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RT 204 > 6. Patient as a Beam Emitter > Flashcards

6. Patient as a Beam Emitter Flashcards

1
Q 
Is the reduction in the total 
number of x-ray photons 
remaining in the beam after 
passing through a given 
thickness of material
A

Attenuation

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2
Q

As an x-ray beam passes through a patient, the beam is

A

attenuated

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3
Q

The thicker the body part being radiographed, the _____ the attenuation

A

greater

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4
Q

is also affected by the type of absorber

A

Attenuation

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5
Q

Higher atomic number materials (lead or barium)
attenuate a ______ percentage of the beam than low atomic number materials (oxygen, hydrogen and
carbon)

A

greater

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6
Q

Higher atomic number materials

A

lead or barium

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7
Q

low atomic number materials

A

oxygen, hydrogen and

carbon

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8
Q

Effective Atomic number of Fat

A

6.3

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9
Q

Effective Atomic number of Soft Tissue

A

7.4

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10
Q

Effective Atomic number of Lung

A

7.4

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11
Q

Effective Atomic number of Bone

A

13.8

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12
Q

Effective Atomic number of Air (Contrast Material)

A

7.6 / 7.78

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13
Q

Effective Atomic number of Iodine (Contrast Material)

A

53

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14
Q

Effective Atomic number of Barium (Contrast Material)

A

56

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15
Q

Effective Atomic number of Concrete

A

17

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16
Q

Effective Atomic number of Molybdenum

A

42

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17
Q

Effective Atomic number of Tungsten

A

74

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18
Q

Effective Atomic number of Lead

A

82

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19
Q

Density of the absorbing material also has an impact on

A

attenuation

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20
Q

is the quantity of matter per unit of volume

measured in kilograms per cubic meter.

A

Density

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21
Q

is the greatest variable the radiographer

faces when performing a radiographic procedure

A

Patient

22
Q

At the atomic level, the body consists primarily of

A

hydrogen, carbon, nitrogen & oxygen

23
Q

Hydrogen atomic no.

A

1

24
Q

Carbon atomic no.

A

6

25
Q

Nitrogen atomic no.

A

7

26
Q

Oxygen atomic no.

A

8

27
Q

found in concentrated amounts in bones &

teeth

A

Calcium

28
Q

Calcium atomic no.

A

20

29
Q

The composition of the human body determines its

A

radiographic appearance

30
Q

Air has an effective atomic number of 7.78 which is

greater than either

A

fat or muscle

31
Q

is naturally present in the lungs, the sinuses and in

small amounts, in the gastrointestinal tract

A

Air

32
Q

is similar to muscle in that they are both among the soft-tissue structures in the body

A

Fat

33
Q

has an effective atomic number which is slightly less than muscle’s.

A

Fat

34
Q

Like fat, muscle is

A

soft tissue

35
Q

is easily seen radiographically

because of the calcium content of bone

A

skeletal anatomy

36
Q

also has the greatest tissue density and as a result,

absorbs radiation at a greater rate than any of the soft tissues or air-filled structures

A

Bone

37
Q

The patient has an impact on all properties affecting

radiographic quality:

A

Density, Contrast, Recorded Detail

and Distortion

38
Q

The relationships between these factors and the patient

(subject) are termed

A

subject density, subject contrast, subject detail & subject distortion

39
Q

refers to the impact the subject (patient) has on the

resultant radiographic density

A

Subject Density

40
Q

Patients body build

A

Habitus

41
Q

Massive patient body build

A

Hypersthenic

42
Q

Average patient body build

A

Sthenic

43
Q

Slender patient body build

A

Hyposthenic

44
Q

Very slender patient body build

A

Asthenic

45
Q

is the difference in densities of a

recorded image

A

Radiographic contrast

46
Q

is the degree of differential absorption
resulting from the differing absorption characteristics of
the tissues in the body

A

Subject contrast

47
Q

When there is little difference in the absorption
characteristic of the given body tissues within a part
being examined (e.g. mammography) subject contrast
will be

A

low

48
Q

One of the primary factors that affects the sharpness or detail of an image is the ______ between the structure of interest and the image receptor

A

distance

49
Q

is dependent on

their position within the body and also on the body’s placement in relationship to the receptor

A

recorded detail of the structures

50
Q

The _____ and _____ has a great impact on the

recorded detail

A

overall size,

placement

51
Q

is the misrepresentation of the size or shape of

the structure of interest

A

Distortion

RT 204 (11 decks)

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