Mosby CT Registry Review Updated With 500+ Questions with 100% Correct and Verified Answers
Mosby CT Registry Review Updated With 500+ Questions with 100% Correct and Verified Answers 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 dependent 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) A radiologist wants to improve the high-contrast spatial resolution of anatomy which he/she is examining by CT. The change which would best lead to this improvement is - ANS: Increase the matrix size
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