Mosby CT Registry Review Key Questions with
100% Correct Answers.
Terms in this set (503)
What is the smallest pixel
component of a digital
image
How many CT numbersOne
are assigned to each pixel in
the image matrix?
In a CT image, the CT Of a material is dependent on its linear attenuation coefficient
number
Each two-dimensional pixel
square of data that make up
the CT image is called a
What is an element of the pixel
digital image
Which of the following *detector size
influences the spatial *reconstruction interval
resolution in cardiac CT
*pitch
imaging
As patient motion increases TRUE
spatial resolution decreases
increased spatial resolution
Which is an advantage of
using a small focal spot
,Increasing the CT image High-contrast spatial resolution
matrix from 256x256 to
512x512 will likely improve?
The practical limiting spatial 1.4 mm
resolution of a CT scanner is
3.6 lp/cm. What size object
does this correspond to?
Use of a bone filter, as Spatial resolution
opposed to a soft tissue
filter, to reconstruct CT
images would likely
improve?
The spatial resolution of a 1 mm
typical CT scanner is on the
order of?
A 512 x 512 matrix CT 8.5
image over a 30-cm field of
view could show a spatial
resolution of no better than
? lp/cm?
When comparing a Contains four times as many pixels: 1024 x 1024
512x512 matrix to a =1048576 then 512 x 512= 262144...then divide 1048576
1024x1024 matrix, the /262144 = 4
1024x1024 matrix?
Biannually
High contrast spatial
resolution and low contrast
resolution are typically
measured baseline and ?
thereafter
,To improve the high contrast Matrix size (128x128 to 512x512)
spatial resolution of a CT
study, one would increase
_____ while keeping all
other factors the same.
A radiologist wants to Increase the matrix size
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
To improve the highcontrast Matrix size
spatial resolution of a CT
study, one could increase ?
while keeping all other
factors the same?
A voxel contains 25% air, 0
50% water and 25% bone.
The CT number for this
voxel would be expected to
be _____ HU?
How many pixels are D. 1,048,576
contained in a 1,024 matrix
image?
MATH 1024 X1024
pixel
It is located in a matrix and
is a two dimensional
representation of a voxel
, When CT numbers are pixel
calculated for voxels (volume
elements) of tissue what is
assigned the calculated
number and a subsequent
shade of gray
What is defined as a picture pixel
element or the smallest
component of the digital
image
A CT scan produces a 0.6 equation: 30cm/512= .058cm convert to mm and its
512x512 matrix transverse .58 which is approximately 0.6
image of a 30 cm diameter
FOV. Each pixel is
approximately _____ mm on
a side.
The ability of a system to spatial resolution
define small objects
distinctly is referred to as
which of the following?
Which of the following terms *spatial resolution
is/are commonly used to *sensitivity
describe a CT scanner's ability
to differentiate objects with
similar linear attenuation
coeffiecents
Which of the following *patient size
factors have an affect on *slice thickness
contrast resolution
*pixel size
*mAs/dose
FALSE
As mAs/dose increases
contrast resolution
decreases
100% Correct Answers.
Terms in this set (503)
What is the smallest pixel
component of a digital
image
How many CT numbersOne
are assigned to each pixel in
the image matrix?
In a CT image, the CT Of a material is dependent on its linear attenuation coefficient
number
Each two-dimensional pixel
square of data that make up
the CT image is called a
What is an element of the pixel
digital image
Which of the following *detector size
influences the spatial *reconstruction interval
resolution in cardiac CT
*pitch
imaging
As patient motion increases TRUE
spatial resolution decreases
increased spatial resolution
Which is an advantage of
using a small focal spot
,Increasing the CT image High-contrast spatial resolution
matrix from 256x256 to
512x512 will likely improve?
The practical limiting spatial 1.4 mm
resolution of a CT scanner is
3.6 lp/cm. What size object
does this correspond to?
Use of a bone filter, as Spatial resolution
opposed to a soft tissue
filter, to reconstruct CT
images would likely
improve?
The spatial resolution of a 1 mm
typical CT scanner is on the
order of?
A 512 x 512 matrix CT 8.5
image over a 30-cm field of
view could show a spatial
resolution of no better than
? lp/cm?
When comparing a Contains four times as many pixels: 1024 x 1024
512x512 matrix to a =1048576 then 512 x 512= 262144...then divide 1048576
1024x1024 matrix, the /262144 = 4
1024x1024 matrix?
Biannually
High contrast spatial
resolution and low contrast
resolution are typically
measured baseline and ?
thereafter
,To improve the high contrast Matrix size (128x128 to 512x512)
spatial resolution of a CT
study, one would increase
_____ while keeping all
other factors the same.
A radiologist wants to Increase the matrix size
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
To improve the highcontrast Matrix size
spatial resolution of a CT
study, one could increase ?
while keeping all other
factors the same?
A voxel contains 25% air, 0
50% water and 25% bone.
The CT number for this
voxel would be expected to
be _____ HU?
How many pixels are D. 1,048,576
contained in a 1,024 matrix
image?
MATH 1024 X1024
pixel
It is located in a matrix and
is a two dimensional
representation of a voxel
, When CT numbers are pixel
calculated for voxels (volume
elements) of tissue what is
assigned the calculated
number and a subsequent
shade of gray
What is defined as a picture pixel
element or the smallest
component of the digital
image
A CT scan produces a 0.6 equation: 30cm/512= .058cm convert to mm and its
512x512 matrix transverse .58 which is approximately 0.6
image of a 30 cm diameter
FOV. Each pixel is
approximately _____ mm on
a side.
The ability of a system to spatial resolution
define small objects
distinctly is referred to as
which of the following?
Which of the following terms *spatial resolution
is/are commonly used to *sensitivity
describe a CT scanner's ability
to differentiate objects with
similar linear attenuation
coeffiecents
Which of the following *patient size
factors have an affect on *slice thickness
contrast resolution
*pixel size
*mAs/dose
FALSE
As mAs/dose increases
contrast resolution
decreases
