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Standard Definitions
Standard Definitions #D
| Question | Answer |
|---|---|
| (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
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