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Concepts of Image > Chapter 6 > Flashcards

Chapter 6 Flashcards

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

A

Main circuit

22
Q

Which circuit has Exposure switch

A

Main circuit

23
Q

Which circuit has Timer circuit

A

Main circuit

24
Q

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

A

Exposure switch

25
Q

Activates the rotating anode of the x-ray tube.

A

Exposure switch

26
Q

Must be attached to console so operator cannot be exposed

A

Exposure switch

27
Q

1 or 2-step switch

A

Exposure switch

28
Q

ALL switches are “dead man” type meaning

A

x-ray exposure only occurs while the switch is depressed (must have pressure)

29
Q

Regulates exposure termination

A

Timer circuit

30
Q

Most sophisticated timer circuit

A

Electronic timer

31
Q

Timer circuits Capable of very short exposure times. How short?

A

0.001 second

32
Q

• Terminates exposure based upon a predetermined mAs value

A

Milliampere-second (mAs) timers

33
Q

Types of timer circuits

A

AEC TIMER
mAs Timer
Electronic timer

34
Q

What timer circuit has Special ionization chambers

A

AEC

35
Q

AEC Preset to terminate exposure when

A

enough x-ray energy is received

36
Q

AEC has how many chambers

A

Three chamber position

37
Q

AEC stands for

A

Also called Automatic Exposure Device.

38
Q

“Phototiming” is an antiquated term for

A

AEC

39
Q

AEC are located

A

Located in front of image receptor (IR)

40
Q

AEC has how thick of parallel plate

A

5-mm parallel-plate chamber

41
Q

With the AEC what is critical

A

Positioning
Collimation
Proper chambers activated

42
Q

Multiple AEC chambers activation results in “”.

A

averaging

43
Q

AEC is m made to be used for

A

large part radiography.

44
Q

With AEC Collimation must not “cut off” part of an.

A

activated ionization chamber

45
Q

Exposure Charts are still necessary to specify

A

technical parameters to be used.

46
Q

Response Reaction Time is the

A

Minimum amount of time required to terminate exposure in AEC

47
Q

Modern minimum reaction time:

A

• 0.001 seconds

48
Q

BACKUP TIME CIRCUIT
• Used to

A

protect patient and equipment

49
Q

Equipment often allows technologist to set backup
• Should be set at

A

150 percent of anticipated manual technique

50
Q

Maximum exposure per U.S. Public Law:

A

• 600 mAs
• Exposures >50 kVp

Concepts of Image (4 decks)

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