LRA 221 Final Exam Questions and Verified Answers - (2024/ 2025 Update) 100% Correct
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Course
LRA
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LRA
LRA 221 Final Exam Questions and Verified Answers - (2024/ 2025 Update) 100% Correct
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Q: Aliasing occurs when the sampling frequency is not greater than twice the frequency of the input signal.
a. True
b. False
Answer:
b. False
Q: In digital projection radiography, what ...
LRA 221 Final Exam Questions and Verified Answers - (2024/ 2025 Update) 100% Correct Q: Aliasing occurs when the sampling frequency is not greater than twice the frequency of the input signal. a. True b. False Answer: b. False Q: In digital projection radiography, what process is used to normalize an image that has been taken with too great of an exposure? a. High -pass filtering b. Low -pass filtering c. Automatic rescaling d. Aliasing Answer: c. Automatic rescaling Q: The look -up table that is used to determine the brightness and contrast of an image is unique for each anatomic part. a. True b. False Answer: a. True Q: Which processing technique will amplify particular known frequencies in an image while suppressing others? a. Edge enhancement b. High -pass filtering c. Masking d. All of the above Answer: d. All of the above Q: Window width controls the brightness of the image on the display. a. True b. False Answer: b. False Q: Shuttering the digital image will reduce the exposure to the patient. a. True b. False Answer: b. False Q: Which processing parameter will put together multiple images into one single image for display? a. Magnification b. Automatic rescaling c. Image orientation d. Image stitching Answer: d. Image stitching Q: Film and intensifying screens are primarily used in A) computed radiography (CR). B) digital radiography (DR). C) conventional radiography. D) picture archival and communication systems. Answer: C) conventional radiography. Q: CR acquires an image through: a. conventional film/screen processing using a digital scanner. b. the heating of a thermoluminescent device. c. an electrically charged cassette. d. the use of a storage phosphor plate. Answer: d. the use of a storage phosphor plate. Q: Technologist efficiency ratings are generally the same when comparing conventional radiography with radiography. a.) computed b.) digital Answer: a.) computed Q: The active element in a storage phosphor is: a.) lithium b.) glutaraldehyde c.) europium d.) Barium fluorohalide Answer: d.) Barium fluorohalide Q: In reference to PSP image capture, to release the latent image, which of the following devices is scanned over the phosphor plate? a.) photomultiplier tube b.) fluorescent light c.) focused laser light d.) lithium crystal Answer: c.) focused laser light Q: X-ray energy related to indirect capture DR will stimulate a , which eventually is changed into an electrical signal. a.) photodensitometer b.) scintillator c.) TFT array d.) charge -coupled device Answer: b.) scintillator Q: The converts x -ray energy directly to a digital electrical signal. a.) photoconductor b.) photomultiplier c.) scintillator d.) TLD Answer: a.) photoconductor Q: Exposure latitude is to conventional radiography as is to DR. a.) characteristic response b.) linear manner c.) subject contrast d.) dynamic range Answer: d.) dynamic range Q: A look -up table maps a.) latent images b.) subject contrasts c.) image grayscale values d.) optical density Answer: b.) subject contrasts Q: All of the following are components of a PACS except a.) independent kilovoltage peak and milliampere -second stations b.) web access c.) multiple interfaces
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