COMPREHENSIVE IMAGE
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| One way to alter image contrast and/or density digitally is through | show 🗑
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| show | some change made to window width and/or window level
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| show | the number of gray shades, that is, image contrast
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| Change in window level affects change in | show 🗑
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| Windowing and other postprocessing mechanisms permit the radiographer to affect changes in the image and to produce "special effects" such as | show 🗑
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| Using fixed-mAs and variable-kVp technical factors, each centimeter increase in patient thickness requires what adjustment in kilovoltage? | show 🗑
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| A film artifact usually will appear as a plus-density (dark) artifact if it is produced before or after exposure? | show 🗑
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| show | after
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| show | fast
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| What does quantum mottle look like? | show 🗑
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| show | low mAs
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| show | high kVp
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| show | 1. identify automatic processing problems.
2. determine film sensitivity.
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| The sensitometric, or characteristic, curve is used to illustrate the relationship between exposure and | show 🗑
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| How does a sensitometric curve predict a film emulsion's response(speed, sensitivity)? | show 🗑
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| show | automatic processing efficiency and consistency
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| show | processing difficulties
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| The sensitrometric curve illustrates the effects of exposure and processing on | show 🗑
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| show | magnification
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| Shape distortion is a result of improper alignment of | show 🗑
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| show | foreshortening and elongation
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| show | their position in the body, when the part is out of the central axis of the x-ray beam, or when the central ray is angled
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| show | Off-focus
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| If FOV increases, pixel size | show 🗑
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| show | at the cathode end of the image
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| show | 1
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| Which of the following can affect histogram appearance? | show 🗑
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| show | foreshortening of the object
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| show | elongation of the object
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| show | as the target angle decreases, the effective focal spot decreases (providing improved recorded detail), but the actual area of electron interaction remains much larger (allowing for greater heat capacity)
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| Does a steep (small) target angle increases or decrease the heel affect? | show 🗑
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| show | how much of the patient (eg, 150-mm diameter) is included in the matrix
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| The factors that affect the recorded detail of traditional screen/film imaging are | show 🗑
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| show | change the exposed silver bromide crystals to black metallic silver, thus producing a manifest image
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| show | removes the unexposed silver bromide crystals from the emulsion and hardens the gelatin emulsion, thus ensuring permanence of the radiograph
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| show | Increasing the heat of the filament
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| A screen lag test is performed by radiographing a phantom using an empty cassette-image receptor, then loading it with film and leaving for it a few minutes. | show 🗑
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| Which of the following pathologic conditions require(s) a decrease in exposure factors? | show 🗑
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| show | 1. differential tissue absorption.
2. emulsion characteristics.
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| show | the production of energy in the form of light
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| show | low contrast
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| show | slow speed, low contrast, and more latitude.
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| Grid ratio is defined as | show 🗑
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| show | anode heel effect
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| show | 60 to 70kvp
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| how to find percentage difference between 2 numbers | show 🗑
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| The function(s) of automatic beam limitation devices include | show 🗑
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| Grid frequency refers to | show 🗑
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| Factors that contribute to an increase in the intensification factor generally function to increase or decrease resolution? | show 🗑
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| show | increase
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| show | 1. Grid ratio
2. Number of lead strips per inch
3. Amount of scatter transmitted through the grid
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| show | the thinner and less visible they will be on the finished radiograph
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| The function of a grid is to | show 🗑
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| show | the amount of primary radiation transmitted through the grid divided by the amount of scattered radiation transmitted through the grid
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| show | 1. solid state detector receptor plates.
2. direct-capture imaging system.
3. immediate image display.
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| show | anode heel effect
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| Over- or underexposure under the anode is usually the result of | show 🗑
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| Which of the following units is used to express resolution? | show 🗑
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| show | Images with excessively low contrast
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| show | MF = SID/SOD
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| show | MF = image size/object size.
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| The atomic number of the tissues under investigation is directly related to their | show 🗑
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| show | 30%
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| The violet light emited by the photostimulable phosphor (PSP) is transformed into the image seen on the CRT by the | show 🗑
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| The latent image appears as the PSP is scanned by | show 🗑
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| show | photo-stimulated luminescence
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| show | electrical energy representing the analog image
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| The electrical energy is sent to an analog-to-digital converter (ADC) where it is | show 🗑
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| Which of the following pathologic conditions are considered additive conditions with respect to selection of exposure factors? | show 🗑
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| show | 12° to 17°
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| show | image contrast
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| show | contrast
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| show | the curve's position on the log relative scale: When comparing two or more characteristic curves, the faster film lies
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| The faster the film speed, the less the | show 🗑
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| In digital imaging, pixel size is determined by | show 🗑
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| Antihalation backing is | show 🗑
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| How efficiently the phosphors detect and interact with the x-ray photons is termed | show 🗑
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| show | conversion efficiency
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| The greater the percentage of scattered radiation absorbed compared to absorbed primary radiation, the greater the | show 🗑
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| show | a small focal-spot size, largest practical SID, shortest possible OID, and slowest practical screen/film combination and avoiding motion of the part being imaged.
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Created by:
jen.