X-ray Tube Part 2

Question 1

2 principal parts of Induction Motor

Answer 1

Rotor

Stator

Question 2

Outside part of the enclosure

Answer 2

Stator

Question 3

Consists of series of electromagnets equally spaced around the neck of the tube

Answer 3

Stator

Question 4

Stator may either be

Answer 4

Permanent magnet or

Electromagnet

Question 5

An electromagnetic coil of copper wire that is connected to a power supply

Answer 5

Stator

Question 6

Sends pulses of energy to the stator which in turn induces motion into the anode assembly

Answer 6

Rotor controller

Question 7

Wire that transfers rotor controller to the stator

Answer 7

Stator cord

Question 8

Shaft inside the enclosure

Answer 8

Rotor

Question 9

Rotor is made of

Answer 9

Bars of copper and soft iron

Question 10

Works through electromagnetic induction

Answer 10

Induction motor

Question 11

Production of voltage across a conductor moving through a magnetic field

Answer 11

Electromagnetic induction

Question 12

Covert electricity into mechanical energy

Answer 12

Electric motor

Question 13

Current in each stator wirings induces

Answer 13

Magnetic field

Question 14

Are energized sequentially so that induced magnetic field rotates on the axis of the stator

Answer 14

Stator

Question 15

Short delay allows

Answer 15

The rotor to accelerate to its designated rpm while filament is heated

Question 16

Where the high voltage electrons hit the anode

Answer 16

Focal spot

Question 17

Focal spot is also known as

Answer 17

Target
Focus
Focal point

Question 18

Area around the anode that is exposed to electrons

Answer 18

Actual focal spot

Question 19

Area projected onto the patient

Answer 19

Effective focal spot

Question 20

Impacts the geometric resolution of the X-ray image

Answer 20

Focal spot

Question 21

Smaller the focal spot

Answer 21

Better spatial resolution

Question 22

Designed incorporated into the X-ray tube targets allowing large area of heating while maintaining a small focal spot

Answer 22

Line Focus principle

Question 23

Angling of the target

Answer 23

Line focus principle

Question 24

Diagnostic tube target angles allows

Answer 24

5 to 20 degrees

Question 25

Reduce the effective area of the focal spot

Answer 25

Line focus principle

Question 26

Effective focal spot is controlled by

Answer 26

Size of the actual focal spot | Anode target angle

Question 27

Electrons can rebound and interact with other areas

Answer 27

Off-Focal Radiation

Question 28

Control of Off Focal Radiation

Answer 28

Diaphragm (place bet the tube) | Collimator (reduce off focus rays)

Question 29

Produces two off focal spot sizes because of two diff target angles

Answer 29

Biangular Targets

Question 30

Radiation intensity on the cathode side is greater than the anode side

Answer 30

Anode-Heel Effect

Question 31

Heel effect is considered when

Answer 31

Positioning areas with diff thickness or density

Question 32

Placed over the area if greater density

Answer 32

Cathode side

Question 33

In full supine X-ray

Answer 33

Anode should be up | Cathode down

Question 34

Under the control of radiologic technologist

Answer 34

X-ray tube life

Question 35

Extended by using minimum radio graphic factors

Answer 35

Tube life

Question 36

Three forms of tube cooling

Answer 36

Radiation Convection Conduction

Question 37

Anode may glow red hot and emit infrared energy

Answer 37

Radiation

Question 38

Heat is conducted through narrow molybdenum neck to the rotor assembly

Answer 38

Conduction

Question 39

Glass enclosure raises temperature of the oil bath

Answer 39

Convection

Question 40

Warming the anode through a series of exposure and increasing the kVp settings, the anode will build up heat

Answer 40

Tube warm-up procedure

Question 41

Charts that guide radiologic technologist on the use of X-ray tubes

Answer 41

X-ray tube rating charts

Question 42

Three types of X-ray tube rating charts

Answer 42

Radiographic rating chart Anode cooling chart Housing cooling chart

Question 43

Conveys which radiographic technique is safe or unsafe

Answer 43

Radiographic rating charts

Question 44

A guide regarding the most common technical factor combinations that can be used without overloading the tube

Answer 44

Radiographic rating charts

Question 45

There are diff charts for

Answer 45

Filament use Speed of the anode Target angle Voltage rectification

Question 46

Given mA, any combination of kVP and time that lies below the mA curve

Answer 46

Safe

Question 47

Lies above the curve

Answer 47

Unsafe

Question 48

Has limited capacity for storing heat

Answer 48

Anode

Question 49

Thermal energy is measured in

Answer 49

Heat units (HU)

Question 50

Anode cooling chart: single-phase formula

Answer 50

HU = kVp x mA x time

Question 51

Anode cooling chart: three-phase / high frequency formula

Answer 51

HU = 1.4 x kVp x mA x time

Question 52

Heats in Joules formula

Answer 52

heat (J) = w x kVp x mAs

Question 53

1 HU =

Answer 53

1.4 J

Question 54

Used to determine the length of time required for complete cooling after any level of heat input

Answer 54

Anode cooling chart

Question 55

Maximum of 350,000 HU

Answer 55

15 minutes to cool down

Question 56

Tube housing have the capacity of ___ HU

Answer 56

1 to 1.5 million

Question 57

Complete cooling of tube housing

Answer 57

1 to 2 hours

Question 58

Permits the calculation of the time necessary for the housing to cool enough for additional exposures to be made

Answer 58

Housing Cooling charts

Question 59

Turn the anode

Answer 59

Induction Motor