Ch3

Question 1

• Incoming x-ray
  photon interacts with
  a loosely bound outer
  (or middle) electron of
  an atom

• The incoming x-ray
photon surrenders a
portion of its energy,
ionizing the atom.

Answer 1

Comptom scatter

Question 2

Incoming x-ray photon interacts with the electric field surrounding the
nucleus of an atom of irradiation tissue and disappears.
• The energy of the photon is absorbed and transformed into a
negatron and a positron

Answer 2

Pair Production

Question 3

An interaction that
occurs at more than 10 MeV in
high-energy radiation therapy
treatment machines

Answer 3

Photodisintegration

Question 4

Occurs at an energy level of at least 1.022 million electron volts (MeV).
• Beyond diagnostic energy range.

Answer 4

Pair Production

Question 5

Incoming x-ray photons the interacts a loosely bound outer electron of an atom

• Incoming x-ray photon surrenders a portion of his energy ionizing the atom

Answer 5

Compton scatter

Question 6

Structures are similar in Atomicnumber z number ) and mass Must be distinguished by the use of

Answer 6

Contrast media

Question 7

Barium iodine Bright/white

Answer 7

Positive contrast medium

Question 8

Air dark/black

Answer 8

Negative contrast medium

Question 9

The greater the difference in the amount of Photoelectric absorption the greater the

Answer 9

Contrast

Question 10

As the absorption increases so does the potential…

Answer 10

Biologic damages

Question 11

Less attenuation equals

Answer 11

Darker image

Question 12

Image must have a significant amount of_____ In density to be clearly visualize

Answer 12

Variations

Question 13

Atomic number for compact bone

Answer 13

13.8

Question 14

Atomic number for soft tissue

Answer 14

7.4

Question 15

Less density tissue less attenuation

Dense tissue more attenuation

These factors are known as

Answer 15

Influence attenuation

Question 16

Occurrence of photoelectric absorption depends on

Answer 16

Energy E

Atomic number Z 

Question 17

Absorption increase ….. what happens to E and Z

Answer 17

Energy Incident photons decreases

Z of irritated out of increases

Question 18

Discovered by Pierre Victor Auger in 1925
> Produces an Auger electron
> Is a radiationless effect

Answer 18

Augar effect

Question 19

By-products of Photoelectric Absorption

Answer 19

Photoelectron and characteristic x-ray photons

Question 20

Interaction between x-ray photons and inner shell electrons

Answer 20

Photo electric absorption

Question 21

Diagnostic energy ranges  23 to 150 kvp

most important mode of interaction
between x-ray photons and the atoms

Answer 21

Photoelectron Absorption

Question 22

(aka fluorescent radiation)
(the remainder of the released energy which is so low it will be absorbed by the body)

Answer 22

Characteristic photon

Question 23

Interaction of photons in biologic matter is

Answer 23

Random

Question 24

Photons that undergo either absorption or scatter does not strike the image reception

Answer 24

Attenuation

Question 25

Photons that strike the image receptor are transmitted

Answer 25

Transmission

Question 26

Some primary photons will transverse the patient without interacting and reaching the image receptor

Answer 26

Direct transmission

Question 27

Other primary photons can’t undergo Compton or coherent interactions as a result may be scattered or deflected with a potential loss of energy

Answer 27

Indirect transmission

Question 28

x-ray photons that interact with the atoms of a patient such that they give up all of their energy and cease to exist

Answer 28

Absorption

Question 29

x-ray photons that interact with the atoms of the patient, but only surrender part of their energy.

Answer 29

Scatter

Question 30

A diagnostic x-ray beam is produced when a stream of very energetic electrons bombards a positively charged target in a highly evacuated glass tube.

Answer 30

Primary radiation

Question 31

Target (anode) composition used

Answer 31

Tungsten (a metal) > Tungsten rhenium (a metal alloy)

Question 32

• The amount of energy per unit mass is).

Answer 32

absorbed dose

Question 33

energy level of photons in the x-ray beam, equal to the highest voltage established across the x-ray tube.

Answer 33

Kvp

Question 34

electron tube current and the amount of time in seconds that the x-ray tube is activated.

Answer 34

Mas