Anatomy > EXAM > Mosby CT Registry EXAM / COMPLETE SOLUTION (All)

Mosby CT Registry EXAM / COMPLETE SOLUTION

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What is the smallest component of a digital image - ANS-pixel How many CT numbers are assigned to each pixel in the image matrix? - ANS-One In a CT image, the CT number - ANS-Of a material is de... pendent on its linear attenuation coefficient Each two-dimensional square of data that make up the CT image is called a - ANS-pixel What is an element of the digital image - ANS-pixel Which of the following influences the spatial resolution in cardiac CT imaging - ANS-*detector size *reconstruction interval *pitch As patient motion increases spatial resolution decreases - ANS-TRUE Which is an advantage of using a small focal spot - ANS-increased spatial resolution Increasing the CT image matrix from 256x256 to 512x512 will likely improve? - ANS-High-contrast spatial resolution The practical limiting spatial resolution of a CT scanner is 3.6 lp/cm. What size object does this correspond to? - ANS-1.4 mm Use of a bone filter, as opposed to a soft tissue filter, to reconstruct CT images would likely improve? - ANS-Spatial resolution The spatial resolution of a typical CT scanner is on the order of? - ANS-1 mm A 512 x 512 matrix CT image over a 30-cm field of view could show a spatial resolution of no better than ? lp/cm? - ANS-8.5 When comparing a 512x512 matrix to a 1024x1024 matrix, the 1024x1024 matrix? - ANS-Contains four times as many pixels: 1024 x 1024 =1048576 then 512 x 512= 262144...then divide 1048576 /262144 = 4 High contrast spatial resolution and low contrast resolution are typically measured baseline and ? thereafter - ANS-Biannually To improve the high contrast spatial resolution of a CT study, one would increase _____ while keeping all other factors the same. - ANS-Matrix size (128x128 to 512x512) [Show More]

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