X-Ray Definition Flashcards Preview

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Flashcards in X-Ray Definition Deck (9):
1

Production of x-Ray

1- X-Rays are produced by bombarding metals with high speed electrons
2-When electrons strike a metal target, large deceleration occur and radiation is produced in the X-Ray region of the E.M spectrum

2

Features of an x-Ray

Electrons are emitted from heated cathode by thermionic emission
Electrons are accelerated through a large potential difference and bombardments of metal
X rays are produce by leaving the tube via window

3

Intensity

It is the wave power per unit area and it affects the degree of blackening of the image

4

Hardness

It is the penetration of the x-ray beam, which determines the fraction of the intensity of the incident beam that can penetrate part of the body being x-rayed

Summary
The shorted the wavelength the greater the penetration

5

Quality of picture

The quality of the shadow depends on it's sharpness and contrast

6

Sharpness

A sharp image is one in which the edges of the organ is clearly defined

7

How to get a sharp image

The beam is made narrow by the geometry of the anode
The beam is limited by using apertures
A lead grid is placed in front of the film to absorb scattered x-ray photons

8

Contrast

It is the degree of blackening of the image between one organ and another

9

Half value thickness

It is the thickness of the medium required to reduce the transmitted intensity to on half of it's value