Radiography Essentials for Limited Practice 4th Edition by Bruce W. Long - Test Bank

Radiography Essentials for Limited Practice 4th Edition by Bruce W. Long – Test Bank

 

Instant Download – Complete Test Bank With Answers

 

 

Sample Questions Are Posted Below

 

Chapter 5: X-Ray Production

Test Bank

 

MULTIPLE CHOICE

 

1. The x-ray tube inside the protective housing is made of:

a.	lead.
b.	steel.
c.	aluminum.
d.	Pyrex glass.

 

 

ANS:  D                    REF:   Page 53

 

2. What are the four essential elements required for x-ray production?

a.	A target, a vacuum, an electron source, and a high potential difference
b.	A target, a source of electrons, an inert gas environment, and a high potential difference
c.	A source of electrons, a magnetic field, a resistance-free path, and a target
d.	A source of electrons, an electric field, a circuit, and a target

 

 

ANS:  A                    REF:   Page 53

 

3. The filament of an x-ray tube is made of:

a.	glass.
b.	a coil of copper wire.
c.	a coil of tungsten wire.
d.	a fluorescent tube.

 

 

ANS:  C                    REF:   Page 53

 

4. The target of the x-ray tube is made of:

a.	tungsten.
b.	glass.
c.	stainless steel.
d.	fluorescent phosphors.

 

 

ANS:  A                    REF:   Page 53

 

5. A device for removing long wavelength radiation from the primary x-ray beam is a:

a.	collimator.
b.	rheostat.
c.	rectifier.
d.	filter.

 

 

ANS:  D                    REF:   Page 61

 

6. The “electron cloud” that surrounds the hot cathode is referred to as a:

a.	focusing cup.
b.	photon.
c.	filament.
d.	space charge.

 

 

ANS:  D                    REF:   Page 53

 

7. Free electrons at the cathode that are used for x-ray production come from the:

a.	filament.
b.	target.
c.	anode.
d.	kilovoltage.

 

 

ANS:  A                    REF:   Page 53

 

8. When tungsten atoms are heated, their outermost electrons are moved out of the atom in space. This principle is called:

a.	electromagnetic induction.
b.	variable resistance.
c.	quantum theory.
d.	thermionic emission.

 

 

ANS:  D                    REF:   Page 53

 

9. The anode, or target, of the x-ray tube is ______ charged.

a.	positively
b.	negatively
c.	neutrally
d.	radioactively

 

 

ANS:  A                    REF:   Page 53

 

10. The cathode end of the x-ray tube is ______ charged.

a.	positively
b.	negatively
c.	neutrally
d.	radioactively

 

 

ANS:  B                    REF:   Page 53

 

11. Most x-ray tubes in use today have a standard rotation speed of ______ rpm.

a.	1,500
b.	2,000
c.	3,600
d.	10,000

 

 

ANS:  C                    REF:   Page 57

 

12. What is the principal advantage of a high-speed rotating anode?

a.	More efficient production of x-rays
b.	Increased amount of characteristic radiation produced
c.	Increased amount of bremsstrahlung radiation produced
d.	More efficient heat dissipation

 

 

ANS:  D                    REF:   Page 57

 

13. The greatest portion of the x-ray beam is made up of:

a.	characteristic-produced radiation.
b.	bremsstrahlung-produced radiation.
c.	low-energy electrons.
d.	high-energy electrons.

 

 

ANS:  B                    REF:   Page 54

 

14. Below what kVp level is characteristic radiation no longer produced?

a.	40 kVp
b.	50 kVp
c.	70 kVp
d.	100 kVp

 

 

ANS:  C                    REF:   Page 54

 

15. What is required to move the electron stream rapidly across the x-ray tube?

a.	Magnetic field
b.	High potential difference
c.	Focusing cups
d.	Copper mass in the target

 

 

ANS:  B                    REF:   Page 53

 

16. More than 99% of the energy applied to an x-ray tube is converted into:

a.	bremsstrahlung radiation.
b.	characteristic radiation.
c.	secondary radiation.
d.	heat.

