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digital radiography and image processing practice test 2024 EXAM QUESTIONS AND ANSWERS
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What is the purpose of a photostimulable phosphor plate? - ANSWER>>To store the image of the body part until processed
How many steps are required for indirect conversion of x-ray energy in DR systems? - ANSWER>>Two
What is the system used to view and store digital x-ray images called? - ANSWER>>PACS
What is the front of the imaging plate made of? - ANSWER>>A radiolucent material that does not absorb x-rays
What is the purpose of barium fluorohalide with europium in the imaging plate? - ANSWER>>To absorb the x-ray energy
What is the scanning method used for processing a CR plate? - ANSWER>>Laser beam
What converts light into an electrical signal in indirect conversion DR systems? - ANSWER>>Photodiode
What should be used with digital-based x-ray processors to ensure the ALARA concept is practiced?
When does quantum mottle occur in digital images? - ANSWER>>When there are not enough photons reaching the IR
How many steps are required for direct conversion DR processing? - ANSWER>>Two
What is the active viewing area on the viewing monitor called? - ANSWER>>Matrix
What is each square picture element in a digital viewing monitor called? - ANSWER>>Pixel
Which matrix size produces the best spatial resolution? - ANSWER>>3000 to 3000 matrix
What is the ability to distinguish anatomical structures of similar subject contrast called? - ANSWER>>Spatial resolution
What is the number of gray shades that a digital system can reproduce called? - ANSWER>>Dynamic range
What is the ability of the digital system to convert the x-ray input signal into a useful image called? - ANSWER>>Signal-to-noise ratio (SNR)
What does noise refer to in a radiographic image? - ANSWER>>Amount of information not useful in the image
What is the best quality radiographic image on the viewing monitor? - ANSWER>>High SNR, low noise
Which control on the viewing station adjusts density or brightness in the image? - ANSWER>>Window level
Which control on the viewing station controls contrast in the image? - ANSWER>>Window width
What is the computer software function that allows adjustment of the radiographic image after processing? - ANSWER>>Postprocessing
What is the universally accepted standard for exchanging radiographic images called? - ANSWER>>DICOM
What is the calibration of an image display system that ensures consistent gray scales called? - ANSWER>>DICOM gray-scale function
Which standard ensures effective communication between different information systems? - ANSWER>>Health Level-
What artifact will be shown in the radiographic image with inadequate exposure technique? - ANSWER>>Quantum mottle
What artifact occurs when grid lines are misaligned with the CR reader's laser light? - ANSWER>>Moire pattern
What artifact can occur if the CR imaging plate is not erased properly? - ANSWER>>Phantom or ghost images
What artifact is caused by noise in the digital system's electronics? - ANSWER>>Extraneous line pattern
What is the extensive image management system for storing, retrieving, and viewing digital radiographic images called? - ANSWER>>PACS
How long can a CR plate be exposed to light before it starts to erase? - ANSWER>>15 seconds
What is the processing technique that produces uniform density and contrast regardless of exposure?
