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Corectec Imaging Equipment (Part 1) Flashcards | StudBud
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Corectec Imaging Equipment (Part 1)
Corectec Imaging Equipment (Part 1)
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1
In the diagram of the x-ray circuit, the red X lies next to which of the following circuit components?
kVp selector
mA selector
Timer
Step-up transformer
2
The colored lines in the diagram of the x-ray tube represent which of the following?
Tube angle
A dual focus tube
Anode heel effect
Line focus principle
3
How can the production of scatter radiation be reduced?
Use close collimation
None of the above
Increase kVp
Increase beam filtration
4
According to Ohm's law, what would the resistance be if the voltage is 110 V and the current is 5 ampere?
55 ohm
220 ohm
550 ohm
22 ohm
5
According to Ohm's law, what would the current be if the voltage is 12 V and the resistance is 1.5 ohm?
6 ampere
8 ampere
4 ampere
2 ampere
6
What does CCD stand for?
Capture-connection device
Computerized capturing device
Computer charging device
Charge-coupled device
7
What type of transformer has more turns of wire in the secondary side than in the primary side?
Step-down
Deltoid
Delta
Step-up
8
Which of the following statements concerning a 16:1 ratio grid is/are true?
None of the above
Has little positioning latitude
Designated for high kVp techiniques
Effectively absorbs scatter rays
9
What are x-ray tubes called that have 2 filament wires?
Dual focus tubes
Triode tubes
Field emission tubes
Double cathode tubes
10
How will grid cutoff appear on a digital image?
Low contrast and quantum noise
Too bright
Too dark
High contrast and quantum noise
11
How will the north pole and the south pole of two magnets affect each other?
They will change polarization
They will attract
They will not be affected
They will repel
12
Electrons will travel in an x-ray tube from:
Target, window
Anode, cathode
Cathode, anode
Target, anode
13
What does grid cutoff mean?
The scatter x-rays are absorbed
The secondary x-rays are absorbed
The primary x-rays are absorbed
The remnant (exit) x-rays are absorbed
14
Which of the following causes the most repeated images in an all digital imaging department?
Motion
Positioning errors
Poor contrast
Under and over exposed images
15
What system captures the x-ray image, converts it to light, and then releases electrons to be stored as a latent image?
Indirect digital imaging
Computed radiography
Direct digital imaging
Film-screen
16
Where is the ionization chamber located in an AEC device?
Below the bucky tray
Behind the image receptor
Between the patient and the image receptor
Between the tube and teh patient
17
An electrical charge can be neutralized if it is conducted to what?
A battery
Ground
A metal pipe
A magnet
18
What is a device called that stores electrical charge?
Capacitor
Ground
Voltmeter
Ammeter
19
In a modern, rotating anode x-ray tube, which of the following will coat the tungsten disk?
Tungsten molybdenum alloy
Tungsten lead alloy
Tungsten copper alloy
Tungsten rhenium alloy
20
When electrons strike the target of an x-ray tube, most of their energy is converted to what?
X-rays
Gamma rays
Heat
Light
21
Which type of rectification will supply the x-ray tube with the greatest power?
Self
Half-wave
Sine-wave
Full-wave
22
What are advantages of using dynamic flat-panel detectors for digital fluoro compared to image-intensified fluoro?
Post processing of images
None of the above
Rectangular image
Better contrast resolution
23
What are materials called that are not attracted to a magnet?
Non-magnetic
Sumagnetic
Paramagnetic
Diamagnetic
24
Which of the following will create the most electrical resistance?
Large diameter
Small diameter
Short wire
Long wire
25
What is the device called that measures electrical current?
Voltmeter
Ground
Ammeter
Capacitor
26
In a computed radiography (CR) system, an analog-to-digital converter (ADC) converts an electric signal into
Signs
Numbers
Light
Analog
27
According to the line focus principle, how does the effective focal spot compare to the actual focal spot?
Smaller
Brighter
Larger
Sharper
28
What determines the quantity of electrons that will be accelerated across the x-ray tube?
Anode speed
Heating of the filament
Focal spot size
Kilovoltage
29
The target of an x-ray tube is made from what metal?
Molybdenum
Tungsten
Copper
Lead
30
Which of the following is not an advantage of AEC?
Reduces repeat radiographic exposures
More latitude in patient positioning
None of the above
Eliminates the need to select mAs
31
The formula, mA x kVp x time, is used to determine which of the following?
