Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

ARRT > Image Production 2 > Flashcards

Image Production 2 Flashcards

1
Q

What is the focusing cup made of

A

Molybdenum or nickle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Focusing cup

A
  • negatively charged

- controls the path of electrons from cathode to anode

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Line focus principle

A
  • The effective focal spot is smaller than the actual focal spot
  • angled design of the anode
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What gets projected down to the pt

A

Effective focal spot

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Smaller Effective focal spot ______ spatial resolution

A

Greater

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Which will have the greatest heat capacity

A

Large focal spot with smallest target angle

Ex) 1.0 with 10 degree

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which target degree angle will provide greatest spatial resolution

A
  • pick out smallest angle #*
    1) 7 degrees (CORRECT)
    2) 11 degrees
    3) 15 degrees
    4) 20 degrees
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Anode target material

A

-tungsten (high melting point, high atomic number, ability to dissipate heat)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Selecting mA determines the number of electrons free around what

A

Filament

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Induction motor (stator windings and rotor)

A
  • operates rotor that spins anode during an exposure
  • engaging rotor switch fires the stator in a circular motion around the outside of the tube resulting in a circular movement of the rotor within the tube
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Xray beams are produced how

A

Isotropically (equal intensity in all directions)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Radiation emitted through the metal protective housing should not exceed what

A

1 mGy/hr at 1 meter

Or 100 mR/hr at 1 meter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Insulating oil

A
  • Located outside glass envelope but inside metal protective housing
  • assists in cooling xray tube
  • contributes to inherent filtration
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Filtration

A

Added + inherent = total

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Back up timer

A
  • Determines max length of exposure time for AEC exposure

- set at 150% of the anticipated manual exposure time

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is the purpose of using back up timer when using a AEC device

A

To protect pt if AEC beam fails to terminate exposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Minimum response time (MRT)

A

time it takes for a system to respond and send the signal to terminate the exposure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Ohm’s law

A

V (voltage or electric potential) = I (current measured in Amps) x R (resistance measured in ohms)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Heat unit for single phase (1/2 and full wave)

A

1.0

20
Q

Heat unit for three phase 6 pulse

A

1.35

21
Q

Heat unit for three phase 12 pulse

A

1.41

22
Q

Heat unit for high frequency

A

1.61

23
Q

Parallel circuit

A

Find lowest value and divide by 2
Ex) 5,10,15,20
5/2= 2.5

24
Q

Transformers operate on the principle of electromagnetic induction and require what to operate

A

Alternating current

25
Q

As The number of turns of a conductor material increases ____ electromotive force is produced

A

Greater

26
Q

Turns ratio

A

Ts/Tp

27
Q

Located on primary low volatility side

A

1) AC supply
2) master wall switch
3) fuses
4) line voltage meter
5) autotransformer
6) line voltage compensator
7) pre reading kVp meter
8) exposure switch
9) exposure timer

28
Q

Source for kV

A

Autotransformer (self induction)

29
Q

When/where does voltage become kilovoltage

A

At step up transformer (operates on principle of electromagnetic mutual induction)

30
Q

Filament transformer

A
  • aka low voltage or step-down transformer
  • located within low voltage filament circuit
  • electromagnetic mutual induction
31
Q

What is an example of a precision (variable) resistor

A

mA station

32
Q

Types of exposure timers

A

1) mechanical
2) synchronous (capable of exposure times in multiples of 60
3) electronic (accurate)
4) mAs
5) impulse
6) AEC

33
Q

Located within filament low voltage circuit

A

1) mA selector

2) focal spot selector

34
Q

Located in secondary or high voltage circuit

A

1) mA meter

2) rectifiers

35
Q

High frequency

A
  • results in higher xray quality and quantity

- voltage ripple is 1% since voltage waveform is nearly constant

36
Q

ADC

A

Performs the sampling and quantization of data

37
Q

Rescaling

A

Processing technique used to correct for over or under exposure

38
Q

Histogram

A

Present a graphical representation of optimal densities during an exposure and recognition of exposure data requires processing only optimal receptor exposure exposures

39
Q

Values of interest

A

The digital data set of information that is arranged into a histogram distribution

40
Q

LUT is used to as a reference to evaluate what

A

The raw information and to correct the luminance values

41
Q

Edge enhancement

A

Results when the signal average includes fewer pixels in the neighborhood. Used when fine details in an image or shown with some blur

42
Q

The ability of a system to provide contrast enhancement

A

Equalization

43
Q

Another name for smoothing

A

Low pass filter

44
Q

Occurs by averaging all pixels frequency with surrounding pixel values to remove image noise

A

Smoothing

45
Q

Describes the contribution of all system components towards total resolution

A

Modulation transfer function

-resolution is best as MTF value approaches 1

46
Q

Magnification factor=

A

Image size/object size

47
Q

Equalization

A

Makes light areas darker and dark areas lighter

ARRT (9 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions