ARRT Registry Review covering for Image Production content area
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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What is the Moiré effect? | show 🗑
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What is the relationship between OID and magnification? | show 🗑
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How is the anode heel effect more prominent? | show 🗑
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What is the function of the back up timer? | show 🗑
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Technical factor that regulates receptor exposure: | show 🗑
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show | An increase of 7 inch SID compensates for every inch of OID
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show | Line pairs per millimeter (lp/mm) measure using a resolution test pattern. Line-spread function (LSP) measure using 10mm x-ray beam
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show | Modulation transfer function: measures the amount of information lost between the object and the IR
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show | SID is above or below the recommend focusing distance, the useful beam will not coincide with the angled lead strips at the lateral edges. Grid cutoff.
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kVp adjustments for increase in patient thickness | show 🗑
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Additive pathologies | show 🗑
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show | Osteoporosis
Osteomalacia
Pneumoperitoneum
Emphysema
Degenerative arthritis
Atrophic and necrotic conditions
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PSP Layers | show 🗑
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show | the number of bits required to describe the gray level that each pixel can take on
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show | pixel size is smaller and better image resolution results
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As FOV increases (fixed matrix size) | show 🗑
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show | The combination of highest milliampere seconds value and shortest SID
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How is image resolution improved? | show 🗑
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show | associated with image brightness changes
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Window width | show 🗑
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Reproducibility | show 🗑
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show | Quality assurance term use to describe consistency in exposure at adjacent mA station
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show | The effect of excessive OID decreases. However, increased SID usually requires a significant increase in exposure factors.
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Types of grids | show 🗑
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show | Upside-down focused grid
Off-focus grid
Off level/angulation error
Off center/lateral decentering
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Parallel/Non-focused grid | show 🗑
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Angled/focused grid | show 🗑
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show | Vibrate during the exposure to blur the grid lines.
Requires a connection to the imaging equipment and source of electricity.
Used only in table or wall mounted Bucky's.
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show | Used in tabletop or mobile radiography where there is no connection of the IR to the system.
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show | Occurs with focused grids only.
Grid lines are opposite of the beam's divergence.
Results in a loss of exposure along edges of image.
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Off-focus/focus-grid distance decentering error grid | show 🗑
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Off level/Angulation error | show 🗑
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show | Beam is not aligned to the center of the focused grid.
Beam divergence doesn't match the angle of the lead strips.
Results in overall loss of exposure.
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show | flat-field corrections, correction for noise reduction as a result of DEL dropout, rescaling, exposure field recognition, segmentation recognition, and histogram analysis
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show | DRC - postprocessing function
compresses the contrast scale, remove densities that obscure image details
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show | the amount of material necessary to decrease the intensity of the beam to one-half its original value, thereby effecting a change in both beam quality and quantity.
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Absorption | show 🗑
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Scattering | show 🗑
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Attenuation | show 🗑
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show | High grid ratio, low grid frequency (the number of lead strips per inch)
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show | The lower the kilovoltage, the less penetration, and shorter the scale contrast.
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X-ray beam off-center and off-off focus below the focusing distance | show 🗑
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show | the image below will show decreased receptor exposure
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show | A particular milliampere seconds value, regardless of the combination of milliamperes and time, will reproduce the same receptor exposure.
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Nyquist theorem | show 🗑
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Maximal spatial resolution in digital imaging | show 🗑
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Histogram | show 🗑
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Factors that affect histogram | show 🗑
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Exposure latitude | show 🗑
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show | look-up table
used as a reference to evaluate the raw information and correct the luminance values.
a characteristic curve that best matches the anatomic part being imaged.
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show | the less is the attenuation
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show | the greater the beam attenuation
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show | the greater beam attenuation
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Primary or Low-Voltage Circuit Devices | show 🗑
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Secondary Circuit | show 🗑
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show | Rheostat/mA selector
step down transformer
cathode filament
focal spot selector
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Primary Circuit is | show 🗑
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show | High Voltage (kV)
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show | High Amperage (mA)
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References | show 🗑
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show | Schmuck, H. (2023). RADT465 Unit 2 Image Production Worksheet (Unpublished course reference). University of Southern Indiana, Evansville, IN.
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