Heat units
Penetrating power
Safe exposures
Exposure in Roentgens
32
When an image is extracted from a flat-panel detector the following occur. Put the events in order.
3, 1, 2
2, 3, 1
1, 2, 3
2, 1, 3
33
What are the two kinds of electrical charges?
Positive and negative
Coulomb and volt
Volt and ampere
Ground and ampere
34
Which of the following statements is true?
Neutral charges repel each other
Unlike charges attract each other
Unlike charges repel each other
Like charges attract each other
35
The flow of electrons is known as what?
Capacitance
Space charge
Current
Voltage
36
Which of the following is not essential to the operation of AEC?
Capacitor
Electron emitting device
Back-up-timer
Image intensifier
37
The number of cycles per second that are associated with an alternating current are known as the current's what?
Wavelength
Frequency
Period
Amplitude
38
What is the area of the x-ray target called that is struck by electrons?
Actual focal spot
Heating track
Rotating focal spot
Effective focal spot
39
Thin film transistors (TFT) are found in which type of digital systems?
All of the above
Indirect digital flat-panels
Direct digital flat-panels
Charge-coupled devices
40
What type of transformer core is most widely used in radiographic equipment?
Shell type
Air type
Open core
Closed core
41
Which of the following would not be found in an x-ray tube?
Filament wire
Rotor button
Focusing cup
Rotor
42
How fast to high speed anodes rotate?
10,000 RPM
3400 RPM
1500 RPM
5000 RPM
43
An electric current that continually changes directions is known as what type of current?
Reversible
Stationary
Direct
Alternating
44
Which of the following is a logic function?
Addition
Multiplication
Subtraction
If.....then
45
The image receptor after exposure but before processing is known as what?
A visible image
An imaginary image
A latent image
A manifest image
46
What are the materials called that are strongly attracted to a magnet?
Ferromagnetic
Steromagnetic
Diamagnetic
Paramagnetic
47
The small craters in the target of a used anode of an x-ray tube are known as what?
Blistering
Melting points
Hot spots
Pitting
48
The approx. exposure technique for an abdomen is 70kVp at 200mAs. With AEC, what is the backup time for 400mA and 70kVp?
0.50 seconds
0.10 seconds
0.05 seconds
1.0 seconds
49
The photostimulable phosphor that is used in a CR's imaging plate is barium fluorohalide compound that is doped with:
Calcium
Europium
Iodine
Aluminum
50
Which digital system uses a two-step process to produce a digital image?
CCD
DR
CMOS
CR
51
What is the unit of electrical current?
Volt
Watt
Ampere
Farad
52
What determines the transformer ratio?
Type of wire
Current in wire
Turns of the wire
Size of the wire
53
What is the purpose of the anode in an x-ray tube?
Decelerates electrons
Emits electrons
Repels electrons
Focuses electrons
54
If a step-down transformer has a turns ratio of 1:10, what will the output voltage be if the input voltage is 220 V?
22 V
22 kV
220 V
220 kV
55
What effect will increasing the kVp have on the production of x-rays?
Their number will increase
Their wavelength will increase
Their speed will increase
Their energy will increase
56
In what unit is filament current measured?
Kilovoltage
Voltage
Milliamperage
Amperage
57
Why are high-frequency generators more efficient at producing x-rays than single-phase generators?
Current travels faster
Shorter times are possible
Voltage never drops to zero
Less heat units are produced
58
Which of the following is an example of a compensating filter?
Aluminum wedge filter
Inherent filter
Collimator
Added filter
59
According to Ohm's law, what would the voltage be if the resistance is 2 ohm and the current is 4 ampere?
4 V
2 V
8 V
10 V
60
What is it called when a current is induced in a secondary coil by simply alternating the current in the primary coil?
Mutual induction
Magnetism
Resistance
Back EMF
61
During an exposure, what electrical charge is place on the anode?
Positive
Negative
Neutral
Covalent
62
Why is an x-ray tube made of Pyrex glass?
To prevent breakage if dropped
A lead tube would be too heavy
For a clearer passage of the x-rays
To better withstand heat
63
What is the major reason for using alternating current?
Rectifiers cannot work without it
Current cannot flow without it
Transformers cannot operate without it
X-ray tubes require it
64
Which of the following types of current supplies the x-ray tube?
Two way current
Direct current
Alternating current
Saturated current
65
Why is the x-ray tube made from lead impregnated glass and encased in a lead houseing?
Prevent electrical shock
Protection from breakage
Prevent leakage radiation
Allow for thermal conduction
66
Which of the following conditions will cause grid cutoff with a focused grid?
