Tissue Interactions

Question 1

T/F: As the energy of an x-ray beam is increased, the penetrability is increased

Answer 1

True

Question 2

T/F: In the diagnostic range, characteristic radiation constitutes most of the x-ray beam

Answer 2

False

Question 3

T/F: Penetrability is an expression of x-ray quality and conveys the ability of x-rays to pass through tissues

Answer 3

True

Question 4

T/F: Transmission is the term used to describe what happens when the x-ray photon travels through the part completely

Answer 4

True

Question 5

T/F: X-ray quality decreases as kVp increases

Answer 5

False

Question 6

___ is the reduction of intensity of the x-ray beam as it passes through tissue being imaged

Answer 6

attenuation

Question 7

With the Compton effect, a ___ shell electron is ejected

Answer 7

outer

Question 8

Which x-ray interactions with tissue occur in the diagnostic imaging x-ray energy range

Answer 8

Compton & Photoelectric

Question 9

Which x-ray interactions with tissue involve the removal of an orbital electron?
(1) Compton
(2) Characteristic
(3) Photoelectric

Answer 9

1 and 3

Question 10

T/F: When x-ray photons are created and exit the tube in the primary beam, all the x-ray photons have different energy levels (or the primary beam is considered to be poly-energetic)

Answer 10

True

Question 11

When the kVp selected is equal to or slightly greater than the inner shell binding energy of a tissue atom, which interaction predominates?

Answer 11

Photoelectric

Question 12

What is the ejected electron called in a photoelectric event?

Answer 12

Photoelectron

Question 13

What is the effect of increasing kVp on the x-ray beam?

Answer 13

Increased quality and penetrability

Question 14

The x-ray beam that leaves the patient in the direction of the image receptor is often referred to as:

Answer 14

exit radiation

Question 15

The photoelectric interaction most commonly occurs when the incident photon strikes a/an:

Answer 15

inner shell electron

Question 16

The penetrating power of the x-ray beam is controlled by varying the:

Answer 16

kVp

Question 17

The overall ability of the beam to penetrate an anatomical part is called:

Answer 17

quality

Question 18

The opposite of radiolucent is:

Answer 18

opacity/radiopaque

Question 19

The amount of energy absorbed by an irradiated object is primarily controlled by:
1. Energy of incident photon
2. Atomic number of the tissue
3. Speed of the incident photon

Answer 19

1 and 2

Question 20

Primary radiation is defined as:

Answer 20

radiation that exits from the tube port

Question 21

During a photoelectric interaction, the incident photon is ____________ by the electron of the target atom.

Answer 21

totally absorbed

Question 22

Attenuation is the product of:

Answer 22

absorption and scattering

Question 23

As the energy of an x-ray beam is increased, the penetrability is ______________.

Answer 23

increased

Question 24

___ refers to x-rays leaving the patient that did not interact with atoms as it passed through the patient.

Answer 24

Transmission