X-Ray Physics (Part II) (Irene Gold) Flashcards Preview

Boards Part II and III (Irene Gold) > X-Ray Physics (Part II) (Irene Gold) > Flashcards

Flashcards in X-Ray Physics (Part II) (Irene Gold) Deck (135)
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1

What three things are found inside the Cathode?

Large Filament
Small Filament
Focusing Cap

2

What is the source of the electrons that produce the x-ray?

Filament

3

What is the filament made out of?

Tungsten

4

When does a Thermionic Emission happen?

When current is applied to a filament

5

What controls the quantity of electrons (mA)?

Temperature of the filament

6

What part of the cathode encases the two filaments?

Focusing/Filament Cup

7

In what part of the Cathode does the Thermionic Emission occur?

Filament Cup

8

What is the name of the positive electrode in the x-ray tube?

Anode

9

In most x-ray machines is the anode stationary or rotating?

Rotating

10

What is the reason for a rotating Anode target?

To dissipate the heat that is generated

11

What is the focal area/spot of the Anode?

The exposed area of the tungsten target

12

How is the focal spot determined?

By the size of the filament

13

What does a Smaller filament produce as an outcome?

Better Detail

14

What is it called when "The effect of making the actual focal spot size appear smaller when viewed for the position on the film"?

Line Focus Principle

15

What give you a smaller effective spot on x-ray?

Smaller target angle

16

What is the term used that "Heats the filament causing a boiling off of electrons"?

Millamperage (mA)

17

How is the term Millamperage per Second defined (mAs)?

More Current=More Electrons produced= More x-ray produced= Greater Radiographic density (Darker)

18

What is the term used for overall blackening on the film?

Density

19

What does the term Radiolucent mean?

Structures produce more blackening on the film

20

What term is used for "Structures that produce less blackening on the film"?

Radio-opaque
(Whiter on X-ray)

21

The relationship between what two components of x-ray mAs and density?

They are directly proportional

22

What is the primary way to control how black a film is?

mAs

23

If the mAs is increased what does that mean in terms of film exposure?

The film exposure time is increased

24

What is the minimum change in mAs to see a change in density on the film?

30%

25

What does it mean to the density if the mAs is either doubled or halved?

The density will be doubled or halved, they are directionally proportional

26

What is the definition of Kilovoltage (kVp)?

The force applied to accelerate the electrons from the cathode to the anode at the time of exposure

27

When will the greatest number of high energy x-ray photons be produced?

When a great force of Kilovoltage (kVp) is produced

28

What is the relationship between wavelength and frequency?

Inversely related

29

If there is a low kVp what kind of energy and penetration are produced?

Low energy
Weak penetration

30

What kind of kVp would produce a high energy and a strong penetration?

High kVp