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RAD201 Exam 3
| Question | Answer |
|---|---|
| Total filtration of _______________________ for fixed x-ray units operating above 70 kVp is the regulatory standard. | 2.5-mm aluminum equivalent |
| When using digital fluoroscopy systems, making use of the last image hold feature can | be an effective dose reduction technique. |
| 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 generator settings are changed from one mA and time combination to another, the most that linearity can vary is | 10% |
| 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 minutes |
| Most fluoroscopic examinations employ a range of _____________ kVp for adult patients, depending on the body area being examined. | 75-110 |
| When an exposed computed radiography imaging plate is ready to be processed, an imaging reading unit is used to scan the photostimulable phosphor imaging plate with | a helium-neon laser beam. |
| Digital radiography images can be accessed | at several workstations at the same time, thus making image viewing very convenient for physicians providing patient care. |
| Luminance is determined by measuring the concentration of light | over a particular field of view. |
| 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 | 80 to 100. |
| Which of the following procedures results in the lowest radiation effective dose to the patient? | Dual energy X-ray absorptiometry |
| Which of the following must always be the first step in protection of the reproductive organs? | Adequate and precise collimation of the radiographic beam to include only the anatomy of interest |
| 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. |
| During a radiographic examination, which of the following combinations of technical exposure factors reduce patient radiation dose? | Higher kVp, lower mAs |
| A blotchy radiographic image that results when an insufficient quantity of x-ray photons reaches the image receptor is called | quantum noise, or mottle. |
| In the event that a pregnant patient is inadvertently irradiated | the radiation safety officer or the medical physicist should perform the calculations necessary to determine fetal dose. |
| 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. |
| ________________________ are the sensing devices most often used to measure skin dose directly. | Thermoluminescent dosimeters |
| Whenever scattered radiation decreases, the radiographer’s exposure | decreases. |
| If the intensity of the x-ray beam is inversely proportional to the square of the distance from the source, how does the intensity of the x-ray beam change when the distance from the source of radiation and a measurement point is tripled? | It decreases by a factor of 9 at the new distance. |
| Which part(s) of a diagnostic x-ray unit should not be touched while a radiographic exposure is in progress? | Tube housing, collimator, and high-tension cables |
| For C-arm devices with similar fields of view, the dose rate to personnel located within a meter of the patient is ____________ the dose rate to personnel from ______________. | comparable to; routine fluoroscopy. |
| Which of the following is another term for use factor (U)? | Beam direction factor |
| Which of the following adjustments in technical exposure factors decreases the production of scattered radiation during routine radiographic procedures? | Increase kVp and decrease mAs in compensation |
| The maximum weekly permitted equivalent dose for a controlled area must not exceed | 1 mSv. |
| For primary radiation, what is the term that represents a portion of beam-on time that the x-ray beam is directed at a primary barrier during the week? | Use factor |
| Who should determine the exact shielding requirements for a particular imaging facility? | Medical physicist |
| If the peak energy of the x-ray beam is 100 kVp, a protective lead apron must be the equivalent to at least which of the following measures? | 0.25-mm thickness of lead |
| When the time spent in a higher radiation area is reduced or limited, occupational exposure | is also reduced. |
| Scattered radiation to the lens of the eyes of diagnostic imaging personnel can be substantially reduced by the use of protective eyeglasses fitted with optically clear lenses that contain a minimal lead equivalent protection level of | 0.35 mm. |
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travis686