midterms Flashcards Preview

Radiography > midterms > Flashcards

Flashcards in midterms Deck (142)
Loading flashcards...
1

X-ray Machine Components

Tube-head
P.I.D. (Position Indication Device)
Extension Arm
Control Panel

2

radiation

A form of energy carried by waves or a stream of particles

3

x-radiation

A high-energy radiation produced by the collision of a beam of electrons with a metal target in an x-ray tube

4

x-ray

A beam of energy that has the power to penetrate substances and record image shadows on photographic film or digital sensors

5

radiograph

An image or picture produced on a receptor by exposure to ionizing radiation. A two-dimensional representation of a three-dimensional object

6

Radiology

The science or study of radiation as used in medicine; a branch of medical science that deals with the use of x-rays, radioactive substances and other forms of radiant energy in the diagnosis and treatment of disease

7

Radiography

The art and science of making radiographs by the exposure of film to x-rays

8

The ATOM consist of a central nucleus and orbiting

electrons

9

Nucleus contains

Protons: positively charged particles, Accelerated particles, specifically hydrogen nuclei

Neutrons: carry no electrical charge, Accelerated particles with mass of 1 and no electrical charge

10

The____ is located closest to the nucleus and has the _____ level

K shell

highest energy

11

Ionization Radiation

Radiation that is capable of producing ions by removing or adding an electron to an atom

12

Particulate radiation:

tiny particles of matter that possess mass and travel in straight lines at high speeds

13

Beta particles:

: fast moving electrons emitted from the nucleus of radioactive atoms

14

Cathode rays:

streams of high-speed electrons that originate in an x-ray tube

15

Alpha particles

Emitted from the nuclei of heavy metals and exist as two protons and neurons, without electrons

16

Wavelength

is the distance between the peaks or crest of a wave frequency

Energy moving through space

17

Frequency

= the number of crest in a given period of time determines the energy

18

The longer the wavelength

the less energetic the wavelength

19

The shorter the wavelength the

more energetic the wavelength.

20

1. Control Panel

On and off switch
Indicator light
Exposure button
Controls for kVp and mA

21

2. Extension Arm

Suspends the x-ray tube-head
Houses electrical wires
Allows movement of tube-head

22

3. Tube Head

Where x-rays are produced

23

Tube- head contains

Metal Housing
Insulating oil
Tubehead seal
X-ray tube
Transformer
Aluminum disks
Lead collimator
Position-indicating device (PID)

24

X-ray Tube

Heart of x-ray generating system

25

Leaded glass housing (envelope)

Prevents x-rays from escaping in all directions

26

Cathode

Purpose is to supply the electrons necessary to generate x-rays

27

Anode

purpose is to convert electrons into x-ray photons

28

Production of dental x-rays

1. Filament circuit is activated, filament heats up and thermionic emission occurs
2. Exposure button is pushed
3.Electrons strike the tungsten target, and their kinetic energy is converted to x-rays and heat

29

Primary radiation (primary beam):

refers to penetrating x-ray beam

30

Secondary radiation

X-radiation that created when primary beam interacts with matter (less penetrating than primary beam)