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Concepts of Image > Chapter 6 > Flashcards

Chapter 6 Flashcards

(50 cards)

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1
Q

2 types of X-ray units

A

Diagnostic and Therapeutic

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2
Q

Diagnostic ranges

A

• 10-1200 milliamperes (mA)
• 0.001-10 seconds
• 25-150 kilovoltage peak (kVp)

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3
Q

Therapeutic radiation uses

A

Radiation oncology
• Uses electron therapy

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4
Q

Xray table is made from

A

Radiolucent top of carbon graphite fibers

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5
Q

Different tables for X-rays

A

Curved
• Flat
• Fixed
• Tilted
• Adjustable heights
• Footboard and shoulder supports
• Compression bands

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6
Q

Most common xray table

A

Flat surface

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7
Q

Xray table must

A

• Easy to clean
• Free of crevices that could collect contrast media
Difficult to scratch
Bucky tray

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8
Q

Different xray machines

A

Overhead suspension system (hospital standard)
• Floor to ceiling suspension
• Floor suspension system
• C-arm

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9
Q

Facts about a upright unit

A

Supports image receptor in a vertical orientation
• Bucky assembly
• May include AEC
• Vertical travel
• Tilting or non-tilting

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10
Q

6 other DIAGNOSTIC EQUIPMENT

A

Mammography
• Tomography
• Dental/ panoramic
• Computed tomography (CT)
• Radiation therapy simulators
• Urologic

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11
Q

Inefficient x-ray production generator

A

Single phase (half wave & full wave)

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12
Q

Most popular and widely
available generator

A

High frequency

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13
Q

Most efficient type of electrical power generator

A

High frequency

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14
Q

Least efficient generation to most

A

Single wave
Three phase
High frequency

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15
Q

2 circuits for X-ray

A

Main and filament

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16
Q

Circuit that Supplies x-ray tube with
properly modified power to
properly modified power
create an appropriate
to produce x-rays.

A

Main circuit

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17
Q

What circuit Supplies filament with properly modified power to create an appropriate thermionically emitted electron cloud.

A

Filament circuit

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18
Q

What circuit Low voltage side of circuit

A

Filament

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19
Q

What circuit Provides current and voltage to filament

A

Filament

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20
Q

What circuit Permits selection of milli-amperage (mA)

A

Filament

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21
Q

What circuit High voltage side of circuit

22
Q

Which circuit has Exposure switch

23
Q

Which circuit has Timer circuit

24
Q

Remote control device that permits current to flow through the circuit.

Study These Flashcards
A

Exposure switch

25
Activates the rotating anode of the x-ray tube.
Exposure switch
26
Must be attached to console so operator cannot be exposed
Exposure switch
27
1 or 2-step switch
Exposure switch
28
ALL switches are "dead man" type meaning
x-ray exposure only occurs while the switch is depressed (must have pressure)
29
Regulates exposure termination
Timer circuit
30
Most sophisticated timer circuit
Electronic timer
31
Timer circuits Capable of very short exposure times. How short?
0.001 second
32
• Terminates exposure based upon a predetermined mAs value
Milliampere-second (mAs) timers
33
Types of timer circuits
AEC TIMER mAs Timer Electronic timer
34
What timer circuit has Special ionization chambers
AEC
35
AEC Preset to terminate exposure when
enough x-ray energy is received
36
AEC has how many chambers
Three chamber position
37
AEC stands for
Also called Automatic Exposure Device.
38
"Phototiming" is an antiquated term for
AEC
39
AEC are located
Located in front of image receptor (IR)
40
AEC has how thick of parallel plate
5-mm parallel-plate chamber
41
With the AEC what is critical
Positioning Collimation Proper chambers activated
42
Multiple AEC chambers activation results in "".
averaging
43
AEC is m made to be used for
large part radiography.
44
With AEC Collimation must not "cut off" part of an.
activated ionization chamber
45
Exposure Charts are still necessary to specify
technical parameters to be used.
46
Response Reaction Time is the
Minimum amount of time required to terminate exposure in AEC
47
Modern minimum reaction time:
• 0.001 seconds
48
BACKUP TIME CIRCUIT • Used to
protect patient and equipment
49
Equipment often allows technologist to set backup • Should be set at
150 percent of anticipated manual technique
50
Maximum exposure per U.S. Public Law:
• 600 mAs • Exposures >50 kVp

Concepts of Image (6 decks)

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