Test 3 Ch 7,8,9 Flashcards Preview

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Flashcards in Test 3 Ch 7,8,9 Deck (44)
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1

3 types of IR systems

Film
CR
DR

2

4 requirements to produce an X-ray:

Vacuum (tube housing)
Source of electrons (filament)
Accelerate electrons (voltage)
Stop electrons (target)

3

The beam of photons before it interacts with the patients body is called

Primary radiation

4

Invisible image created after exposure before processing

Latent image

5

Relationship of radiation intensity and distance from source of radiation

Inverse square law

6

The resulting beam that is able to exit from the patient is called

Remnant Radiation

7

The difference in ____________ allows for the formation of radiographs. As radiation is absorbed differently in different tissues of the body

Attenuation

8

Which bone structure would be radiopaque ?
Radiolucent?

Bones
Air, superficial tissues

9

Exposure factors that determine the quality of the image

mAs
KVP
SID
OID

10

DR has a scintillator typically made of what .... that will convert electrons one n stored in the TFT

Amorphous selenium (a-Se)

11

The ________ determines the individual size of each pixel.

Resolution

12

Indirect capture consists of a two step process:

X-ray photons converted to light using the scintillator and then -converted to electric signal

13

4 factors affecting image quality

Contrast
Density
Resolution
Distortion

14

The X-ray beam is described as

Polyenergetic or heterogeneous

15

The anode and cathode are what charges?

Cathode = negative
Anode= positive

16

Form of X-ray beam collocation of field size that ensures the X-ray exposure field is no larger than receptor size

PBL
Positive beam limitation

17

The process of “coning down” indicates what?

Increased collimation

18

In the cathode, As temperature increases and electrons start “boiling off” through a process called???

Thermionic emission

19

The X-ray tube is made of

Pyrex glass
To withstand extreme amount of heat

20

X-ray tabletops are:

Radiolucent

21

The power of the X-ray system(the generator) is expressed in

Kilowatts

22

Although it is recommended to prep the X-ray tube, repeated prepping of the tube can..

Damage the tube and shorten its lifespan!

23

The most sophisticated and desired tube system?

OTC systems

24

What does it mean when the imaging plate needs conditioning ?

Needs an intense white light source to clear the image

25

Multiple views; 60 images sweep the patient in one breath hold

Tomosynthesis

26

Two basic sources of ionizing radiation:

Natural and man made

27

Natural ionizing radiation are


Man made radiation consists of

Uranium sun, and radium, (radon)
Stemming from sewers

Smoke detectors
Radionuclides

28

X-rays interact with matter in 5 ways!

Classic coherent
Photoelectric
Compton scattering
Pair production
Photodisintegration

29

The two interactions of X-rays with matter that directly influence patients and workers

Compton scattering -effecting workers
Photoelectric -effecting patients

30

coherent scattering is also known as

Thompson, classical