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Exam 3 - Rad & Bio
Weeks 9 - 11
| Question | Answer |
|---|---|
| A blotchy radiographic image that results when an insufficient quantity of x-ray photons reaches the image receptor is called | quantum noise, or mottle. |
| Studies of groups such as the atomic bomb survivors of Hiroshima have shown that damage to the newborn is unlikely for doses below | 0.2 Gy. |
| Essentially all diagnostic medical procedures result in fetal exposures ______________, so that _______________________. | of less than 0.01 Gy; the risk of abnormality is very small |
| According to the American College of Radiology (ACR), abdominal radiologic examinations that have been requested after full consideration of the clinical status of a patient, including the possibility of pregnancy, need | Not be postponed or selectively scheduled. |
| In standard image intensification fluoroscopy, an x-ray beam half-value-layer (HVL) of 3 to 4.5 mm aluminum is considered acceptable when kVp ranges from: a. 50 to 60. b. 60 to 70. c. 70 to 80. d. 80 to 100. | d. 80 to 100. |
| During a fluoroscopic examination, a resettable cumulative timing device measures the x-ray beam-on time and sounds an audible alarm or in some cases temporarily interrupts the exposure after the fluoroscope has been activated for what length of time? | 5 mins |
| When generator settings are changed from one mA and time combination to another, the most that linearity can vary is: | 10% |
| Total filtration of _______________________ for fixed x-ray units operating above 70 kVp is the regulatory standard. | 2.5 mm aluminum equivalent. |
| Computed radiography, because of its higher exposure latitude, makes grid use on the pediatric population | less necessary than was previously believed. |
| Digital radiography images can be accessed | at several workstations at the same time, thus making image viewing very convenient for physicians providing patient care. |
| Which of the following materials is commonly used in the tabletop of a radiographic examination table to make the tabletop as radiolucent as possible so that it will absorb only a minimal amount of radiation, thereby reducing the patient’s radiation dose? | Carbon fiber material |
| When obtaining a dorsoplantar projection of a foot, which of the following types of filters should be used to provide a greater uniform density of the anatomy? | Wedge Filter |
| When performing a mobile radiographic procedure, to reduce the radiation exposure to the patient, the radiographer must use a minimal source-skin distance of at least | 30 cm |
| In digital radiography the number of different shades of gray that can be stored in memory and displayed on a computer monitor is termed | Grayscale |
| ____________ are the sensing devices most often used to measure skin dose directly. | Thermoluminescent dosimeters |
| According to the U.S. Public Health Service, the genetically significant dose (GSD) for the population of the United States is approximately | 0.20 mSv. |
| During a radiographic examination, which of the following combinations of technical exposure factors reduce patient radiation dose? | Higher kVp, lower mAs |
| Which of the following must always be the first step in protection of the reproductive organs? | a. Adequate and precise collimation of the radiographic beam to include only the anatomy of interest |
Created by:
bmairet