11075473
Beschreibung
Quiz von Alexandra Ertmer, aktualisiert more than 1 year ago
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Erstellt von Alexandra Ertmer
vor mehr als 6 Jahre
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Frage 1
Frage
The x-ray intensity is lower on the anode side of the tube because of the:
Antworten
-
Line Focus Principle
-
Heel Effect
-
Focusing Cup
-
Filament Length
Frage 2
Frage
Which of the following is (are) true regarding the protective housing of the x-ray tube?
Antworten
-
Provides mechanical support for the x-ray tube.
-
Protects the tube from damage.
-
Aids in absorbing low energy radiation created within the x-ray tube.
-
All of the above
Frage 3
Frage
The negative side of the x-ray tube holds the:
Antworten
-
Filament
-
Anode
-
Target
-
Rotor
Frage 4
Frage
Tube arcing is caused by:
Antworten
-
A small focal spot
-
The angle of the anode
-
Tungsten collecting on the envelope of the tube
-
Not warming up the tube
Frage 5
Frage
A dual focus tube has two:
Antworten
-
Anodes
-
Filaments
-
Rotors
-
Stators
Frage 6
Frage
An x-ray tube has a tube rating chart to show:
Antworten
-
Housing cooling times
-
Anode cooling times
-
Maximum exposure times
-
Maximum patient doses
Frage 7
Frage
This device is located outside the glass envelope:
Antworten
-
Stator
-
Rotor
-
Focal Spot
-
Filament
Frage 8
Frage
Which of the following is needed to produce an x-ray?
Antworten
-
A source of electrons
-
A vacuum
-
A large potential difference
-
All the above
Frage 9
Frage
The tube current is changed by changing the:
Antworten
-
Filament Current
-
Anode Voltage
-
Focal Spot Size
-
Exposure Time
Frage 10
Frage
A function of the cathode is to:
Antworten
-
Be a focal spot
-
Produce an electrical connection to the rectifier
-
Produce a thermionic cloud
-
Rotate the anode
Frage 11
Frage
The function of the rotor & the stator assembly is to:
Antworten
-
Create a vacuum
-
Insulate the anode
-
Rotate the anode
-
Produce a thermionic cloud
Frage 12
Frage
Each of the following is a part of the cathode assembly except the:
Antworten
-
Stator
-
Filament
-
Focusing Cup
-
Associated Wiring
Frage 13
Frage
Each of the following is a material of choice for the filament except:
Antworten
-
Copper
-
Tungsten
-
Rhenium
-
Molybdenum
Frage 14
Frage
Filament materials are chosen for their:
1)High Melting Point
2)Low Melting Point
3)Ability to Vaporize Easily
4)High Atomic Number
Antworten
-
Numbers 1 & 3 only
-
Numbers 2 & 3 only
-
Numbers 1 & 4 only
-
Numbers 2 & 4 only
-
Numbers 1, 3, & 4 only
Frage 15
Frage
The focusing cup has a _______ charge.
Antworten
-
Negative
-
Positive
Frage 16
Frage
The purpose of the focusing cup is to:
Antworten
-
Alter the filament size
-
Group the electrons for their passage to the anode
-
Regulate anode rotation speed
-
Increase the heat capacity
Frage 17
Frage
X-ray production occurs at the:
Antworten
-
Anode
-
Cathode
-
Filament
-
Stator
Frage 18
Frage
To extend the x-ray tube life, the technologist should:
1)Perform warm up exposures at the beginning of each day
2)Extend the time that the boost current (prep) button is held down
3)Avoid repeated exposures at or near the tube's capacity
Antworten
-
1 & 2 Only
-
1 & 3 Only
-
2 & 3 Only
-
1, 2, & 3
Frage 19
Frage
When the anode angle is less than 45 degrees:
Antworten
-
Effective focal spot is smaller than the actual focal spot
-
The actual focal spot of smaller than the effective focal spot
-
The angle has no effect on focal spot
Frage 20
Frage
The exact point in the x-ray unit where x-ray photons are created in:
Antworten
-
Focusing Cup
-
Rotor
-
Filament
-
Focal Spot
Frage 21
Frage
To cover a 14x17 inch field at 40 inch SID, a ________ target angle is required.
Antworten
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3 Degrees
-
5 Degrees
-
7 Degrees
-
12 Degrees
Frage 22
Frage
The use of line focus principle causes a problem known as the ________.
Antworten
-
Anode Heel Effect
-
Space Charge Effect
-
Quantum Mottle
-
Vacuum
Frage 23
Frage
The disadvantage of a small target angle is:
Antworten
-
Increased heat distribution & capacity
-
Greater field coverage
-
A greater anode heel effect
-
A more uniform radiographic density
Frage 24
Frage
Warming the x-ray tube:
1)Is never necessary
2)Prevents cracking of the anode
3)Helps maintain the vacuum within the tube
Antworten
-
1 & 2 Only
-
2 & 3 Only
Frage 25
Frage
Pitting of the anode commonly occurs:
Antworten
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Consistent low but very long exposures
-
Consistent single, high exposures
-
Failure to warm up the tube
-
All the Above
Frage 26
Frage
Anode melt might occur in a specific area on the anode due to:
Antworten
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The unit not being warmed up properly
-
Extended use
-
When the kVp is too high
-
When the stator fails & the rotor ceases to turn
Frage 27
Frage
The anode heel effect:
Antworten
-
Exists because some x-rays are absorbed by the surface of the anode
-
Is caused by the charge difference between the anode & cathode
-
Depends on the mA & kVp
-
Is reduced by dual focal spot
Frage 28
Frage
The line focus principle:
Antworten
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Makes use of an angled cathode structure
-
Produces x-ray lines
-
Spreads the heat over a larger part if the anode
Frage 29
Frage
To best apply the anode heel effect, the anode should be placed towards which end of the body when performing an AP projection?
Antworten
-
Towards the Knee
-
Towards the Hip
Frage 30
Frage
The vacuum created within the x-ray tube increase the efficiency of the tube's operation.
Antworten
- True
- False
Frage 31
Frage
The cathode is the positive side of the x-ray tube.
Antworten
- True
- False
Frage 32
Frage
The faster the anode rotation, the better the heat dissipation.
Antworten
- True
- False
Frage 33
Frage
Many x-ray tubes have two filaments:
Antworten
-
Because the second filament can be used as a spare part when the first is burned out
-
Provide two focal spots
-
To allow cooling of the filament by alternating exposures
-
To improve tube cooling by sharing the hear between two filaments
Frage 34
Frage
Modern general purpose radiographic equipment uses a stationary anode.
Antworten
- True
- False
Frage 35
Frage
The most common diagnostic radiography target angle is 12 degrees.
Antworten
- True
- False
Frage 36
Frage
The anode disk is composed of several different materials.
Antworten
- True
- False
Frage 37
Frage
Changing the angle of the anode will change the effective focal spot.
Antworten
- True
- False
Frage 38
Frage
One way to extend tube life is by using high mA stations when possible.
Antworten
- True
- False
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