Test One

Question 0

What is a diode tube?

Answer 0

Two electrodes

Question 1

What is electronic vaccine tube?

Answer 1

Keeps electrons at high speed

Question 2

Electrons flow_____ to _____?

Answer 2

Cathnode to anode. Filament to target

Question 3

D: External structure of tube

Answer 3

Supporting and protective structure. Glass or metal envelope

Question 4

External components to tube

Answer 4

Everything outside

Question 5

Leaking radiation

Answer 5

X-rays are isotopic. They can go every which way

Question 6

____% heat, ____% X-rays?

Answer 6

98, 2

Question 7

Leaking radiation must be reduced to less than______?

Answer 7

100mR/hr at 1m

Question 8

What are the four parts of the tube?

Answer 8

Metal housing, Glass housing, and anode and cathode.

Question 9

What is the metal housing made up of?

Answer 9

Lead

Question 10

What is the glass envelope insulated with

Answer 10

Oil

Question 11

Why is the metal housing better than glass housing

Answer 11

Tungsten deposits decreases

Question 12

What are the two internal structures of the tube

Answer 12

Cathode and anode

Question 13

What two parts consists in the cathode

Answer 13

Filament and focusing cup

Question 14

Filament

Answer 14

Burning off of electrons causing x-rays

Question 15

Focusing cup

Answer 15

This is the stream of electrons creating the primary been

Question 16

What is the filament made up of

Answer 16

Tungsten wire

Question 17

Thermionic Emmison

Answer 17

Boiling off of electrons at the filament

Question 18

What are the smaller filaments used for

Answer 18

Fingers wrist hand and toes

Question 19

What are the bigger filaments used for

Answer 19

Chest abdomen and spine

Question 20

Space charge

Answer 20

Form a cloud around the filament

Question 21

Space charge effect

Answer 21

Not allowing more electrons to burn off the filament

Question 22

What is the focusing cup made up of

Answer 22

Nickel and Molybedenum

Question 23

What does the focusing cup do

Answer 23

Allows electrons to flow freely across the two from cathode to anode

Question 24

Efficiency of focusing cup depends on? (5)

Answer 24

Size, shape, charge, filament size and shape and position of the filament

Question 25

The cathode is_____and the anode is____?

Answer 25

Negative, positive

Question 26

Is the stationary anode or a rotating anode better

Answer 26

Rotating anode is better

Question 27

The anode consists of (3)

Answer 27

Target stator rotor

Question 28

What does the target do

Answer 28

Stops electrons in the two current to produce x-rays

Question 29

What is the target made up of

Answer 29

Tungsten 90% and rhenium alloy 10%

Question 30

What is the target embedded in

Answer 30

Molybedenum and Graphite

Question 31

Embedded in Molybedeum and graphite will help with what

Answer 31

Dissipate the heat

Question 32

Stater

Answer 32

Electric motor that turns rotor at a very high speed

Question 33

Rotor

Answer 33

Causes the target to rotate rapidly during x-ray production

Question 34

Functions of anode

Answer 34

Electrical conductor and provide mechanical support to the target and acts like a thermal radiator

Question 35

What are the three ways heat dissipates

Answer 35

Convection conduction and radiation

Question 36

Convection

Answer 36

Fan in tube

Question 37

Conduction

Answer 37

Stem of the anode

Question 38

Focal spot

Answer 38

The physical area of target bombarded by electrons during production

Question 39

Line focus principle

Answer 39

Is the relationship between the actual focal spot and the effective focal spot

Question 40

Actual focal spot

Answer 40

Where electrons in tube current hit the target

Question 41

Effective focal spot

Answer 41

Area the that the pt sees directly below the tube

Question 42

What is the advantage of A target Angle of 5-20'

Answer 42

Improves spatial resolution while maintaining heat Capacity

Question 43

Anode heel effect

Answer 43

As x-rays are emitted from the anode some are absorbed by the heel of the anode

Question 44

Are x-rays more intense on the cathode or anode side of the tube

Answer 44

Cathode side

Question 45

There can be a differenence as much as ___% from the anode heel effect

Answer 45

45%

Question 46

Advantages of anode heel effect

Answer 46

place Cathnode side of tube over thicker body part resulting in more evenly density on radiograph

Question 47

The smaller the focal spot the _____ the heel effect

Answer 47

Larger

Question 48

The heel affect is more noticeable with

Answer 48

Smaller anode angles, larger field size and short SID

Question 49

What causes pitting of the target

Answer 49

Excessive heat placed on anode

Question 50

What causes cracking of the anode

Answer 50

High techniques applied to cold anode

Question 51

Why is tungsten used for a filament and anode

Answer 51

It has a high melting point, high atomic number, thermal conductivity, and can withstand high tube currents without cracking or pitting

Question 52

Extra focal radiation

Answer 52

X-rays produced from outside the focal spot

Question 53

Why is extra focal radiation undesirable

Answer 53

Extends focal spot size, reduces image contrast, and increases patient dose

Question 54

Off focus radiation

Answer 54

Most focused radiation attenuated by tube housing And collimator located near window of glass envelope

Question 55

Anode cooling chart

Answer 55

Shows the time required for a heated anode to cool down

Question 56

Housing cooling chart

Answer 56

The time required for the whole housing unit it to cool down

Question 57

What are the four factors necessary for x-ray production

Answer 57

Separation of electrons, production of high-speed electrons, focusing of electrons, stopping high-speed electrons at target

Question 58

____% energy for X-rays, ___% converted to heat

Answer 58

1, 99

Question 59

Characteristic radiation

Answer 59

Created when a projectile electron interacts with an electron from an inner K she'll of the atom

Question 60

Only ____ shell energy can be used for X-rays

Answer 60

K

Question 61

Brems X-rays

Answer 61

The slowing down and breaking of electrons becoming X-ray photons