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Cards In This Set
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Possible results of partial voluming?
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1. decreased sharpness of edges
2. misleading CT numbers
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CT numbers ___ would appear black if a window width of 400 and a window level of -100 are used.
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Below -300
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If a calcification with a CT number of +300 appears pure white on an image, the following could be the ww & wl selected.
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Window level = 0
window width = 500
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_____ is the determinants of CT image quality is responsible for how grainy or speckled a CT image appears.
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Noise
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If a thin slice is used the following would help reduce the apparent image noise?
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Increased mAs
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What controls the # of electrons that flow from the cathode to the anode in the tube.
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MA
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What is an analog-to-digital converter?
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The system component that converts the projection attenuation data into the proper digital form for the array processor.
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What determines the quantity of x-ray photons.
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MA
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What is the main purpose of the detector?
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To capture x-ray photons & convert them to a measurable signal.
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____________ is accomplished by physically blocking x-rays.
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Collimation
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______ is the parameter that affects the contrast of a ct image.
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Kvp
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__________ is the parameter that is responsible for partial volume averaging.
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Slice Thickness
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What determines how penetrating the x-ray beam will be?
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Kvp
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_____ is the voltage potential between the tube cathode & anode while MA ultimately controls the filament current & thus the temp of cathode filament.
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Kv
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What causes scatter radiation?
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Deflections from the original trajectory of an x-ray photon through the pt.
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