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Rad Noise
Radiographic Noise
Question | Answer |
---|---|
Define radiographic noise. | Deterioration of the radiographic image. |
What is 2nd definition of radiographic noise? | Random background information detected but not contributing to image quality. |
Causes of radiographic noise. | Number of x-rays used to expose patient or mAs; limited absorption efficiency of x-rays in intensifying screens; randomness of x-rays to light conversion process |
Define radiographic mottle. | Given to nonuniform or nonhomogenous appearance of the recorded image, more commonly associated with high-speed recording systems. |
Film Graininess Mottle | Attributed to the random distribution of silver halide grains in emulsion. |
Screen Structure | Attributed to phosphor crystal size and concentration thickness of active layer. |
Quantum Mottle | Attributed to random absorption. |
Spatial Resolution | Ability to produce an accurate and clear image. |
How is spatial resolution measured? | In line pairs |
What is the name of the test pattern? | Line Pair Test Pattern |