INSTANT DOWNLOAD COMPLETE TEST BANK WITH ANSWERS
Clinical Imaging 3rd Edition by Marchiori – Test Bank
Chapter 01: Plain Radiographic Imaging
- Because electron potential energy is greater the farther away a bound electron is from the nucleus, what results from an outer shell electron falling into an inner shell vacancy?
|a.||The size of the nucleus increases.|
|b.||The atomic weight of the element increases.|
|c.||The binding energy of the outer shell electron decreases.|
|d.||Electromagnetic energy is released.|
|e.||The nucleus emits a proton.|
- How much energy is released when a K-characteristic x-ray is emitted from a given element?
|a.||The difference in binding energy between a K-shell electron and an L-shell electron.|
|b.||Energy equal to the kVp.|
|c.||The sum of the energies of the K-shell electron and the L-shell electron.|
|d.||Energy equal to the potential energy of the K-shell electron.|
- Select the entire energy range that represents diagnostic x-rays.
|a.||70 kilo-electron volts (keV) to 90 keV|
|b.||40 keV to 125 keV|
|c.||40 keV to 150 keV|
|d.||70 keV to 150 keV|
|e.||125 keV to 300 keV|
- A scattered x-ray is an x-ray that __________.
|a.||has changed direction with a resulting increase in frequency and decrease in wavelength|
|b.||has changed direction with no subsequent change in frequency or wavelength|
|c.||has changed direction with an increase in both frequency and wavelength|
|d.||leaks out of the x-ray tube housing|
|e.||changes direction with a resulting increase in wavelength and decrease in frequency|
- Select the relationship of wavelength to frequency in an electromagnetic waveform.
- Which statement is true of the anode heel effect?
|a.||The intensity of the x-ray beam is greater on the anode side of the tube.|
|b.||The heel effect is more evident when using the small focal spot.|
|c.||The heel effect is less evident at longer focal film distances.|
|d.||The heel effect is more evident with smaller exposure areas.|
|e.||Filtration minimizes the heel effect.|
- Which of the following is a variable aperture beam-limiting device?
|e.||None of the above|
- Which one of the following controls the initiation of electron flow from cathode to anode?
|b.||mA control knob|
|d.||Line voltage compensator|
- Choose the electrical requirements necessary to operate a 300/125 x-ray machine that is hard-wired into a chiropractic office in the United States.
|a.||110 volts; 100 amps; 60 Hz; AC|
|b.||110 volts; 60 amps; 60 Hz; AC|
|c.||220 volts; 20 amps; 60 Hz; DC|
|d.||220 volts; 100 amps; 60 Hz; AC|
|e.||220 volts; 100 amps; 60 Hz; DC|
- A lateral cervical spine view is taken at a 40-inch FFD using 70 kVp, 100 mAs, and .2 second. If the FFD were changed to 60 inches, which of the following techniques would produce the same exposure to the film as the original?
|a.||100 mA, .5 second, 70 kVp|
|b.||300 mA, .15 second, 70 kVp|
|c.||300 mA, .1 second, 70 kVp|
|d.||200 mA, .044 second, 70 kVp|
|e.||100m A, .088 second, 70 kVp|
- According to federal standards, a 90-kVp beam requires which of the following measurements to be the equivalent of aluminum of total filtration to minimize soft radiation exposure to patients?
- Which type of generator will produce the greatest effective tube current when identical exposure factors are used?
|a.||Single-phase, half-wave rectified|
|b.||Single-phase, full-wave rectified|
|e.||100 KHz high frequency|
- What is the function of the high voltage circuit within the x-ray tube?
|a.||To drive electrons from cathode to anode|
|b.||To select filament size|
|c.||To create a space charge for x-ray production|
|d.||To rectify filament current|
|e.||To activate the rotor|
- Why is rectification of AC to DC important to the operation of the x-ray tube?
|a.||To reduce the heel effect|
|b.||To help maintain a small effective focal spot|
|c.||To save on electricity|
|d.||To protect the cathode side of the tube from electron bombardment|
|e.||To reduce the electrical load on the anode|
- The penetration of the x-ray beam is increased under which condition?
|a.||As kVp is decreased|
|b.||As kVp is increased|
|c.||As mA is decreased|
|d.||As mA is increased|
|e.||As time is increased|
- Which of the following combinations would produce the smallest effective focal spot?
|a.||Using the large filament with a small anode angle|
|b.||Using the small filament with a small anode angle|
|c.||Using a small filament with a large anode angle|
|d.||Using a large filament with a large anode angle|
|e.||Using a small filament and no focusing cup|
- Which of the following control console selectors determines focal spot selection?
|e.||Line voltage compensator|
- Where does controlled thermionic emission physically take place?
