6. Patient as a Beam Emitter

Question 1

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

Answer 1

Attenuation

Question 2

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

Answer 2

attenuated

Question 3

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

Answer 3

greater

Question 4

is also affected by the type of absorber

Answer 4

Attenuation

Question 5

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

Answer 5

greater

Question 6

Higher atomic number materials

Answer 6

lead or barium

Question 7

low atomic number materials

Answer 7

oxygen, hydrogen and

carbon

Question 8

Effective Atomic number of Fat

Answer 8

6.3

Question 9

Effective Atomic number of Soft Tissue

Answer 9

7.4

Question 10

Effective Atomic number of Lung

Answer 10

7.4

Question 11

Effective Atomic number of Bone

Answer 11

13.8

Question 12

Effective Atomic number of Air (Contrast Material)

Answer 12

7.6 / 7.78

Question 13

Effective Atomic number of Iodine (Contrast Material)

Answer 13

53

Question 14

Effective Atomic number of Barium (Contrast Material)

Answer 14

56

Question 15

Effective Atomic number of Concrete

Answer 15

17

Question 16

Effective Atomic number of Molybdenum

Answer 16

42

Question 17

Effective Atomic number of Tungsten

Answer 17

74

Question 18

Effective Atomic number of Lead

Answer 18

82

Question 19

Density of the absorbing material also has an impact on

Answer 19

attenuation

Question 20

is the quantity of matter per unit of volume

measured in kilograms per cubic meter.

Answer 20

Density

Question 21

is the greatest variable the radiographer

faces when performing a radiographic procedure

Answer 21

Patient

Question 22

At the atomic level, the body consists primarily of

Answer 22

hydrogen, carbon, nitrogen & oxygen

Question 23

Hydrogen atomic no.

Answer 23

1

Question 24

Carbon atomic no.

Answer 24

6

Question 25

Nitrogen atomic no.

Answer 25

7

Question 26

Oxygen atomic no.

Answer 26

8

Question 27

found in concentrated amounts in bones & | teeth

Answer 27

Calcium

Question 28

Calcium atomic no.

Answer 28

20

Question 29

The composition of the human body determines its

Answer 29

radiographic appearance

Question 30

Air has an effective atomic number of 7.78 which is | greater than either

Answer 30

fat or muscle

Question 31

is naturally present in the lungs, the sinuses and in | small amounts, in the gastrointestinal tract

Answer 31

Air

Question 32

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

Answer 32

Fat

Question 33

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

Answer 33

Fat

Question 34

Like fat, muscle is

Answer 34

soft tissue

Question 35

is easily seen radiographically | because of the calcium content of bone

Answer 35

skeletal anatomy

Question 36

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

Answer 36

Bone

Question 37

The patient has an impact on all properties affecting | radiographic quality:

Answer 37

Density, Contrast, Recorded Detail | and Distortion

Question 38

The relationships between these factors and the patient | (subject) are termed

Answer 38

subject density, subject contrast, subject detail & subject distortion

Question 39

refers to the impact the subject (patient) has on the | resultant radiographic density

Answer 39

Subject Density

Question 40

Patients body build

Answer 40

Habitus

Question 41

Massive patient body build

Answer 41

Hypersthenic

Question 42

Average patient body build

Answer 42

Sthenic

Question 43

Slender patient body build

Answer 43

Hyposthenic

Question 44

Very slender patient body build

Answer 44

Asthenic

Question 45

is the difference in densities of a | recorded image

Answer 45

Radiographic contrast

Question 46

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

Answer 46

Subject contrast

Question 47

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

Answer 47

low

Question 48

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

Answer 48

distance

Question 49

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

Answer 49

recorded detail of the structures

Question 50

The _____ and _____ has a great impact on the | recorded detail

Answer 50

overall size, | placement

Question 51

is the misrepresentation of the size or shape of | the structure of interest

Answer 51

Distortion