How the image is produced

Question 1

Xrays pass through

Answer 1

Soft tissues without obstruction

Whilst hard tissues such as enamel, dentine, cementum + bone prevent xrays from passing through

Question 2

Shadows are displayed

Answer 2

On film in areas where xrays have passed, the shadow becomes visible when the film is processed

Question 3

The image is stored

Answer 3

Within the emulsion on the film and is called the LATENT IMAGE

Question 4

How do we get the image? Intra oral films

Answer 4

1. Crystals of silver halide are sensitised by xrays during the exposure

Question 5

2.

Answer 5

During development process, they are converted to black metallic silver

Question 6

3.

Answer 6

Unsensitised silver halide are removed from the emulsion during fixing

Question 7

How does it look?

Answer 7

Soft tissues like pulp allows all X-ray photons to pass through to reach the film, hence soft tissues show dark on radiograph

Question 8

Denser tissues

Answer 8

Allow fewer photons to reach the film, resulting in less metallic silver being produced. Hence dense materials like enamel look white on a film

Question 9

What it shows?

Answer 9

Hard materials like metal fillings show on a processed film as intensely white areas as few if any xrays pass through

Question 10

Dentine + bone

Answer 10

Are less hard, shows as less white/pale grey on the film

Question 11

Soft tissues

Answer 11

Such as pulp or periodontal ligament will show on radiograph as dark areas because the many xrays have passed through + struck the film

Question 12

This principle

Answer 12

Works if items get in the way of the primary beam such as earrings, tongue piercing, glasses + appliances