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Standard Definitions

Standard Definitions #D

QuestionAnswer
(Film)The sharpness of the Structural lines as recorded in the Radiographic image. (digital) The sharpness of the structural edges recorded in the image. Recorded Detail
The degree of blackening or opacity of an area in a radiograph due to the accumulation of black metallic silver following exposure and processing of a film Density (Density = Log) incident light intensity/transmitted light intensity
The measurement of the luminance of a monitor calilbrated in units of candela (cd) per sq meter on a monitor or soft copy. Brightness (density on a hard copy is the same as film.)
The visible differences between any two selected areas of density levels within the radiographic image. Radiographic contrast (film)
the processing algorithm (mathmatical codes used by the software to provide the desired image appearance) The default algorithm determines the inital processing codes applied to the image data. Image contrast of display contrast(digital)
The number of densities visible(or number of shadeas of grey) in digital images the term "grey scale" is used and referrs to the bit depth of the system Scale of Contrast (film)
slight differences between densities are present(low contrast)but the total number of densitites is increased. Long scale contrast
considerable or major differences between density are present (high contrast) but the total number of densities is reduced. Short scale contrast
The inherent ability of the film to record a long range of density levels on the radiograph Film latitude
Film latitude and film contrast depend upon the sensitometric properties of the film and the processing conditions, and are determined directly from the Characteristic H&D curve
The fixed characteristic of the receptor most DR have an esentially linear response to exposure, impacted by contrast resolution and quantization. Receptor contrast
The smallest exposure change or signal difference that can be detected. Contrast resolution
Number of bits per pixel Quantization
The range of exposure factors which will produce a diagnostic radiograph Exposure latitude (film)
The range of exposures which produces quality images at the appropriate patient dose Exposure latitude (digital)
The difference in the quality of radiation transmitted by a particular part as a result of the different absorption characteristics of the tissues and structures making up that part. Subject contrast (film)
the magnitude of the signal difference in the remnant beam. Subject contrast (digital)
Created by: nocturnalmom