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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.
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Question
Answer
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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