Ch.3

Question 1

How is an image formed with x-ray photons ?

Answer 1

Formed by photons that pass through the patient and hit the IR

Question 2

Differential absorption is dependent upon

Answer 2

1. Part thickness
2. Atomic #
3. Tissue density
4. Beam quality/energy

Question 3

Processes required to create a radiographic image through differential absorption

Answer 3

1. Beam attenuation
2. Absorption
3. Transmission

Question 4

What forms the latent image ?

Answer 4

Transmitted photons

Question 5

X-ray photon energy is deposited and absorbed by the part

Answer 5

Absorption

Question 6

X-ray photon loses energy during interaction and changes direction

Answer 6

Scatter

Question 7

X-ray beam absorption occurs through which interaction ?

Answer 7

Photoelectric ?

Question 8

1 photon in = 1 photon, 1 characteristic x-ray photon out

Answer 8

Photoelectric

Question 9

Probability of photoelectric is depended on the _______ of the incoming x-ray photon and the atomic number of the tissue

Answer 9

Energy

Question 10

Scatter occurs during which reactions ?

Answer 10

Compton and Coherent

Question 11

1 photon in= 1 photon and electron out

Answer 11

Compton

Question 12

Can occur within all diagnostic energies and it more dependent on the energy of the incoming photon, NOT the atomic number of the tissue which is only an “opportunity” for the x-ray interactions to happen

Answer 12

Compton scatter

Question 13

Provides no useful information if stricks the IR

Answer 13

Compton scatter

Question 14

If this type of scatter does not strike the IR, it can lead to

Answer 14

Technologist and patient exposure

Question 15

1 photon in= 1 photon out

Answer 15

Coherent scatter

Question 16

This form of scatter causes excitement of the atom but no ionization

Answer 16

Coherent

Question 17

Occurs in low energy x-rays (below 10kev)

Answer 17

Coherent scatter

Question 18

Reduction of intensity of the primary x-ray beam through matter

Answer 18

Attenuation

Question 19

Electromagnetic energy is transferred from the x-ray to the atoms of the patients biological tissue

Answer 19

Absorption

Question 20

Photons pass through the patient, hit the IR, and have no interaction with structures of the body

Answer 20

Transmission

Question 21

What is the other name for Exit Radiation

Answer 21

Remnant radiation

Question 22

Remnant radiation consists of

Answer 22

Transmitted photons and absorbed photons

Question 23

Transmitted and absorbed radiation create an image that represents

Answer 23

The area that is imaged

Question 24

Scatter radiation causes unwanted exposure called

Answer 24

Fog

Question 25

Absorbed radiation creates

Answer 25

Increased brightness or white areas on the displayed image

Question 26

Transmitted radiation creates

Answer 26

Low brightness or black areas on the displayed image

Question 27

High transmission =

Answer 27

More darkness/black

Question 28

Low transmission =

Answer 28

More light /white

Question 29

Probability of photoelectric effect is dependent on

Answer 29

Energy of the incoming x-ray photon and tissue atomic number

Question 30

Higher kvp reduces the number of interactions overall, but the number of _____ interactions increases in comparison to the number of photoelectric interactions

Answer 30

Compton

Question 31

X ray are attenuated exponentially and generally reduced by ______ for each ________ of tissue thickness

Answer 31

50%, 4-5cm (1.6-2in.)

Question 32

Tissues composed of a higher effective atomic number will

Answer 32

Increase beam attenuation

Question 33

Increasing the compactness/density of the atomic particles will

Answer 33

Increase beam attenuation

Question 34

Higher kvp increases the energy of the x-ray beam and will

Answer 34

Decrease attenuation

Question 35

Bone atomic #

Answer 35

13.8

Question 36

Fat atomic #

Answer 36

6-7

Question 37

Air atomic number

Answer 37

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