Mosby CT Registry Review Exam
Questions And Answers Latest Update
What is the smallest component of a digital image -
correct answer ✅pixel
How many CT numbers are assigned to each pixel in the image
matrix? -
correct answer ✅One
In a CT image, the CT number -
correct answer ✅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 -
correct answer ✅pixel
What is an element of the digital image -
correct answer ✅pixel
Which of the following influences the spatial resolution in cardiac
CT imaging -
correct answer ✅*detector size
*reconstruction interval
*pitch
,Mosby CT Registry Review Exam
Questions And Answers Latest Update
As patient motion increases spatial resolution decreases -
correct answer ✅TRUE
Which is an advantage of using a small focal spot -
correct answer ✅increased spatial resolution
Increasing the CT image matrix from 256x256 to 512x512 will likely
improve? -
correct answer ✅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? -
correct answer ✅1.4 mm
Use of a bone filter, as opposed to a soft tissue filter, to reconstruct
CT images would likely improve? -
correct answer ✅Spatial resolution
The spatial resolution of a typical CT scanner is on the order of? -
correct answer ✅1 mm
,Mosby CT Registry Review Exam
Questions And Answers Latest Update
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? -
correct answer ✅8.5
When comparing a 512x512 matrix to a 1024x1024 matrix, the
1024x1024 matrix? -
correct answer ✅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 -
correct answer ✅Biannually
To improve the high contrast spatial resolution of a CT study, one
would increase _____ while keeping all other factors the same. -
correct answer ✅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 -
correct answer ✅Increase the matrix size
, Mosby CT Registry Review Exam
Questions And Answers Latest Update
To improve the high-contrast spatial resolution of a CT study, one
could increase ? while keeping all other factors the same? -
correct answer ✅Matrix size
A voxel contains 25% air, 50% water and 25% bone. The CT number
for this voxel would be expected to be _____ HU? -
correct answer ✅0
How many pixels are contained in a 1,024 matrix image? -
correct answer ✅D. 1,048,576
MATH 1024 X1024
It is located in a matrix and is a two dimensional representation of a
voxel -
correct answer ✅pixel
When CT numbers are calculated for voxels (volume elements) of
tissue what is assigned the calculated number and a subsequent
shade of gray -
correct answer ✅pixel
Questions And Answers Latest Update
What is the smallest component of a digital image -
correct answer ✅pixel
How many CT numbers are assigned to each pixel in the image
matrix? -
correct answer ✅One
In a CT image, the CT number -
correct answer ✅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 -
correct answer ✅pixel
What is an element of the digital image -
correct answer ✅pixel
Which of the following influences the spatial resolution in cardiac
CT imaging -
correct answer ✅*detector size
*reconstruction interval
*pitch
,Mosby CT Registry Review Exam
Questions And Answers Latest Update
As patient motion increases spatial resolution decreases -
correct answer ✅TRUE
Which is an advantage of using a small focal spot -
correct answer ✅increased spatial resolution
Increasing the CT image matrix from 256x256 to 512x512 will likely
improve? -
correct answer ✅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? -
correct answer ✅1.4 mm
Use of a bone filter, as opposed to a soft tissue filter, to reconstruct
CT images would likely improve? -
correct answer ✅Spatial resolution
The spatial resolution of a typical CT scanner is on the order of? -
correct answer ✅1 mm
,Mosby CT Registry Review Exam
Questions And Answers Latest Update
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? -
correct answer ✅8.5
When comparing a 512x512 matrix to a 1024x1024 matrix, the
1024x1024 matrix? -
correct answer ✅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 -
correct answer ✅Biannually
To improve the high contrast spatial resolution of a CT study, one
would increase _____ while keeping all other factors the same. -
correct answer ✅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 -
correct answer ✅Increase the matrix size
, Mosby CT Registry Review Exam
Questions And Answers Latest Update
To improve the high-contrast spatial resolution of a CT study, one
could increase ? while keeping all other factors the same? -
correct answer ✅Matrix size
A voxel contains 25% air, 50% water and 25% bone. The CT number
for this voxel would be expected to be _____ HU? -
correct answer ✅0
How many pixels are contained in a 1,024 matrix image? -
correct answer ✅D. 1,048,576
MATH 1024 X1024
It is located in a matrix and is a two dimensional representation of a
voxel -
correct answer ✅pixel
When CT numbers are calculated for voxels (volume elements) of
tissue what is assigned the calculated number and a subsequent
shade of gray -
correct answer ✅pixel
