Computed Tomography Exam 2026 Edition Actual Questions And
Correct Detailed Answers
CT basics-CORRECT ANSWER=·Essentially an x-ray tube that rotates round the pt
·Table moves, feeding pt into the gantry
·Each large is data collected as a series of slices
o Each slice is divided into voxels (volume elements)
Each sweep of the source-detector around the body during CT is called a_.- CORRECT
ANSWER=translation
Each CT projection records variations in .- CORRECT ANSWER=mass density and effective
atomic number
Each CT projection is.
1.printed on film
2.stored on the computer
3.displayed on the monitor- CORRECT ANSWER=stored on the computer
The cross-sectional anatomy is translated into during CT reconstruction. - CORRECT
ANSWER=amatrix of values
,The first generation of computed tomography used detector (s).- CORRECT
ANSWER=one
The principal drawback of the first-generation CT scanner was the .- CORRECT
ANSWER=long scanning time
What is windowing?- CORRECT ANSWER=Amethod in which the CT image gray scale can be
manipulated in order to enhance different structures of varying tissues
What are the 2 windowing mechanisms?- CORRECT ANSWER=-Window width
-Window level
What is Window Width (WW)? - CORRECT ANSWER=-The range of the CT numbers in the image
- Determines the maximum number of shades of gray that can be displayed on the CT monitor
-Effects contrast
What is Window Level (WL)?- CORRECT ANSWER=-The center or midpoint of the range of CT numbers
-Effects brightness
Wide window widths (400 to 2000 HU) are necessary for ?- CORRECT
ANSWER=Varying body tissues
Narrow window widths (50 to 350 HU) are necessary for ?- CORRECT
ANSWER=Different tissues of similar densities
,What are the effects of WW on image contrast?- CORRECT ANSWER=-As the WW
increases,the contrast decreases
-As the WW decreases, the contrast increases
What are the effects of WL on image brightness?- CORRECT ANSWER=-Moving the WL toward the
higher CT numbers results in a darker image
-Moving the WL toward the lower CT numbers results in a brighter image
What is a multi-slice scanner (MSCT)?- CORRECT ANSWER=-CTsystem equipped with a multiple-row
detector array to simultaneously collect data at different slice locations
-Can scan up to 64 slices
In CT,the attenuated image-forming radiation is detected by what?- CORRECT ANSWER=A solid
state image receptor
What is Helical CT?- CORRECT ANSWER=-Continuous gantry rotation + continuous table feed
- Scan data traces a helical path or spiral around patient
What is Isotropic Imaging?-CORRECTANSWER=2Dpixel in a CT image represents a 3D voxel
Name the 3 types of Data acquisition systems?- CORRECT ANSWER=-Conventional
, -Helical single slice (spiral)
-Multi-slice
What is a Linear Attenuation coefficient?- CORRECT ANSWER=Characterizes how easilya volume of
material can be penetrated by the x-rays
What is a bowtie filter?- CORRECT ANSWER=Used to allow a uniform beam to reach detectors
What occurs with CT filtration?- CORRECT ANSWER=-Removes long wavelength x-rays which
contributes to patient dose
-Shapes the energy distribution across the radiation beam to produce uniform beam hardening
when x-rays pass through the filter and the object causing beam hardening artifacts
What is pitch? What is the formula?- CORRECT ANSWER=Relationship between the patient couch
movement and the x-ray beam collimation and is expressed as a ratio
Pitch=Couch movement each 360 degrees/Slice Thickness
How do different structures appear on CT?- CORRECT ANSWER=-Bone and high density structures,
such as radiopaque contrast media,appear white
- Air and other low density structures appear black
- Fat and organs appear in varying shades of gray
Correct Detailed Answers
CT basics-CORRECT ANSWER=·Essentially an x-ray tube that rotates round the pt
·Table moves, feeding pt into the gantry
·Each large is data collected as a series of slices
o Each slice is divided into voxels (volume elements)
Each sweep of the source-detector around the body during CT is called a_.- CORRECT
ANSWER=translation
Each CT projection records variations in .- CORRECT ANSWER=mass density and effective
atomic number
Each CT projection is.
1.printed on film
2.stored on the computer
3.displayed on the monitor- CORRECT ANSWER=stored on the computer
The cross-sectional anatomy is translated into during CT reconstruction. - CORRECT
ANSWER=amatrix of values
,The first generation of computed tomography used detector (s).- CORRECT
ANSWER=one
The principal drawback of the first-generation CT scanner was the .- CORRECT
ANSWER=long scanning time
What is windowing?- CORRECT ANSWER=Amethod in which the CT image gray scale can be
manipulated in order to enhance different structures of varying tissues
What are the 2 windowing mechanisms?- CORRECT ANSWER=-Window width
-Window level
What is Window Width (WW)? - CORRECT ANSWER=-The range of the CT numbers in the image
- Determines the maximum number of shades of gray that can be displayed on the CT monitor
-Effects contrast
What is Window Level (WL)?- CORRECT ANSWER=-The center or midpoint of the range of CT numbers
-Effects brightness
Wide window widths (400 to 2000 HU) are necessary for ?- CORRECT
ANSWER=Varying body tissues
Narrow window widths (50 to 350 HU) are necessary for ?- CORRECT
ANSWER=Different tissues of similar densities
,What are the effects of WW on image contrast?- CORRECT ANSWER=-As the WW
increases,the contrast decreases
-As the WW decreases, the contrast increases
What are the effects of WL on image brightness?- CORRECT ANSWER=-Moving the WL toward the
higher CT numbers results in a darker image
-Moving the WL toward the lower CT numbers results in a brighter image
What is a multi-slice scanner (MSCT)?- CORRECT ANSWER=-CTsystem equipped with a multiple-row
detector array to simultaneously collect data at different slice locations
-Can scan up to 64 slices
In CT,the attenuated image-forming radiation is detected by what?- CORRECT ANSWER=A solid
state image receptor
What is Helical CT?- CORRECT ANSWER=-Continuous gantry rotation + continuous table feed
- Scan data traces a helical path or spiral around patient
What is Isotropic Imaging?-CORRECTANSWER=2Dpixel in a CT image represents a 3D voxel
Name the 3 types of Data acquisition systems?- CORRECT ANSWER=-Conventional
, -Helical single slice (spiral)
-Multi-slice
What is a Linear Attenuation coefficient?- CORRECT ANSWER=Characterizes how easilya volume of
material can be penetrated by the x-rays
What is a bowtie filter?- CORRECT ANSWER=Used to allow a uniform beam to reach detectors
What occurs with CT filtration?- CORRECT ANSWER=-Removes long wavelength x-rays which
contributes to patient dose
-Shapes the energy distribution across the radiation beam to produce uniform beam hardening
when x-rays pass through the filter and the object causing beam hardening artifacts
What is pitch? What is the formula?- CORRECT ANSWER=Relationship between the patient couch
movement and the x-ray beam collimation and is expressed as a ratio
Pitch=Couch movement each 360 degrees/Slice Thickness
How do different structures appear on CT?- CORRECT ANSWER=-Bone and high density structures,
such as radiopaque contrast media,appear white
- Air and other low density structures appear black
- Fat and organs appear in varying shades of gray
