Acute bending of the film before or after exposure
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| Using a 48 inch SID, how much OID must be introduced to magnify an object 2 times? | 24 inches
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| The direction of the electron travel in the x-ray tube is | Cathode to anode
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| For the same FOV, spatial resolution will be improved using | a larger matrix
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| The reduction in x-ray photon intensity as the photon passes through material is called | Attenuation
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