 

 

ANS:  D                    REF:   Page 54

 

17. What percentage of the total energy applied to an x-ray tube target is converted into x-rays?

a.	1%
b.	50%
c.	75%
d.	99%

 

 

ANS:  A                    REF:   Page 54

 

18. Which of the following are the types of radiation produced in the anode?

a.	Thermionic emission and heat
b.	Electromagnetic and thermal
c.	Characteristic and bremsstrahlung
d.	Remnant and scatter

 

 

ANS:  C                    REF:   Page 55

 

19. What type of radiation is produced in the anode by the sudden slowing and directional change of an incoming electron?

a.	Characteristic radiation
b.	Scatter radiation
c.	Bremsstrahlung radiation
d.	Thermionic emission

 

 

ANS:  C                    REF:   Page 54

 

20. What type of radiation is produced when an incoming electron interacts with the K-shell electron in the tungsten atom?

a.	Characteristic radiation
b.	Scatter radiation
c.	Bremsstrahlung radiation
d.	Thermionic emission

 

 

ANS:  A                    REF:   Page 54

 

21. The purpose of rotating the x-ray tube target is to:

a.	create a space charge.
b.	speed up the electrons in the electron stream.
c.	remove long wavelength photons from the x-ray beam.
d.	increase the heat capacity of the anode.

 

 

ANS:  D                    REF:   Page 57

 

22. The degree of angulation of the x-ray tube target will determine the:

a.	effective focal spot.
b.	speed of anode rotation.
c.	number of photons in the x-ray beam.
d.	heat capacity of the anode.

 

 

ANS:  A                    REF:   Page 57

 

23. A smaller effective focal spot produces:

a.	greater tube heat capacity.
b.	lower patient dose.
c.	more characteristic radiation.
d.	greater image sharpness.

 

 

ANS:  D                    REF:   Page 57

 

24. A larger actual focal spot produces:

a.	greater image sharpness.
b.	greater tube heat capacity.
c.	lower patient dose.
d.	more characteristic radiation.

 

 

ANS:  B                    REF:   Page 58

 

25. Which of the following can be found on a dual-focus x-ray tube?
26. Two filaments
27. Two focal spot sizes
28. Two anodes

a.	1 and 2 only
b.	1 and 3 only
c.	2 and 3 only
d.	1, 2, and 3

 

 

ANS:  A                    REF:   Page 55

 

26. The anode heel effect is a phenomenon of x-ray production that results in:

a.	dissipation of anode heat.
b.	filtration of long wavelengths from the x-ray beam.
c.	uneven distribution of radiation within the field.
d.	the production of characteristic radiation.

 

 

ANS:  C                    REF:   Page 59

 

27. Taking into account the anode heel effect when making a recumbent AP radiograph of the femur (thigh bone) on a 14 ´ 17-inch IR at 40 inches SID, the patient should be placed so that the:

a.	head is toward the anode end of the tube.
b.	head is toward the cathode end of the tube.
c.	position is convenient; the anode heel effect is not significant in this case.

 

 

ANS:  B                    REF:   Page 59

 

28. The penetrating power of the x-ray beam is controlled by varying the:

a.	anode angle.
b.	anode speed.
c.	milliamperage.
d.	kilovoltage.

 

 

ANS:  D                    REF:   Page 59

 

29. The current across the x-ray tube is measured in units of:

a.	milliamperes.
b.	kilovolts.
c.	roentgens.
d.	ohms.

 

 

ANS:  A                    REF:   Page 60

 

30. Which of the following occurs when the mA is doubled?
31. The number of x-ray photons decreases by 50%.
32. Radiographic density increases.
33. There are twice as many photons in the x-ray beam.

a.	1 and 2 only
b.	1 and 3 only
c.	2 and 3 only
d.	1, 2, and 3

 

 

ANS:  C                    REF:   Page 60

 

31. The mAs used for an exposure determines the:

a.	wavelength of the resulting x-ray beam.
b.	quantity of radiation in the exposure.
c.	rate at which x-rays are produced.
d.	voltage across the x-ray tube.

