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LMRT > Core > Flashcards

Core Flashcards

1
Q

The annual occupational whole body dose equivalent limit is?

A

50mSv

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2
Q

Total number of x-ray photons produced at the target is contingent on the…?

A

Tube Current
Target Material
Square of Kilovoltage

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3
Q

Anode Angle will effect..?

A

Severity of the heel effect
Focal-spot size
Heat-load capacity

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4
Q

Early symptoms of anaphlyactic shock

A

Dysphagia
Itchy palms/soles
Throat constriction

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5
Q

When is a grid employed?

A

Large/dense body part
High kvp

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6
Q

Disadvantage of moving grids over stationary?

A

Can increase Pt dose
Prohibit use of short exposure time

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7
Q

What does NOT have an impact on recorded contrast?

A

Focal Spot size

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8
Q

What has an impact on recorded contrast?

A

Photon energy
Grid ratio
OID

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9
Q

Most effective method of sterilization?

A

Moist heat

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10
Q

If the FOV stays the same, what happens as matrix size increases

A

Increase spatial resolution
Increased Image Quality
Decreased pixel size

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11
Q

In digital, as matrix size increases

A

Decrease pixel size

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12
Q

What occurs during Bremsstranlung

A

An electron approches a +charge, changes direction and loses energy

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13
Q

In production of characteristic radiation at the tungsten target, the incident electron…?

A

Ejects an inner-shell tungsten electron

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14
Q

Which blood vessels are best suited for determining pulse rate?

A

Superficial arteries

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15
Q

What device is used to control voltage by varying resistance?

A

Rheostat

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16
Q

What will NOT affect pt. dose

A

Focal spot size

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17
Q

@ what whole body dose will death occur?

A

60Sv/6000mSv

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18
Q

@ what whole body equivalent dose will blood changes bee seen?

A

0.25 Sv/250 mSv

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19
Q

Unit used to measure equivalent dose?

A

Sievert (sv)

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20
Q

Gonad shield should be used when the edge of the radiation field is within how many cm?

A

5cm

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21
Q

Which radiation values will always be an equal dose?

A

Absorbed and equivalent

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22
Q

LD 50/30

A

3gy

23
Q

Approx. lead equivalent of a primary barrier?

A

1/16

24
Q

Short term effect are observed within…?

A

3 months

25
Q

Standard lead equivalency of a lead apron is minimum…?

A

.5 m

26
Q

All electromagnetic energy moves through space at the same..?

A

Velocity

27
Q

Which of the following reduces the amount of scatter radiation fog on a radiograph?

A

decrease KVP
Decrease field size

28
Q

Unit for effective dose for occupational workers?

A

mSv

29
Q

Absorbed dose?

A

gray (Gy-T)

30
Q

The primary controlling factor for QUANTITY of photons in the x-ray beam is?

A

kVp

31
Q

The normal pulse rate for an adult?

A

60-100

32
Q

Which form of digital radiography is there a 2-step process?

A
33
Q

If the mA is doubled, dose to the pt will…?

A

Double

34
Q

What can be found on the high voltage side of the xray circuit?

A

mA selector

35
Q

Quantum mottle is caused by too few photons interacting with the body part, will affect image quality by decreasing ?

A

Spatial Resolution

36
Q

Which transformer reduces the voltage on the secondary side to provide an appropriate current to heat the filliment?

A

Step-Down

37
Q

Characteristic Cascade

A

Incident electron interacts with the k-shell of the atom, knocking it out of orbit, releasing an xray photon

38
Q

Bremsstralung

A

Incident electron is pulled off of it trajectory by the magnetic charge of the nucleus, the lost energy is converted into an xray photon

39
Q

Photoelcetric Absorption

A

incident photon interacts with the k-shell of the atom, knocking it out of orbit, releasing an xray photon

40
Q

Coherent/Classical Scatter

A

Incident photon enters the atom causing it to become excited. A photon is released from the atom with the same energy

41
Q

Compton Scatter

A

Incident photon interacts with an outter shell electron, knocking it out of orbit, releasing a photon

42
Q

Ethics as defined?

A

rules that apply values and moral standards to our actions

43
Q

If the mA doubles, the quantity of exposure will…?

A

Double

44
Q

Which of the secondary interactions is primarily responsible for pt dose?

A

Photoelectric

45
Q

Death

A

6000mSv

46
Q

Temporary Sterility

A

2500mSv

47
Q

Blood changes

A

250mSv

48
Q

Erythema

A

2000mSv

49
Q

Nausea/Diarrhea

A

1500mSv

50
Q

LD 50/30

A

3000mSv

51
Q

Which factor is used to alter contrast?

A

kVp

52
Q

What is the usual legal retention for radiographs?

A

5-7

53
Q
A
54
Q

If the distance between the x-ray tube and the IR is cut in half, the exposure to the IR——by a factor of—–

A

Increases; 4

LMRT (6 decks)

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