Computed Tomography Flashcards
1
Q
Degenerative changes in disk causing radiolucent gas
A
Vacuum sign
2
Q
Dense structures appear such as cortical bone appear:
A
white
3
Q
Cancellous bone appears:
A
gray
4
Q
Pixel/slice is how many mm thick
A
.1-10mm thick
5
Q
A voxel containing different tissues undergoes:
A
volume averaging- an averaging of all the tissue densities
6
Q
Disadvantages of volume averaging
A
Loss of contrast resolution
7
Q
How to solve disadvantages of volume averaging
A
Thinner slices: less affected by averaging and have better contrast
8
Q
Axial image represents what kind of slice
A
transverse
-views looking caudocephalad looking upward
9
Q
sagittal images viewed from:
A
left to right
10
Q
Refers to the range of radiodensities
A
Windowing
11
Q
Humans can distinguish how many shades of gray
A
32
