Mosby CT Registry Review Latest Update With 500+ Exam Questions with Verified Answers

Mosby CT Registry Review Latest Update With 500+ Exam Questions with Verified Answers-What is the smallest component of a digital image - pixel How many CT numbers are assigned to each pixel in the image matrix? - One In a CT image, the CT number - 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 - pixel What is an element of the digital image - pixel Which of the following influences the spatial resolution in cardiac CT imaging - *detector size *reconstruction interval *pitch As patient motion increases spatial resolution decreases - TRUE Which is an advantage of using a small focal spot - increased spatial resolution Increasing the CT image matrix from 256x256 to 512x512 will likely improve? - 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? - 1.4 mm Use of a bone filter, as opposed to a soft tissue filter, to reconstruct CT images would likely improve? - Spatial resolution The spatial resolution of a typical CT scanner is on the order of? - 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? - 8.5 When comparing a 512x512 matrix to a 1024x1024 matrix, the 1024x1024 matrix? - 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 - Biannually To improve the high contrast spatial resolution of a CT study, one would increase _____ while keeping all other factors the same. - 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 - Increase the matrix size To improve the high-contrast spatial resolution of a CT study, one could increase ? while keeping all other factors the same? - Matrix size A voxel contains 25% air, 50% water and 25% bone. The CT number for this voxel would be expected to be _____ HU? - 0 How many pixels are contained in a 1,024 matrix image? - D. 1,048,576 MATH 1024 X1024 It is located in a matrix and is a two dimensional representation of a voxel - pixel When CT numbers are calculated for voxels (volume elements) of tissue what is assigned the calculated number and a subsequent shade of gray - pixel What is defined as a picture element or the smallest component of the digital image - pixel A CT scan produces a 512x512 matrix transverse image of a 30 cm diameter FOV. Each pixel is approximately _____ mm on a side. - 0.6 equation: 30cm/512= .058cm convert to mm and its .58 which is approximately 0.6 The ability of a system to define small objects distinctly is referred to as which of the following? - spatial resolution