12

described as a photographic or optical quality

its presence and difference across the surface of the film make the image visible

it defines the completeness of an image, it becomes the key to radiographic interpretation

without this, the other factors of definition may lose their significance because the film is uselessit reasuremr

it is also used to describe the nature of tissues, such as bones, characteristics of contrast media, and foreign body

tissue density (less dense to more dense) FMBT

radiographic density (less dense to more dense) TBMFL

an instrument used to measure density

measurement in densitometer are presented in

in medical radiography, optical density readings that are most useful are between

reading of 0.25

reading of 2.50