Mosby Challenge Test 1 Questions with Complete Solutions, A+

Attenuation: A. Is radiation that emerges from the patient B. Describes changes in the x-ray beam as it travels through the patient C. Produces only scatter radiation D. Occurs only at doses used in radiation therapy B. Describes changes in the x-ray beam as it travels through the patient Which photon-tissue interaction makes radiography possible because of its creation of contrast? A. Compton B. Coherent C. Photoelectric D. Pair production C. Photoelectric Which photon-tissue interaction produces radiation that may expose others in the room during fluoroscopy? A. Compton B. Coherent C. Photoelectric D. Pair production A. Compton The unit radiation absorbed in air is the: A. Sv B. Gy-a C. Bq D. Gy-t B. Gy-a The unit of radioactivity is the: A. Becquerel B. Gray-t C. Sievert D. Gray-a A. Becquerel The unit of effective dose is the: A. Becquerel B. Gray-t C. Sievert D. Gray-a C. Sievert Linear energy transfer: A. Is the same for all types of radiation B. Is the same for wave and particulate radiations used in diagnosis and treatment C. Occurs only during x-ray procedures D. Varies for different types of radiation D. Varies for different types of radiation The unit of the Bq would be used in what image modality? A. Radiography B. CT C. MRI D. Nuclear medicine D. Nuclear medicine Graphs that show the relationship between radiation received and the organism's response are called: A. Response curves B. Exposure curves C. Dose-response curves D. Radiation-threshold curves C. Dose-response curves Medical x-rays are an example of: A. Natural background radiation B. Artificially produced radiation C. Nonionizing radiation D. Ionizing, natural background radiation B. Artificially produced radiation Cataractogenesis does not occur at low levels of radiation exposure; it is best expressed by which of the following dose-response relationships? A. Threshold B. Nonthreshold C. Low dose D. Occupational dose A. Threshold Increased dose equals an increased probability of effects best describes which of the following? A. Stochastic effects B. Deterministic effects C. Direct effect D. Indirect effect A. Stochastic effects