Ch 21
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| Latitude and contrast are _________ __________. | Inversely Related
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| Film Speed and emulsion layer thickness are _____ _____. | Directly Related (thicker emulsion=faster speed)
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| Film Speed and crystal size are _____ _____. | Directly related (larger crystals =faster film speed)
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| An _______ relationship exist between film resolution and crystal size | Inverse (smaller crystals=high resolution)
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| ________ is the ability to accurately image an object. | Resolution
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| Resolution is also known as _____, ______, ______ and ______. | Detail, Sharpness, Definition and Resolving Power
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| What are the characteristics of film? | Resolution, speed, contrast and latitude
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| Three factors that cause fog: | light, heat and radiation
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| The ______ is the density at no exposure or density inherent to the film. | Base plus fog
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| _________ is the ability of film to transmit light or ability of film to stop the transmission of light | Opacity
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| A ______ is referred to as a step wedge because of its shape | penetrometer
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| What is the formula for optical density? | OD=log10 Io/It
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| ___________ is the measurement of the characteristic responses of film to exposure and processing | sensitometry
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| The toe of the characteristic curve is controlled by? | Phenidone
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| _________ measures optical density and is required to provide an accurate reading of amount of light transmitted through the film. | Densitometer
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| Film speed and number of sensitivity specks are _______ _______. | directly related
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| _________ is the difference in adjacent densities. | Contrast
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| Amount of density a film produces for a given amount of exposure is the film ________. | Speed
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| Film resolution is determined by the size of the ______ ______ _________. | silver halide crystals
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| The shoulder of the characteristic curve is controlled by ______. | hydroquinone
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| A _______ _______ is used for testing, calibrating and monitor equipment. | step wedge
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| A step wedge is made of ________ and used in ______________ | aluminum; digital radiography
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| A step wedge is also known as a ____________. | penetrometer
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| Name three quality control test tools: | equipment, processor and intensifying screens
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| D log E curves are also known as: | characteristic, sensitometric and hurter & driffield(h&d) curves
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| The numbers that are displayed by a densitometer are known as: | optical density numbers
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| ___________ is the range of exposures that will produce densities within the diagnostic range. | latitude (also known as the fudge factor)
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| Left curve will demonstrate: _________ speed, ______contrast, ______ emulsion, ________ latitude and ______ detail. | fast, high, thicker, narrow, worse
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| Right curve will demonstrate: _______ speed, ______ contrast, ______emulsion, _____ latitude and ________ detail. | slow, lower, thinner, wide and best recorded.
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| Dmax is the maximum ________ allowed to be recorded on the film. | density
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| The straight line is also known as __________ and _________. | Gamma, body
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