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