Diagnostic imaging Flashcards
What is the typical kilovoltage preset on a dental unit?
a.110 kV
b.25 kV
c.50 kV
d.70 kV
d
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
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
When using computed tomography, what Hounsfield unit does blood have?
a.–50 HU
b.160 HU
c.80 HU
d.None of these
c
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
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
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
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
