Radiographic Imaging Chapter 6 Vocabulary

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1

Actual Focal spot

The physical area of the focal track that is impacted.

2

Anode

The positive side of the x-ray tube, serves as a target surface for high voltage electrons from the filament, conducts the high voltage from the cathode back into the x-ray generator circuitry, and serves as the primary thermal conductor.

3

Anode Assembly

Consists of the anode, stator. and rotor.

4

Anode cooling chart

Permits the calculation of the time necessary for the anode to cool enough for additional exposures to be taken.

5

Anode heel effect

Due to the geometry of the angled anode target, the radiation intensity is greater on the cathode side.

6

Cathode

The negative side of the x-ray tube; produces a thermionic cloud, conducts the high voltage to the gap between the cathode and anode, and focuses the electron stream as it heads for the anode.

7

Cathode assembly

Consists of the filament, focusing cup, and associated wiring.

8

Dual focus

A two-filament arragngement within the x-ray tube.

9

Effective focal spot

The area of the focal spot that is projected out of the tube toward the object being radiographed.

10

envelope

The entire cathode and andoe assembly is housed within the glass or metal structure.

11

Extrafocal radiation

Photons that were not produced at the focal spot; also called off-focus radiation.

12

filament

A small coil of thin thoriated tungsten wire.

13

Focal point

The portion of the anode where the high-voltage electron stream will impact.

14

Focal spot

The portion of the anode where the high-voltage electron stream will impact.

15

Focal track

The portion of the anode where the high-voltage electron stream will impact. when discussing a rotating anode, this describes the circular path that will be impacted by the electron beam.

16

Focus

The portion of the anode where the high-voltage electron stream will impact.

17

Focusing cup

A shallow depression in the cathode assembly designed the house filament.

18

fractional focal spot

A very small focal spot usually a fraction of a fraction of a millimeter in size.

19

grid-biased

A type of tube that quickly regulates the flow of electrons, producing x-ray photons.

20

grid-controlled

A type of tube that quickly regulates the flow of electrons, producing x-ray photons.

21

grid-pulsed

A type of tube that quickly regulates the flow of electrons, producing x-ray photons.

22

Housing cooling chart

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

23

leakage radiation

Any photons that escape from the housing except at the port.

24

line-focus principle

Used to reduce the effective area of the focal spot.

25

off-focus radiaiton

Photons that were not produced at the focal spot; also called extrafocal radiation

26

protective housing

The entire cathode and anode assembly is housed within this metal structure.

27

radiographic tube rating chart

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

28

rotating anode

An andoe assembly that turns during exposure.

29

rotor

A hollow copper cylinder or cuff that is attached to the anode disk by a molybdenum shaft.

30

saturation current

as kVp increases, a greater percentage of the thermionically emitted electrons are driven toward the anode.

31

space charge effect

As more and more electrons build up in the area of the filament, their negative charges being to oppose the emission of additional electrons.

32

stationary anode

An anode assembly that is immobile

33

stator

Induction-motor electromagnets that turn the anode

34

target

The portion of the anode where the high-voltage electron stream will impact.

35

tube rating chart

provides a guide regarding the most common technical factor combinations that can be used without overloading the tube.

36

window

A structure where the primary x-ray beams exits the envelope, which allows less absorption or scatter of photons.