- Select the advantage automatic exposure control (AEC) has over other methods of determining x-ray exposure time.
|a.||Requires less exposure time than other methods to produce the same radiographic results.|
|b.||Results in less patient dose from soft radiation.|
|c.||Accounts for variations in patient density in determining appropriate exposure time.|
|d.||Requires no clinical knowledge of the role of mA and kVp.|
|e.||Demonstrates no dramatic advantage over manual methods of determining exposure time.|
- Which component part is designed specifically to prevent leakage radiation?
|b.||Glass x-ray tube|
- What would result if a focusing cup were not employed in an x-ray tube?
|a.||The heel effect would be decreased.|
|b.||Electrical loading of the anode would be increased.|
|c.||Effective focal spot sizes would be considerably larger.|
|d.||X-rays would be impossible to focus.|
|e.||Nothing would change.|
- What advantage does a rotating anode tube have over a stationary anode tube?
|a.||The voltage never drops to zero.|
|b.||A rotating anode produces a higher-quality beam.|
|c.||Voltage from the entire sine wave may be used.|
|d.||A rotating anode is capable of a greater electrical load.|
|e.||X-rays are more easily dispersed with a rotating anode.|
- Select the tube functions that are initiated by the rotor switch.
|a.||Anode rotation; line-voltage compensation|
|b.||Changing AC to DC; x-ray exposure|
|c.||Anode rotation; collimation|
|d.||Filament current; anode rotation|
|e.||Anode rotation; x-ray exposure|
- When screen film is used as the image receptor, which one of the following is true?
|a.||As speed increases, detail improves.|
|b.||As speed increases, noise (graininess) increases.|
|c.||As noise increases, detail improves.|
|d.||As speed increases, quantum mottle decreases.|
|e.||Speed has no effect on detail.|
- Identify the active ingredient in film emulsion that renders the film sensitive to light.
- If 40 mAs are needed to produce an adequate exposure for a given projection using a 200-speed imaging system, how many mAs would be needed if the speed were changed to 800?
- Collimating an exposure field to the film size or less has what result on image contrast compared to no collimation (wide-open field)?
- A radiograph demonstrates uneven exposure across the film laterally (side-to-side). What is the most likely cause of this manifestation?
- The primary purpose for using a radiographic grid is to __________.
|a.||reduce the amount of scatter radiation generated in the patient|
|b.||increase radiographic contrast|
|c.||reduce patient dose|
|e.||reduce air-gap magnification|
- What represents the tube distance whereby x-ray beam divergence is perfectly accommodated by the grid?
- Of the following grid specifications, which one is most significant in determining contrast improvement?
- Under which circumstance will using a grid be most effective?
|a.||When performing all extremity radiography|
|b.||When using less than 70 kVp|
|c.||When the patient part measures greater than 10 cm|
|d.||When using very fast (1200-speed), rare earth-imaging systems|
|e.||When radiographic contrast is not a concern|
- Under which of the following conditions will production of scatter radiation increase?
|a.||Low kVp, high mAs|
|b.||Small body part size|
|d.||Large exposure field size|
|e.||Recumbent radiography (compared to upright)|
- Select the property of an intensifying screen that helps reduce patient dose.
|a.||Protects the radiographic film from light exposure|
|b.||Prevents scatter from fogging the film|
|c.||Increases image detail|
|d.||Converts the energy of x-rays to visible light|
|e.||Intensifies the absorption of scatter radiation|
- Rare earth-intensifying screens are superior to calcium tungstate screens in that rare earth screens are characterized by which of the following?
