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Radiation protection 8ed Sherer > Ch11-12 > Flashcards

Ch11-12 Flashcards

1
Q

A diagnostic type tube housing protects the patient from

A

Off focus and leakage radiation

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2
Q

The radiographic table should be uniform thickness and radiolucent; most are made of

A

Carbon fiber

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3
Q

The patients skin surface should be ___cm away from the collimator.

A

15cm

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4
Q

PBL dimensions require not to exceed __%

A

2%

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5
Q

Total filtration is what 2 factors together?

A

Added and inherent

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6
Q

X-ray equipment operating over 70kvp should have a filtration of aluminum thickness to

A

2.5mm aluminum

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7
Q

Compensating filters are used such as:

A

The trough =chest

He wedge=femur , foot

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8
Q

Exposure linearity and Kvp setting should be within the___%

A

10% range of selected kvp

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9
Q

The use of a grid increases patient dose but improves

A

Contrast and visible detail

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10
Q

For mobile radiography, the SSD should be no less than

A

12 inches

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11
Q

Sheets of aluminum

A

Added filtration

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12
Q

The brightness

A

Luminance

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13
Q

The distance from anode focal spot to IR

A

SID

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14
Q

The glass envelope encasing the tube, the insulating oil, and the glass window of the tube housing

A

Inherent filtration

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15
Q

A term used for candelas per square meter

A

Nit

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16
Q

The photoconductor used to convert X-rays to electrical signals

A

Amorphous selenium

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17
Q

When is the use of a grid required??

A

Anything over 70kvp

10cm thickness

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18
Q

To reduce patient dose in flouro, the distance to the image intensifier should be

A

As short as possible

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19
Q

The sharper the image, the ______ the pixels

A

Smaller

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20
Q

Height/distance =

For lead lines on a grid

A

Grid ratio

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21
Q

Is generally located outside the glass window of X-ray tube housing above collimator shutters

A

Added filtration

22
Q

Placing the 1st pair of shutters in the collimator as close to the X-ray tube window will

A

Reduce patient dose from off focus radiation

23
Q

Th genetically significant dose (GSD) for US is

A

.20mSv

24
Q

Air gap can be used in alternative to a

A

Grid

25
Q

Correctly placed gonadal shilding will protect women by _____ and men by _____

A

50%

90-95%

26
Q

To accomadate involuntary motion; a shorter exposure time and increased____ May be used

A

mA

27
Q

A _______ _________ program should ensure that standardization in postprocessing of digital images is done.

A

Quality control

28
Q

The goal of image gently is to make awareness of

A

Lower radiation doses for pediatric patients

29
Q

A blotchy image causes by insuffient quantity of X-ray photons is called

A

Quantum noise/mottle

30
Q

The use of air gap can compensate there what type of grid ?

A

8:1 grid

31
Q

The dosimeter That measures the skin directly

A

TLD

Which uses LiF crystals

32
Q

_____ _____ shields are not recommended for PA projections bcuz of anterior and lateral surfaces are not covered

A

Shaped contact

33
Q

Bone marrow dose may also be referred to as

A

Mean marrow dose

34
Q

For safety of female organs, the shield should be approximately _____ medial to palpable ASIS

A

1inch

35
Q

4 types of shields

A

Flat, shaped, shadow, clear

36
Q

3 ways to specify radiation received by a patient

A

ESE, bone marrow, gonadal dose

37
Q

What can facilities and radiographers do with image gently ??

A

They can “Pledge” to follow them in their dept.

38
Q

What type of shield is used for the lens of the eye??

A

A contact shield

39
Q

What percent of lead of weight should a clear shield have??

A

30%

40
Q

The female reproductive organs receive _____ times more then men during radiographic procedures

A

3x

41
Q

Filtration increases the ________ of the X-ray bean.

A

Quality !!

As it removes low energy X-rays

42
Q

Aluminum has the atomic # of

A

Z=13

43
Q

The numeric values of a digital image are aligned in rows an d columns called

A

An array

44
Q

A scintillator =

A photoconductor=

A

Amorphous silicon

Amorphous selenium

45
Q

Common image matrix are

A

1024x1024

46
Q

CR uses ________ in its image receptor using Eu as th activator.

A

Photostimulable phosphor

47
Q

The most effective protective shield are the

A

Flat contact shields

1mm lead thickness

48
Q

The mean marrow dose is 25% of what the ____________ dose is bcuz the radiation is spread all over the body it is not accurately calculated.

A

Bone marrow dose

49
Q

To follow ASRT and ARRT code of ethics, the —

A

FGP(flourospocally guided positioning)

*Used to locate CR

50
Q

Damage is unlikely to occur to newborn babies if the exposure is under

A

0.2Gy

Radiation protection 8ed Sherer (5 decks)

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