Deck 2: The X-Ray Beam

Question 1

Which of the following could be defined as the production of an x-ray photon by a collision between the incident electron and a K-shell electron of the tungsten atom?

A) Photoelectric interaction
B) Bremsstrahlung interaction
C) Characteristic interaction
D) Pair production interaction

Answer 1

Characteristic interaction

Question 2

Increasing the kVp will do which of the following?

A) Decrease the tube current.
B) Increase the speed of the electrons.
C) Increase the penetrability of the beam.
D) b and c

Answer 2

b and c

Question 3

The filament is made of:

A) tungsten.
B) rhenium.
C) molybdenum.
D) lead.

Answer 3

tungsten.

Question 4

What is the anode target of a mammographic tube made of?

A) Molybdenum
B) Tungsten
C) Rhenium
D) Beryllium

Question 5

Effective compensation for the anode heel effect would involve positioning:

A) the thinnest portion of the part under the anode.
B) the thickest portion of the part under the anode.
C) the thinnest portion of the part under the cathode.
D) b and c

Question 6

What is the base material of the rotating anode?

A) Molybdenum
B) Tungsten
C) Rhenium
D) Beryllium

Question 7

The focusing cup:

A) surrounds the anode.
B) has a positive charge.
C) has a negative charge.
D) focuses the x-ray beam.

Question 8

What is an acceptable level of leakage from the tube housing?

A) 100 mR/hr measured 6 feet away
B) 10 mR/hr measured 1 foot away
C) 1000 R/hr measured at a distance of 4 meters
D) 100 mR/hr measured at a distance of 1 meter

Question 9

_____ is the phenomenon that occurs around the filament during thermionic emission and prevents the further escape of electrons from the filament.

A) Saturation current
B) Space charge effect
C) mA rectification
D) Line focus principle

Question 10

The _____ is the portion of the x-ray tube that contains the filament.

A) cathode
B) anode
C) rotor
D) rotating disk

Question 11

The amount the voltage varies during an x-ray exposure is known as:

A) kVp.
B) voltage ripple.
C) mA.
D) tube current.

Question 12

Which of the following could be defined as the production of an x-ray photon by the electrostatic attraction between the incident electron and the nucleus of the tungsten atom?

A) Photoelectric interaction
B) Bremsstrahlung interaction
C) Characteristic interaction
D) Pair production interaction

Question 13

_____ is the boiling off of electrons from the filament when current is applied.

A) Saturation emission
B) Thermionic emission
C) Filament transport
D) Proton emission

Question 14

The actual flow of electrons from cathode to anode within the x-ray tube is known as:

A) tube current.
B) filament current.
C) anode current.
D) a and c

Question 15

The positive side of the x-ray tube is the:

A) anode.
B) cathode.
C) window.
D) stream of electrons.

Question 16

mA is a measure of _____ that flows from cathode to anode.

A) filament current
B) tube current
C) space charge
D) thermionic emission

Question 17

What is the term used to describe the resistance to letting more electrons escape from a heated filament?

A) Saturation emission
B) Space charge effect
C) Electrostatic attraction
D) Thermionic emission

Question 18

The maximum speed the rotating anode will most likely achieve is _____ rpm.

A) 3200
B) 5000
C) 10,000
D) 20,000

Question 19

What is the name of the exact area on the anode that is struck by the electron beam?

A) Focal spot
B) Focal point
C) Target
D) Any of the above

Question 20

What is the name of the device in a rotating anode x-ray tube that turns the rotor?

A) Stator
B) Rotor
C) Focusing cup
D) Rheostat

Question 21

The filtration of the x-ray beam results in:

A) increased beam quantity.
B) increased beam quality.
C) lower average energy photons.
D) b and c

Question 22

The amount of filtration required to reduce the exposure of the beam to half of its original intensity is defined as:

A) wedge filtration.
B) HVL.
C) mAs compensator.
D) mA linearity.

Question 23

What is the focal spot size measured directly under the anode target?

A) Actual focal spot
B) Target focal spot
C) Filament focal spot
D) Effective focal spot

Question 24

Which of the following types of filtration produces a more uniform density on the radiograph?

A) Compensating
B) Half-value
C) Inherent
D) Spatial

Question 25

Which of the following is not classified as inherent filtration?

A) The oil in the transformer
B) The collimator mirror
C) The glass tube envelope
D) The oil surrounding the tube