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Radiology > General 2.4 > Flashcards

General 2.4 Flashcards

1
Q

All of these affect contrast?

A

kVP

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2
Q

What is the inherent filtration

A

Metal Housing
Insulating Oil
Glass envelope

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3
Q

What allows you to qualitatively change an image? What are 2 examples

A

MIPACs (using algorithms to mathematically change density values to predetermined numerical values)
Magnification and Edge Enhancement

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4
Q

Which one reads the electrical signal?

A

dark purple

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5
Q

Which one converts visible light to electrical signal

A

periwinkle

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6
Q

What increases magnification?

A

Increased object to receptor distance

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7
Q

What wave has the most energy?

A

Picture of a few and it is the one with the highest frequency (it was 4lol)

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8
Q

The energy needed to remove an electron from its shell is…

A

Binding energy

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9
Q

What is the focusing cup made of and what is its charge?

A

Molybdenum
Negative

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10
Q

Picture of an x-ray tube and asks what dissipates heat

A

Copper stem

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11
Q

Picture of an x-ray tube and asks what creates the electrons

A

Tungsten filament

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12
Q

The transformer that brings 110 volts to 3-5 and is controlled by what?

A

Step-down transformer
mA

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13
Q

What increases sharpness?

A

Increased source to object distance

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14
Q

Why did it take so long to switch from film to digital?

A

IDK, expensive equipment and patient comfort?

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15
Q

Picture of edge enhancement

A
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16
Q

Picture of length calibration or measurement ruler

A
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17
Q

If you change the tube from 6 to 12 what happens to the beam intensity

A

1/4

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18
Q

PSP what is important

A

Laser and scintillator

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19
Q

In the production of a digital image in CMOS, what does the x-radiation get converted to?
Electricity
Numerical value
Visible light
Gray value

A

visible light –> what the scintilator does

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20
Q

How fast does the x-ray travel in vacuum? (FITB)

A

speed of light

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21
Q

What is true about copper and tungsten?

A

K shell of tungsten is more energy than L shell

22
Q

Characteristic radiation is…

A

Electron to electron (knocked from one shell to another)

23
Q

If you move the tube mesially but the object moves distally where is it?

A

Buccal
SLOB

24
Q

Which one has the lowest radiation

A

CCD

25
Q

What is CCD?

A

Direct

26
Q

Why is low vapor pressure important?

A

maintain vacuum

27
Q

Bitewing where contacts are overlapped. What is wrong?

A

Horizontal angulation

28
Q

Picture of X-ray head and says what must be maintained in space 5?

A

Vacuum

29
Q

What is the point of line principle system?

A

Used to dissipate heat and increase resolution

30
Q

What does the rectifier do to electrons?

A

always go cathode to anode

31
Q

What does a rectifier do?

A

Turn all to direct and go cathode to anode

32
Q

If it hits the nucleus directly what energy is release and what type of x-ray

A

Maximum, bremsstrahlung

33
Q

Matter is..

A

Something with mass and takes up space

34
Q

Which of the following is true?
Most is characteristic (not true)

A

idk

35
Q

Edge enhancement does what?

A

Simulate or hide disease states

36
Q

If you increase ___ , then the ____ of electrons will increase?

A

mA, amount

37
Q

Which element is associated with film?

A

silver

38
Q

What is not ionizing radiation?

A

Microwaves

39
Q

What has the best spacial resolution?

A

Film

40
Q

Definition of thermionic emission

A

Low voltage filament current heats the tungsten with the result being the separation of electrons from the outer shell of the tungsten atom
-separation of electrons

41
Q

When object and receptor are not parallel and beam and receptor are perpendicular?

A

Teeth appear shorter

42
Q

Small focal spot:

A

Higher spatial resolution

43
Q

Decrease sharpening:

A

Larger focal spot

44
Q

Definition of quality

A

Mean energy of the X-rays

45
Q

High contrast needs low kVp

A

true

46
Q

Edge enhancement multiple

A
47
Q

What is a part of the cathode:

A

Tungsten filament

48
Q

If you want to keep density the same, and double mA, what would you do to time

A

half it

49
Q

Characteristic:

A

Electron from inner gets knocked out and electron from outer fills in

50
Q

What would happen if you couldn’t compress x-ray files-

A

server wouldn’t have ideal storage space

51
Q

Which of the following requires the use of chemical interactions to produce a radiographic image?
a. CMOS
b. PSP
c. Film
d. CCD

A

film

Radiology (36 decks)

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