 

 

ANS:  B                    REF:   Page 60

 

32. An x-ray exposure is made using the following factors: 400 mA, 0.02 sec, 80 kVp, 40 inches SID, and the large focal spot. What is the mAs for this exposure technique?

a.	0.08 mAs
b.	0.8 mAs
c.	8 mAs
d.	80 mAs

 

 

ANS:  C                    REF:   Page 60

 

33. When exposure time is very short, the time is usually measured in:

a.	milliseconds.
b.	deciseconds.
c.	kiloelectron volts.
d.	angstroms.

 

 

ANS:  A                    REF:   Page 60

 

34. If an exposure time is measured as 35 milliseconds, what is the exposure time in seconds?

a.	0.350 seconds
b.	350 seconds
c.	0.035 seconds
d.	3.5 seconds

 

 

ANS:  C                    REF:   Page 60

 

35. The x-ray beam is made up of many different energy x-rays. This beam is referred to as:

a.	attenuated.
b.	heterogenous.
c.	ionized.
d.	electromagnetic.

 

 

ANS:  B                    REF:   Page 55

 

36. Which of the following statements is true regarding the characteristics of tungsten?

a.	Tungsten has a low melting point.
b.	Tungsten is a very soft metal.
c.	Tungsten is a very unstable element.
d.	Tungsten has a high melting point.

 

 

ANS:  D                    REF:   Page 56

 

37. X-ray equipment capable of producing 70 kVp or more must have how much equivalent aluminum filtration?

a.	0.5 mm Al equivalent
b.	1.0 mm Al equivalent
c.	2.5 mm Al equivalent
d.	3.5 mm Al equivalent

 

 

ANS:  C                    REF:   Page 61

 

38. What is the primary advantage of x-ray beam filtration?

a.	Increases the heat capacity of the x-ray tube
b.	Improves image quality
c.	Lowers patient dose
d.	Provides a more even density along the length of a part

 

 

ANS:  C                    REF:   Page 61

 

39. A steeper target angle provides:

a.	more heat capacity.
b.	lower patient dose.
c.	less anode heel effect.
d.	smaller effective focal spot.

 

 

ANS:  D                    REF:   Page 57

 

40. Filtration ______ the average wavelength of the x-ray beam.

a.	increases
b.	decreases
c.	does not affect
d.	has no relation to

 

 

ANS:  B                    REF:   Page 60

 

41. The precise area on the target where the x-rays strike is called the:

a.	focal track.
b.	focal spot.
c.	actual focal spot.
d.	effective focal spot.

 

 

ANS:  B                    REF:   Page 55

 

42. Where is the electromagnetic induction motor used in the x-ray machine?

a.	Rotate the anode
b.	Move the tabletop
c.	Move the grid
d.	Send electrons to the filament

 

 

ANS:  A                    REF:   Page 56

 

43. The difference in x-ray intensity (or volume of x-rays) between the anode and the cathode side of the x-ray beam is:

a.	45%.
b.	60%.
c.	75%.
d.	80%.

 

 

ANS:  A                    REF:   Page 59

 

44. The density in the radiographic image is primarily controlled by the:

a.	mA.
b.	mAs.
c.	kVp.
d.	SID.

 

 

ANS:  B                    REF:   Page 60

 

45. The contrast in the radiographic image is controlled by the:

a.	ma.
b.	mAs.
c.	kVp.
d.	exposure time.

 

 

ANS:  C                    REF:   Page 60

 

46. Which of the following would be considered inherent filtration?
47. Oil
48. Mirror
49. Pyrex glass

a.	1 and 2
b.	1 and 3
c.	2 and 3
d.	1, 2, and 3

 

 

ANS:  D                    REF:   Page 61

 

47. Which of the following would be considered added filtration in the x-ray tube?

a.	Oil
b.	Pyrex glass
c.	Aluminum
d.	Tungsten

 

 

ANS:  C                    REF:   Page 61