Mosby CT Registry Review 2025/2026
Exam Questions and Correct Answers |
New Update
What is the smallest component of a digital image - 🧠ANSWER ✔✔pixel
How many CT numbers are assigned to each pixel in the image matrix? -
🧠ANSWER ✔✔One
In a CT image, the CT number - 🧠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 - 🧠ANSWER ✔✔pixel
What is an element of the digital image - 🧠ANSWER ✔✔pixel
Which of the following influences the spatial resolution in cardiac CT
imaging - 🧠ANSWER ✔✔*detector size
*reconstruction interval
*pitch
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,As patient motion increases spatial resolution decreases - 🧠ANSWER
✔✔TRUE
Which is an advantage of using a small focal spot - 🧠ANSWER
✔✔increased spatial resolution
Increasing the CT image matrix from 256x256 to 512x512 will likely
improve? - 🧠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? - 🧠ANSWER ✔✔1.4 mm
Use of a bone filter, as opposed to a soft tissue filter, to reconstruct CT
images would likely improve? - 🧠ANSWER ✔✔Spatial resolution
The spatial resolution of a typical CT scanner is on the order of? -
🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔8.5
When comparing a 512x512 matrix to a 1024x1024 matrix, the 1024x1024
matrix? - 🧠ANSWER ✔✔Contains four times as many pixels: 1024 x 1024
=1048576 then 512 x 512= 262144...then divide 1048576 /262144 = 4
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,High contrast spatial resolution and low contrast resolution are typically
measured baseline and ? thereafter - 🧠ANSWER ✔✔Biannually
To improve the high contrast spatial resolution of a CT study, one would
increase _____ while keeping all other factors the same. - 🧠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 - 🧠ANSWER ✔✔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? - 🧠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? - 🧠ANSWER ✔✔0
How many pixels are contained in a 1,024 matrix image? - 🧠ANSWER
✔✔D. 1,048,576
MATH 1024 X1024
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, It is located in a matrix and is a two dimensional representation of a voxel -
🧠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 -
🧠ANSWER ✔✔pixel
What is defined as a picture element or the smallest component of the
digital image - 🧠ANSWER ✔✔pixel
A CT scan produces a 512x512 matrix transverse image of a 30 cm
diameter FOV. Each pixel is approximately _____ mm on a side. -
🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔spatial resolution
Which of the following terms is/are commonly used to describe a CT
scanner's ability to differentiate objects with similar linear attenuation
coeffiecents - 🧠ANSWER ✔✔*spatial resolution
*sensitivity
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
Exam Questions and Correct Answers |
New Update
What is the smallest component of a digital image - 🧠ANSWER ✔✔pixel
How many CT numbers are assigned to each pixel in the image matrix? -
🧠ANSWER ✔✔One
In a CT image, the CT number - 🧠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 - 🧠ANSWER ✔✔pixel
What is an element of the digital image - 🧠ANSWER ✔✔pixel
Which of the following influences the spatial resolution in cardiac CT
imaging - 🧠ANSWER ✔✔*detector size
*reconstruction interval
*pitch
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
,As patient motion increases spatial resolution decreases - 🧠ANSWER
✔✔TRUE
Which is an advantage of using a small focal spot - 🧠ANSWER
✔✔increased spatial resolution
Increasing the CT image matrix from 256x256 to 512x512 will likely
improve? - 🧠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? - 🧠ANSWER ✔✔1.4 mm
Use of a bone filter, as opposed to a soft tissue filter, to reconstruct CT
images would likely improve? - 🧠ANSWER ✔✔Spatial resolution
The spatial resolution of a typical CT scanner is on the order of? -
🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔8.5
When comparing a 512x512 matrix to a 1024x1024 matrix, the 1024x1024
matrix? - 🧠ANSWER ✔✔Contains four times as many pixels: 1024 x 1024
=1048576 then 512 x 512= 262144...then divide 1048576 /262144 = 4
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
,High contrast spatial resolution and low contrast resolution are typically
measured baseline and ? thereafter - 🧠ANSWER ✔✔Biannually
To improve the high contrast spatial resolution of a CT study, one would
increase _____ while keeping all other factors the same. - 🧠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 - 🧠ANSWER ✔✔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? - 🧠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? - 🧠ANSWER ✔✔0
How many pixels are contained in a 1,024 matrix image? - 🧠ANSWER
✔✔D. 1,048,576
MATH 1024 X1024
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
3
, It is located in a matrix and is a two dimensional representation of a voxel -
🧠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 -
🧠ANSWER ✔✔pixel
What is defined as a picture element or the smallest component of the
digital image - 🧠ANSWER ✔✔pixel
A CT scan produces a 512x512 matrix transverse image of a 30 cm
diameter FOV. Each pixel is approximately _____ mm on a side. -
🧠ANSWER ✔✔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? - 🧠ANSWER ✔✔spatial resolution
Which of the following terms is/are commonly used to describe a CT
scanner's ability to differentiate objects with similar linear attenuation
coeffiecents - 🧠ANSWER ✔✔*spatial resolution
*sensitivity
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
4
