RADIOGRAPHY TERMS
MOTTLING - mottling is occurred in industrial radiography due to diffraction, this can be reduced by increasing KV and using lead foil screen.
in compare to 40kv film, 60kv film exposure film with time compensation film has lower contrast and greater latitude.
AVERAGE GRADIENT- It is a characteristic curve between exposure vs optical density.
LATITUDE- (X-Ray Film) the range of specimen thickness that can be adequately recorded on the radiography is referred to as the latitude.
RADIOGRAPHIC CONTRAST-difference in density from one area to another area on a radiography film is termed as Radiographic Contrast.
FILM DENSITY- The darkening of the radiography is referred to as density or Photographic Density.
tip- t1/t2 = old sfd2/new sfd2
X-RAY FILM WITH LARGE GRAIN SIZE HAVE HIGHER SPEED
LARGE GRAIN SIZE- HIGH-SPEED FILM
SMALL GRAIN SIZE- LOW-SPEED FILM
LARGER GRAIN- LOWER QUALITY FILM
SMALL GRAIN - HIGH-QUALITY FILM
PENUMBRAL SHADOW- because of geometrical factors such as source size, source to specimen distance and specimen to film distance, these can be a lack of perfect sharpness at the edge of indication.
EXPOSURE TIME- click for more information.
in compare to 40kv film, 60kv film exposure film with time compensation film has lower contrast and greater latitude.
AVERAGE GRADIENT- It is a characteristic curve between exposure vs optical density.
LATITUDE- (X-Ray Film) the range of specimen thickness that can be adequately recorded on the radiography is referred to as the latitude.
RADIOGRAPHIC CONTRAST-difference in density from one area to another area on a radiography film is termed as Radiographic Contrast.
FILM DENSITY- The darkening of the radiography is referred to as density or Photographic Density.
tip- t1/t2 = old sfd2/new sfd2
X-RAY FILM WITH LARGE GRAIN SIZE HAVE HIGHER SPEED
LARGE GRAIN SIZE- HIGH-SPEED FILM
SMALL GRAIN SIZE- LOW-SPEED FILM
LARGER GRAIN- LOWER QUALITY FILM
SMALL GRAIN - HIGH-QUALITY FILM
PENUMBRAL SHADOW- because of geometrical factors such as source size, source to specimen distance and specimen to film distance, these can be a lack of perfect sharpness at the edge of indication.
EXPOSURE TIME- click for more information.
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