None of the above
Tube angled across grid
Grid angled
CR not centered to grid
67
Accurate centering of the central ray is critical for which type of grid?
Perpendicular
Crossed
Parallel
Focused
68
What is the unit of electrical power?
Farad
Ohm
Joule
Watt
69
The height of the lead strips divided by the distance between the lead strips defines which of the following?
Grid ratio
Grid frequency
Grid tolerance
Grid focusing distance
70
What controls the incoming voltage to the autotransformer?
Rectifier
Timer
Main breaker switch
Fuses
71
Which of the following devices is used in computed radiography (CR)?
Intensifying screen
Heat sensitive detector
Imaging plate
Computerized radiographic panel
72
What effect does adjusting the filament control have on the production of x-rays?
Controls the quantity
Controls the energy
Controls the quality
Controls the penetrating power
73
Which of the following materials would make the best transformer core?
Soft iron
Wood
Plastic
Aluminum
74
A well-organized quality control program will assure which of the following?
Consistent radiographic quality
Minimal exposure to patients
Minimum down-time of equipment
None of the above
75
Which of the following is the most accurate timer?
Electronic timer
Synchronous timer
Impulse timer
Sine-wave timer
76
Flat-panel detectors use TFT's in an array to capture the x-ray image. What does TFT stand for?
Tin fixture translator
Thin-film transistor
Timed frequency triggers
Triple frequency titanium
77
When electrons strike the anode of an x-ray tube, how much of their energy is converted to x-rays?
50%
Less than 1%
10%
More than 99%
78
How are the north poles of two magnets going to affect each other?
They will not be affected
They will change polarization
They will repel
They will attract
79
Which type of transformer core is most efficient?
Shell type
Closed core
Open core
Air core
80
Which of the following parts would make up the cathode end of the x-ray tube?
Filament and rotor
Rotor, rotating disk, and target
Rotor and rotating disk
Filaments and focusing cup
81
A high frequency generator operated at 100 kVp, 100 ms at 800 mA. What is the power rating?
180 kW
80 kW
50 kW
100 kW
82
If used properly, will an x-ray tube last forever?
Yes
No, the anode will disintegrate
No, the filament wire will break
No, the focus will melt away
83
Which of the following is required of a target metal in an x-ray tube?
None of the above
High melting point
High atomic number
Ability to conduct heat
84
Which of the following is used to reduce the effect of scatter radiation?
Intensifying screens
Compensating filters
Compression devices
Radiographic grids
85
Off-distance grid cutoff is characterized by which of the following?
One side of the image is underexposed
Both sides of the image are underexposed
The top of the image is underexposed
The bottom of the image is underexposed
86
Which of the following is not related to the others
Target
Rotor
Tungsten disk
Filament
87
What is used to focus the electron stream toward the target of the anode?
Copper anode
Focusing lenses
Lead collar
Focusing cup
88
What is a material called that will attract small pieces of iron?
Magnet
Compound
Solenoid
Helix
89
Which type of radiographic grid has lead lines running in two directions?
Focused
Linear
Crossed
Parallel
90
How would cutting the distance between tow magnets in half effect the attraction force between them?
It would not change
It would double
It would be halved
It would increase 4 times
91
Which of the following is the negative terminal of the x-ray tube?
Anode
Cathode
Tungsten disk
Target
92
Which of the following determines the strength of a magnetic field?
The magnet's diameter
How tightly the magnet is wrapped
The spin of the magnet
The number of magnetic field lines in an area
93
What is the unit for resistance?
Ampere
Volt
Watt
Ohm
94
Which of the following layers of a CR imaging plate is sandwiched between the phosphor and the conductive layer?
Laminate layer
Reflective layer
Support layer
Protective layer
95
What type of motor drives the rotating anode?
Direct current
Inductive reactance
Synchronous
Induction
96
The filament wires in radiographic tubes are made from what metal?
Tungsten
Lead
Copper
Molybdenum
97
If line voltage changes because of demands by other users, automatic adjustments are made to which of the following?
Rheostat
Prereading voltmeter
Step-up transformer
Line voltage compensator
98
A radiographic grid should be used whenever kVp exceeds which of the following?
30 kVp
50 kVp
40 kVp
60 kVp
99
When changing from non-grid to an 8:1 grid, how much would the mAs have to be increased?
4x
3x
5x
2x
100
A material that freely allows the flow of electrons is known as what?
Semi-conductor
Conductor
Insulator
Capacitor
