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