Radiographic density

Question 1

The degree of overall blackening on a radiographic image

Answer 1

DENSITY

Question 2

CONTROLLING FACTOR AFFECTING RADIOGRAPHIC DENSITY

Answer 2

• MilliAmperage-Second (mAs)
• Determines the number of photons produced by the x-ray tube
• (mA) x (exposure time)

Question 3

• If mAs is doubled, the radiographic density will double
• If mAs is halved, the radiographic density will be halved
• 1 mAs = 1 Density

Answer 3

mAs and radiographic density have a directly proportional relationship

Question 4

The intensity of radiation at a given distance from the point source is inversely proportional to the square of the distance (INVERSE SQUARE LAW)

Answer 4

DISTANCE - can affect (no. of e) quantity

Question 5

• Measurement of the blackness of a film → Densitometer
• Defined as the based 10 logarithm of the opacity

Answer 5

OPTICAL DENSITY (FILM DENSITY)

Question 6

the ratio of light incident on the film (I0) to the light transmitted by the film (It)

Answer 6

Opacity

Question 7

5 Basic Radiographic Densities

Answer 7

1. AIR
2. FAT
3. SOFT TISSUE/FLUID
4. MINERAL (BONE)
5. METAL

Question 8

The study of how film emulsion respond to radiographic exposure

Answer 8

SENSITOMETRY

Question 9

a graph which illustrates the manner to which a film or film-screen system responds to different levels of exposure. It is plot with the Log of Exposure on the horizontal axis and the Optical Density on the vertical axis

Answer 9

Characteristic Curve

Question 10

• Done by exposing different parts of the film to the same intensity of radiation but varying the
• duration of exposure (TIME-SCALE SENSITOMETRY)
• Intensity of radiation (INTENSITY.
  SCALE SENSITOMETRY)

Answer 10

EXPOSED & PROCESS THE FILM