Study Questions
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| If more than one tissue is contained in a voxel, the CT number is determined by a _____________ of the densities of the contents of the voxel. | weighted average
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| What artifact can occur when more than one tissue type is contained in a voxel? | partial volume averaging
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| What artifact results from the mathematical averaging of various attenuation coefficients from several millimeters of different types of tissue? | partial volume averaging
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| How can we minimize the partial voluming effect? | using thinner slices
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| The edge gradient effect is one of the many causes of ____ artifacts in CT images. | streak
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| Out-of-field artifacts may look like ____ or ____ on CT images. | streaks or shading
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| The severity of the out-of-field artifact depends on what? | amount and density of the anatomy outside the SFOV
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| Which artifact results from a faulty or miscalibrated detector element? | ring artifact
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| If a detector has an offset difference of as little as ___% with neighboring detectors, a ring artifact may result on the images. | 0.1%
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| When might tube arcing occur within the tube? | when the tube vacuum is compromised
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| When might tube arcing occur outside of the tube? | when impurities cause the oil to become electrically conductive
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| Each time the tube arcs, the ____ data for that view is distorted. | projection
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| The spreading of the x-ray photons along the z-direction is responsible for an artifact called what? | cone beam artifact
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