DENT 1050 Chapter 3 Flashcards Preview

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Flashcards in DENT 1050 Chapter 3 Deck (40):
1

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

2

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

3

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

4

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

5

Radiation produced with high kilovoltage results in:
a. short wavelengths
b. long wavelengths
c. less penetrating radiation
d. lower energy levels

a. short wavelengths

6

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

7

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

8

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

9

The overall blackness or darkness of an image is termed:
a. contrast
b. density
c. overexposure
d. polychromatic

b. density

10

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

11

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

12

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

13

The radiograph described in question 12 was produced with:
a. low kilovoltage
b. high kiloboltage
c. low milliamperage
d. high milliamperage

a. low kilovoltage

14

Increasing milliamperage alone results in an image with:
a. high contrast
b. low contrast
c. increased density
d. decreased density

c. increased density

15

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.

16

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

17

The total energy contained in the x-ray beam in a specific area at a given time is termed:
a. kilovoltage peak
b. beam quality
c. intensity
d. milliampere-second

c. intensity

18

Increasing which of these four exposure controls will increase the intensity of the x-ray beam: (1) kilovoltage, (2) milliamperage, (3) exposure time, (4) source-to-receptor distance?
a. 1 and 2
b. 2 and 3
c. 1, 2, and 3
d. 1, 2, 3, and 4

c. 1, 2, and 3

19

The length of the position-indicating device is changed from 16 inches to 8 inches. The resultant intensity of the beam will be:
a. four times as intense
b. twice as intense
c. half as intense
d. one fourth as intense

a. four times as intense

20

The half-value layer is the amount of:
a. lead that restricts the diameter of the beam by half
b. copper needed to cool the anode
c. aluminum needed to reduce scatter radiation by half
d. aluminum needed to reduce x-ray beam intensity by half

d. aluminum needed to reduce x-ray beam intensity by half

21

Amperage

define

22

Ampere (A)

define

23

Contrast

define

24

Density

define

25

Exposure time

define

26

Half-value layer (HVL)

define

27

Impulse

define

28

Intensity (of x-ray beam)

define

29

Inverse square law

define

30

Kilovolt (kV)

define

31

Kilovoltage

define

32

Kilovoltage peak (kVp)

define

33

Milliamperage

define

34

Milliampere (mA)

define

35

Milliampere-seconds (mAs)

define

36

Polychromatic x-ray beam

define

37

Quality (of x-ray beam)

define

38

Quantity (of x-ray beam)

define

39

Volt (V)

define

40

Voltage

define (speed of the energy wave)