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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 CORRECT ANSWERS✅ 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 image contrast? a. Compton b. Coherent c. Photoelectric d. Pair production CORRECT ANSWERS✅ 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 CORRECT ANSWERS✅ Compton
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The SI unit of absorbed dose: a. Coulombs/kilogram b. Gray c. Curie d. Rad CORRECT ANSWERS✅ Gray The SI unit of radioactivity: a. Becqueral b. Rem c. Quality factor d. Curie CORRECT ANSWERS✅ Becqueral Measurement of positive and negative particles created when radiation ionizes atoms in the air: a. Becquerel b. Sievert c. Roentgen d. Curie CORRECT ANSWERS✅ Roentgen Linear energy transfer:
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a. the number of protons plus the number of neutrons b. the number of electrons plus the number of protons c. the number of electrons plus the number of neutrons d. the number of protons CORRECT ANSWERS✅ Number of protons plus number of neutrons X-rays travel as a bundles of energy called: a. protons b. phasers c. particles d. photons CORRECT ANSWERS✅ Photons The height of a sine wave: a. wavelength b. altitude c. amplitude d. frequency CORRECT ANSWERS✅ Amplitude The number of x-ray waves passing a given point per unit of time: a. wavelength
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b. altitude c. amplitude d. frequency CORRECT ANSWERS✅ Frequency In digital fluoroscopy, the image should be viewed on what device to take advantage of the digital capabilities? a. digital view box b. high-resolution monitor c. high-definition TV d. plasma TV CORRECT ANSWERS✅ High-resolution monitor A primary advantage of digital fluoroscopy: a. postprocessing manipulation of the image b. no radiation dose to the patient c. no fluoroscopist required d. lower cost CORRECT ANSWERS✅ Postprocessing manipulation of the image Which of the following anatomical parts is NOT related to the others? a. Symphysis pubis b. Ischial spine
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d. the mathematical basis for film-screen imaging CORRECT ANSWERS✅ A mathematical formula used to reconstruct the image in digital imaging In computed radiography, each pixel corresponds to a shade of gray representing an area in the patient known as a(n): a. pathology b. density c. voxel d. artifact CORRECT ANSWERS✅ Voxel A digital image is composed of rows and columns known as a: a. photonic image b. matrix c. digital d. cyborg assimilator CORRECT ANSWERS✅ Matrix Image brightness in computed radiography may be adjusted by: a. doubling the mAs b. changing the window level c. repeating the exposure d. using digital fluoroscopy CORRECT ANSWERS✅ Changing the window level
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The window level in computed radiography is the: a. area of the patient being irradiated b. amount of radiation needed to obtain the image c. midpoint of densities d. toe of the H & D curve CORRECT ANSWERS✅ Midpoint of densities A physician has ordered a CT scan of the chest on a patient from the psych floor. The exam requires a contrast medium to be given. The patient left the floor without a consent form being signed. Once in CT, it was discovered that there was no consent form. CT calls the floor to asks if there was anyone to give consent. The patient's 16-year old son is the only person available and he gives a verbal consent. What is the MOST appropriate action to be taken? a. The radiographer knowing the need for the contrast medium, checks the for verbal consent and proceeds with the procedure. b. The radiographer is aware that consent is necessary for the contrast medium, so she calls the floor and uses the verbal consent given by the patient's son. c. The radiographer is aware she cannot use the verbal consent from the son, so she sends the patient back to the floor and documents all the information and actions.
