Diagnostic imaging Flashcards
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What is the typical kilovoltage preset on a dental unit?
a. 110 kV
b. 25 kV
c. 50 kV
d. 70 kV
d
51
Which of the following correctly describes a CT image?
a. A two-dimensional image
b. A matrix of pixel or picture elements
c. A three-dimensional image
d. A matrix of voxels
e. Both c and d
f. Both a and b
e
52
A computer tomography x-ray tube can rotate how many degrees?
a. 270 degrees
b. 180 degrees
c. 360 degrees
d. None, it does not rotate
c
53
When using computed tomography, what Hounsfield unit does blood have?
a. –50 HU
b. 160 HU
c. 80 HU
d. None of these
c
54
The number of detectors that are covered by the x-ray beam in CT scanning is known as which type of field of view?
a. Display field of view
b. Scan field of view
c. Raw data
d. Image data
d
55
Anything below what Hounsfield unit is displayed as black on CT imaging?
a. –750 HU
b. 0 HU
c. 250 HU
d. None; black is not displayed on CT
d
56
Which of the following Hounsfield units on CT imaging appears as white?
a. –755 HU
b. 120 HU
c. 1200 HU
d. 1260 HU
c
57
Modern CT scanners use multislice technology and are able to acquire image slices thinner than which of the following sizes?
a. 10 mm
b. 1 cm
c. 10 cm
d. 1 mm
d
