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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 answer ✅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 answer ✅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 answer ✅Compton
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The SI unit of absorbed dose: a. Coulombs/kilogram b. Gray c. Curie d. Rad - correct answer ✅Gray The SI unit of radioactivity: a. Becqueral b. Rem c. Quality factor d. Curie - correct answer ✅Becqueral Measurement of positive and negative particles created when radiation ionizes atoms in the air: a. Becquerel b. Sievert c. Roentgen d. Curie - correct answer ✅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 answer ✅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 answer ✅Photons The height of a sine wave: a. wavelength b. altitude c. amplitude d. frequency - correct answer ✅Amplitude The number of x-ray waves passing a given point per unit of time: a. wavelength b. altitude
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c. amplitude d. frequency - correct answer ✅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 answer ✅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 answer ✅Postprocessing manipulation of the image Which of the following anatomical parts is NOT related to the others? a. Symphysis pubis b. Ischial spine c. Iliac crest
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d. the mathematical basis for film-screen imaging - correct answer ✅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 answer ✅Voxel A digital image is composed of rows and columns known as a: a. photonic image b. matrix c. digital d. cyborg assimilator - correct answer ✅Matrix Image brightness in computed radiography may be adjusted by: a. doubling the mAs b. changing the window level c. repeating the exposure
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d. using digital fluoroscopy - correct answer ✅Changing the window level 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 answer ✅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.
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documents all the inf - correct answer ✅The radiographer knowing the need for the contrast medium, checks the verbal consent box and proceeds with the procedure injecting the contrast medium. Infectious waste is placed in containers: a. made of lead b. properly labeled as to the type of waste therein c. that will be incinerated d. only made of plastic - correct answer ✅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 answer ✅Sharps containers Causing a patient to become apprehensive of being injured is called: a. assault b. battery
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c. false imprisonment d. invasion of privacy - correct answer ✅Assault Graphs that demonstrate the relationship between radiation received and the organism's response are called: a. response curves b. H & D curves c. dose-response curves d. radiation-threshold curves - correct answer ✅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 answer ✅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
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c. 0.05 rem d. 0.1 rem - correct answer ✅0.1 rem The secondary protective barrier used in room shielding must be at least how thick? a. 1/22 inch Al equivalent b. 1/16 inch Al equivalent c. 1/16 inch Pb equivalent d. 1/32 inch Pb equivalent - correct answer ✅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 answer ✅90 degree The transformer that operates on the principle of self-induction is the: a. step-up transformer b. step-down transformer
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c. induction transformer d. autotransformer - correct answer ✅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 answer ✅1/1000 second 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 answer ✅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
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b. focal-spot size c. AEC d. mAs - correct answer ✅mAs Which of the following angles is required for an AP projection of the sacrum? a. 5 degrees caudad b. 5 degrees cephalad c. 15 degrees caudad d. 15 degrees cephalad - correct answer ✅15 degrees cephalad The quantity of x-rays produced is directly controlled by: a. kVp b. mAs c. OID d. SID - correct answer ✅mAs The rule or law that governs changing technique using kVp is the: a. inverse square law b. density maintenance law c. reciprocity law
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d. fifteen percent rule - correct answer ✅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 answer ✅20 mAs, 70 kVp If SID is halved, what may be said about radiographic density? a. density doubles b. density is reduced by half c. density is reduced by one half of the mAs d. density is quadrupled - correct answer ✅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 answer ✅72"
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Neglect or omission of reasonable care defines: a. Respondeat superior b. Res ipsa loquitur c. negligence d. unintentional misconduct - correct answer ✅Negligence Bradycardia indicates a pulse of: a. more than 100 beats per minute b. fewer than 60 beats per minute c. greater than 90 d. less than 50 - correct answer ✅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 answer ✅Crash cart What instrument is used to measure blood pressure?
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a. crash cart b. suction unit c. defibrillator d. sphygmomanometer - correct answer ✅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 answer ✅20 R The minimum source-to-skin distance for fixed fluoroscopes is: a. 10 inches b. 12 inches c. 15 inches d. 18 inches - correct answer ✅15 inches The use of 1 mm of gonadal lead shielding on female patients may reduce gonad dose by up to:
