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RadBioFinal
| Question | Answer |
|---|---|
| Reducing the field size to the anatomic features of interest not only reduces patient exposure but also | increases completed image quality by decreasing scatter. |
| When a properly calibrated automatic exposure control (AEC) is not employed to obtain a uniform selection of technical x-ray exposure factors, well-managed imaging departments? | Make use of standardized technique charts that have been established for each x-ray unit in that facility. |
| ________________________ are the sensing devices most often used to measure skin dose directly. | Thermoluminescent dosimeters |
| 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 |
| Any image that must be repeated because of human or mechanical error during the production of the initial image is considered to be a repeat image. What effect does a repeat image have on the radiation dose received by the patient? | The patient’s skin and possibly the gonads, if they were in the included imaged area, receive a double radiation dose. |
| After some decades of experience with modern digital x-ray equipment and as a result of improvements in dosimetry estimates of the efficacy of shielding with modern equipment and techniques, professional and scientific societies are | modifying shielding practices in diagnostic radiology to discourage the use of patient gonadal shielding and fetal shielding. |
| The reason for discontinuing patient gonadal shielding and fetal shielding in diagnostic radiology is based on research that the use of such shielding may jeopardize the benefits of the radiologic examination because | an incorrectly placed shield within the collimated x-ray beam when an automatic collimator is used, can result in the lead in the shield obscuring anatomic information or interfering with the AEC system. |
| During a radiographic examination, which of the following combinations of technical exposure factors reduce patient radiation dose? | Higher kVp, lower mAs |
| Because multiple bony areas span the entire body, the radiation dose absorbed by the organ called bone marrow | cannot be measured by a direct method; it can only be estimated. |
| Which of the following procedures results in the lowest radiation effective dose to the patient? | Dual energy X-ray absorptiometry |
| 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. |
| Essentially all diagnostic medical procedures result in fetal exposures ______________, so that _______________________. | of less than 0.01 Gy; the risk of abnormality is very small |
| 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 |
| Reducing the field size to the anatomic features of interest not only reduces patient exposure but also | increases completed image quality by decreasing scatter. |
| While standing behind the control-booth barrier, a radiographer makes a radiographic exposure. The x-rays scattered from the patient’s body should ____________________. | scatter a minimum of 2 times before reaching any area behind the control-booth barrier. |
Created by:
nijahmone