chapter 21
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| What is sensitometry | show 🗑
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| show | sensitometry
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| show | *sensitometric methods
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| show | *qualified radiographer
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| show | equipment for sensitometric procedures
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| What is an increasingly thick uniform absorbers made of aluminum steps, sometimes use tissue equivalent plactic | show 🗑
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| What is another name for a penetrometer | show 🗑
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| How does the penetrometer create a step wedge on radiographic film | show 🗑
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| show | it reproduces the variables associated witha clinical situation
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| show | sensitometer
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| show | controlled intensity light source,optical step wedge image
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| *What reproduces the same amount of light each time it is triggered | show 🗑
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| *What are controlled by circuits that supply an exact quanity of to a capacitor that discharges to astroboscopic light when triggered | show 🗑
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| show | optical step wedge
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| The optical step wedge leaves a uniform and reproducible _________ to expose any film placed in the _________ over the optcal ste wedge | show 🗑
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| show | optical step wedge
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| show | 11 step wedge
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| show | 21 step wedge
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| *What wedge is perfect for processor quality control monitoring | show 🗑
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| show | *exhausted reducing agents and bromide ions
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| show | *with either the long axis of the step wedge parallel to the entrance rollers or with the light edge entering the processor first
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| show | densitometer
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| show | calibrated uniform light source, stage, light aperture, sensor arm, readout display, and calibration control
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| show | *densitomter
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| *The calibrating of the densitometer is done by pushing the __________ so that the sensor is in contact with the light source | show 🗑
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| *What is used to set the readout display of the densitometer to zero | show 🗑
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| show | *densitometer
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| show | *filter
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| *because films are sensitive to a wide range of exposures, their _______ are best visualized if the range is compressed into a logarithmic scale | show 🗑
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| When using a logarithmic scale with a base of _____ and increment of 0.3 represents a ____________ of exposure | show 🗑
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| What are the numbers displayed by the densitometer | show 🗑
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| What is the density range for radiographic film | show 🗑
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| *What is the ability of a film to stop light | show 🗑
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| What is normally shown as a graphic relationship between the amount of exposure and the resultant density on the film | show 🗑
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| Which axis is composed in a logarithmic scale | show 🗑
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| show | vertical density axis (y axis)
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| show | density log exposure or D log or E curves
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| show | D log or E curves
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| show | the base plus fog, toe, straight line gamma , shoulder, and maximum density Dmax
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| What represents the density at no exposure or the density that are inherent | show 🗑
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| show | base + fog
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| What is the ranges for the radiographic film density | show 🗑
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| True or False: the total base fog is seldom below OD 0.10 but should not exceed OD 0.22 | show 🗑
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| show | processing the film, fog density
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| show | OD 0.5 to 1.25
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| Why is the straight line portion of the curve fairly straight | show 🗑
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| show | the hyperactivity of the developer solution
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| show | phenidone
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| show | toe
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| What is the portion of the curve that is between the toe and the shoulder | show 🗑
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| What is the range of the diagnostic densities | show 🗑
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| What is the reducing agent that controls the heavy black tone later in the developer | show 🗑
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| show | shoulder
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| show | Dmax
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| show | highest
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| show | *the highest point on the D log or E curve
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| *What is the result of the exposure beyond Dmax | show 🗑
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| *why would there be less density beyond Dmax | show 🗑
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| show | *reversal or solarization
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| show | *bell shaped
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| what is the name of the film that is preexposed to Dmax | show 🗑
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| show | additional exposure
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| *What will cause a reversed duplicated image instead of a negative one | show 🗑
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| show | *additional exposure
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| show | resolution, speed, contrast, and latitude
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| What permit the analysis of speed, contrast, and latitude within the normal exposure ranges of the film | show 🗑
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| show | *extremely high or long intensity exposure
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| show | *they can overload
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| What is the ability to accurately image an object | show 🗑
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| show | resolution
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| How is resolution measured | show 🗑
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| What is the unit of resolution | show 🗑
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| show | by the size of the silver halide crystals
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| show | *small area
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| show | information
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| show | inverse
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| The smaller the crystal the _________ the resoluti on | show 🗑
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| The _________ the crystal, the lower the resolution | show 🗑
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| show | *silver halide crystals
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| What does poor resolution called | show 🗑
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| Although film graininess can be seen, what controls the radiographic film/screen system resolution | show 🗑
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| show | *false
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| What is the amount of density a film produces for a given amount of exposure | show 🗑
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| show | speed
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| show | size of the silver halide crystals
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| show | number of sensitivity specks and the thickness of the elmulsion
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| show | true
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| show | larger, faster
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| True or false: the film speed and the number of sensitivity specks are directly related | show 🗑
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| show | true
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| What will pprduce more film density | show 🗑
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| True or False: the film speed and thickness of emulsion are directly related | show 🗑
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| show | thicker, faster
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| show | slower
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| What is the point on the D log E curve where a density of OD 1.o + b+f is achieved | show 🗑
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| show | exposure point
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| What can determined by using the reciprocal of the exposure required to produce a given density | show 🗑
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| What does ______1______ exposure in R needed to produce speed point density (OD 1.0+b+f) | show 🗑
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| show | film speed
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| What will cause a visible change in film density | show 🗑
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| show | contrast
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| show | shoulder
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| True or False: steeper the slope the higher the contrast | show 🗑
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| What is controlled by the level of activity of the hydroquinone | show 🗑
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| show | Gamma
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| show | average gradient
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| show | average gradient
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| show | between 2.5 and 3.5
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| In radiography, what is the doubling the exposure with double the density | show 🗑
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| show | latitude
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| show | width
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| show | true
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| As contrast ________ latitude tends to _______ | show 🗑
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Created by:
rachel43