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CTMT2336 CH 8 EXAM STUDY GUIDE
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CTMT2336 CH 8 EXAM STUDYGUIDE
True or False
The range of CT numbers is the WL. - Answer False
The range of CT numbers is the WW.
True or False
A large WW means a long gray scale. - Answer True
True or False
Through the manipulation of CT numbers of the various tissues, the picture can be
changed to show soft tissues and dense structures such as bone. - Answer True
True or False
The CT number for water is +1000. - Answer False
The midpoint of the range (WL) is 0; this is referred to as a reference point because it
represents water.
True or False
When the WL is centered on the lungs, the image display is optimized for the lungs. -
Answer True
True or False
Windowing is the most common image processing technique in CT. - Answer True
True or False
Multiplanar reconstruction creates three-dimensional images from the transaxial data
set. - Answer False
Multiplanar reconstruction is a computer program that can create coronal, sagittal, and
paraxial images from a stack of contiguous transverse axial scans.
True or False
A narrow WW implies that the transition from black to white will take place over a wide
range of CT numbers. - Answer False
, A narrow WW implies that the transition from black to white will take place over
relatively few CT numbers.
True or False
Windowing is an example of a linear image manipulation technique. - Answer False
Windowing is an example of gray-scale mapping which primarily concerns nonlinear
techniques.
True or False
The created multiplanar reconstruction images are poorer in quality than the obtained
transaxial images. - Answer True
True or False
Image smoothing is an example of a linear image manipulation technique. - Answer True
True or False
Preset window settings allow CT scanners to simultaneously display two different
density ranges (different WW and WL) in order to define two different anatomic areas. -
Answer True
True or False
A WL of -150 Hounsfield units (HU) is appropriate for viewing the lungs. - Answer False
Levels should be centered near the average attenuation of the tissues of interest. Lung
is viewed at a level of -600 to -750 HU.
Which of the following basic visualization tools allows for the mean and standard
deviation within a given ROI?
a. CT histogram
b. Multiple windowing
c. ROI statistics
d. Highlighting - Answer c. ROI statistics
Which of the following optimizes the image display for a particular structure?
a. WL
b. kVp
c. Milliamperage
d. WW - Answer a. WL
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