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b. properly labeled as to the type of waste therein c. that will be incinerated d. only made of plastic CORRECT ANSWERS✅ Properly labeled as to the type of waste therein Needles and syringes must be disposed of in: a. lead containers b. sharps containers c. plastic bags d. metal pans CORRECT ANSWERS✅ Sharps containers Causing a patient to become apprehensive of being injured is called: a. assault b. battery c. false imprisonment d. invasion of privacy CORRECT ANSWERS✅ Assault Graphs that demonstrate the relationship between radiation received and the organism's response are called: a. response curves b. H & D curves
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c. dose-response curves d. radiation-threshold curves CORRECT ANSWERS✅ 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 CORRECT ANSWERS✅ Artificially produced radiation Cataractogenesis does not occur at low levels of radiation exposure. Therefore it is best expressed by which of the following dose-response relationships? a. threshold b. nonthreshold c. low dose d. occupational dose CORRECT ANSWERS✅ Threshold Increased dose equals increased probability of effects best describes which of the following? a. stochastic effects b. deterministic effects
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d. 1/32 inch Pb equivalent CORRECT ANSWERS✅ 1/32 inch Pb equivalent The intensity of the scattered beam is 1/1000 the intensity of the primary beam at a ____ angle 1 meter from the patient. a. 45 degree b. 25 degree c. 90 degree d. 10 degree CORRECT ANSWERS✅ 90 degree The transformer that operates on the principle of self-induction is the: a. step-up transformer b. step-down transformer c. induction transformer d. autotransformer CORRECT ANSWERS✅ Autotransformer Electronic timers used in x-ray equipment allow for exposure times as low as: a. 1/100 second b. 1/1000 second c. 1 microsecond d. there is no limit to how short the exposure can be CORRECT ANSWERS✅ 1/ second
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To ensure consistency of radiographic quality from one exposure to the next, what device may be used? a. electronic timer b. automatic collimation c. automatic exposure control d. falling load generator CORRECT ANSWERS✅ Automatic exposure control (AEC) What happens when a predetermined level of ionization is reached in the ionization chamber? a. The unit shuts off because of a malfunction b. The maximum allowable time has been reached c. The highest allowable dose to the patient has been reached d. The exposure is terminated CORRECT ANSWERS✅ The exposure is terminated An x-ray machine that uses a continually decreasing mA for the shortest times possible uses a(n): a. AEC b. falling load generator c. ionization chamber d. phototimer CORRECT ANSWERS✅ Falling load generator
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a. kVp b. mAs c. OID d. SID CORRECT ANSWERS✅ mAs The rule or law that governs changing technique using kVp is the: a. inverse square law b. density maintenance law c. reciprocity law d. fifteen percent rule CORRECT ANSWERS✅ 15% rule Given an original technique of 10 mAs and 70 kVp, which of the following will produce a radiograph with double the density? a. 20 mAs, 80 kVp b. 30 mAs, 92 kVp c. 20 mAs, 70 kVp d. 15 mAs, 82 kVp CORRECT ANSWERS✅ 20 mAs, 70 kVp If SID is halved, what may be said about radiographic density?
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a. density doubles b. density is reduced by half c. density is reduced by one half of the mAs d. density is quadrupled CORRECT ANSWERS✅ Density is quadrupled What is the preferable SID for a lateral position of the cervical spine? a. 36" b. 40" c. 60" d. 72" CORRECT ANSWERS✅ 72" What is the name of the most proximal portion of the stomach? a. Pylorus b. Greater Curvature c. Fundus d. Body CORRECT ANSWERS✅ Fundus The contrast step used during sensitometric testing is located where on the H & D curve? a. toe
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d. less than 50 CORRECT ANSWERS✅ Fewer than 60 beats per minutes What item contains all equipment and drugs needed during respiratory or cardiac arrest: a. crash cart b. suction unit c. defibrillator d. sphygmomanometer CORRECT ANSWERS✅ Crash cart What instrument is used to measure blood pressure? a. crash cart b. suction unit c. defibrillator d. sphygmomanometer CORRECT ANSWERS✅ Sphygomomanometer If the radiation dose 6 feet from the x-ray table is 5 R, what is the dose at a distance of 3 feet? a. 20 R b. 10 R c. 1.25 R d. 2.5 R CORRECT ANSWERS✅ 20 R
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The minimum source-to-skin distance for fixed fluoroscopes is: a. 10 inches b. 12 inches c. 15 inches d. 18 inches CORRECT ANSWERS✅ 15 inches The use of 1 mm of gonadal lead shielding on female patients may reduce gonad dose by up to: a. 50% b. 75% c. 85% d. 95% CORRECT ANSWERS✅ 50% Cells that are oxygenated are more susceptible to radiation damage. This describes: a. Target theory b. direct effect c. doubling dose d. oxygen enhancement ratio CORRECT ANSWERS✅ Oxygen enhancement ratio
