DENT 1050 Chapter 3 Flashcards
In dental radiography, the quality of the x-ray beam is controlled by:
a. kilovoltage peak
b. milliamperage
c. exposure time
d. source-to-receptor distance
a. kilovoltage peak
Identify the kilovoltage range for most dental x-ray machines:
a. 50-60 kV
b. 60 to 70 kV
c. 65 to 70 kV
d. greater than 100 kV
c. 65 to 70 kV
A higher kilovoltage produces x-rays with:
a. greater energy levels
b. shorter wavelengths
c. more penetrating ability
d. all of the above
d. all of the above
Identify the unit of measurement used to describe the amount of electric current flowing through the x-ray tube:
a. volt
b. ampere
c. kilovoltage peak
d. force
b. ampere
Radiation produced with high kilovoltage results in:
a. short wavelengths
b. long wavelengths
c. less penetrating radiation
d. lower energy levels
a. short wavelengths
In dental radiography, the quantity of radiation produced is controlled by:
a. kilovoltage peak
b. milliamperage
c. exposure time
d. both b and c
d. both b and c
Increasing milliamperage results in an increase in:
a. temperature of the filament
b. mean energy of the beam
c. number of x-rays produced
d. both a and c
d. both a and c
Identify the milliamperage range for dental radiography:
a. 1 to 5 mA
b. 4 to 10 mA
c. 7 to 15 mA
d. greater than 15 mA
c. 7 to 15 mA
The overall blackness or darkness of an image is termed:
a. contrast
b. density
c. overexposure
d. polychromatic
b. density
If kilovoltage is decreased with no other variations in exposure factors, the resultant image will:
a. appear lighter
b. appear darker
c. remain the same
d. either a or b
a. appear lighter
Identify the term that describes how dark and light areas are differentiated on an image:
a. contrast
b. density
c. intensity
d. polychromatic
a. contrast
A radiograph that has many light and dark areas with few shades of gray is said to have:
a. high density
b. low density
c. high contrast
d. low contrast
c. high contrast
The radiograph described in question 12 was produced with:
a. low kilovoltage
b. high kiloboltage
c. low milliamperage
d. high milliamperage
a. low kilovoltage
Increasing milliamperage alone results in an image with:
a. high contrast
b. low contrast
c. increased density
d. decreased density
c. increased density
A diagnostic image is produced using 90 kVp and 0.25 second. What exposure time is needed to produce the same image at 75 kVp?
a. 0.50 second
b. 0.75 second
c. 1.00 second
d. 1.25 second
a. 0.50 second
when kVp is decreased by 15, exposure time should be doubled.
A diagnostic image is produced using 10 mA and 0.45 second. What exposure time is needed to produce the same image at 15 mA?
a. 0.25 second
b. 0.30 second
c. 0.45 second
d. 0.50 second
b. 0.30 second
milliamperes x exposure time (sec) = mAs
10 mA x 0.45 seconds = 4.5 mAs;
15 mA x ??? seconds = 4.5 mAs;
4.5/15 = 0.30