|a.||They are less expensive.|
|b.||They require less radiation, resulting in shorter exposure time.|
|c.||They eliminate distortion.|
|d.||They have a built-in scatter control mechanism.|
|e.||They produce less penumbra.|
- Which is true when using a high-mA, low-kVp technique?
|a.||There will be an increase in the photoelectric effect.|
|b.||There will be an increase in Compton’s effect.|
|c.||There will be a decrease in patient dose.|
|d.||Radiographs will display lower contrast (more gray).|
|e.||The x-ray beam will be more penetrating.|
- How are Bremsstrahlung x-rays produced?
|a.||A target electron is displaced and replaced.|
|b.||A target electron is excited.|
|c.||A target electron is absorbed.|
|d.||A projectile electron is absorbed.|
|e.||A projectile electron loses kinetic energy.|
- Which interaction results from a high-speed electron knocking out an inner-shell electron, an outer-shell electron falling into the inner shell vacancy, and an x-ray photon being emitted?
- Under which condition would it be best to simply use the 15% rule for kVp?
|a.||The optimum kVp is used, and the film is overexposed.|
|b.||The film is blurred.|
|c.||The density is adequate, but the contrast is poor.|
|d.||The image is underexposed, and bone is difficult to see.|
|e.||There is never a condition for this use.|
- Apply the 30% rule to a film that was underexposed using 100 mA, .4 second, and 75 kVp. Which answer is correct?
|a.||200 mA, .26 second, 75 kVp|
|b.||100 mA, .8 second, 75 kVp|
|c.||100 mA, .28 second, 75 kVp|
|d.||100 mA, .4 second, 97 kVp|
|e.||300 mA, .09 second, 75 kVp|
- Which of the following series arranges patient densities in order of most radiolucent to most radiopaque?
|a.||Bone, muscle, fat, gas|
|b.||Gas, muscle, fat, bone|
|c.||Bone, fat, muscle, gas|
|d.||Gas, fat, muscle, bone|
|e.||Bone, metal, muscle, gas|
- A patient has a lateral scoliosis of the lumbar spine. In taking the lateral lumbar radiograph, what should be done to minimize projectional distortion?
|a.||Take a recumbent radiograph.|
|b.||Decrease exposure time and increase milliamperage.|
|c.||Direct the x-ray beam into the convexity of the curvature.|
|d.||Direct the x-ray beam into the concavity of the curvature.|
|e.||Increase the FFD to use more of the central portion of the x-ray beam.|
- Under which circumstance will recorded detail be greatest?
|a.||Long FFD/short object-film distance (OFD)|
|b.||Short FFD/long OFD|
|c.||Long FFD/long OFD|
|d.||Short FFD/short OFD|
|e.||None of the above|
- Select the technique that would produce a film with the highest contrast on an AP lumbo-pelvic projection.
|a.||300 mA, .05 second, at 90 kVp|
|b.||300 mA, .15 second, at 75 kVp|
|c.||300 mA, .1 second, at 80 kVp|
|d.||300 mA, .06 second at 85 kVp|
|e.||300 mA, .03 second, at 100 kVp|
- Noise factors like fog, quantum mottle, and inherent film graininess have the greatest effect on which of the following?
|e.||Visibility of detail|
- Wide exposure latitude is a benefit of which system of radiographic technique?
|a.||Fixed mAs/variable kVp|
|b.||Fixed mAs/fixed kVp|
|c.||Variable mAs/low kVp|
|d.||Variable mAs/fixed (optimum) kVp|
|e.||All of the above|
- What does “the maximum kVp capable of consistently producing diagnostically acceptable radiographs” define?
|a.||Optimum mAs technique|
|b.||Variable kVp technique|
|c.||Optimum kVp technique|
|d.||Low kVp technique|
|e.||High mAs technique|
- Which condition would best control for postexposure fog from safelight in an average-sized darkroom (6- x 8-foot) using blue or green sensitive film?
|a.||Using a single 7.5-watt red safelight (direct) at least 4 feet away from the film handling area|
|b.||Using several 7.5-watt red safelights strategically placed beyond 4 feet from the film handling area|
|c.||Using a 15-watt red safelight (direct) at least 4 feet away from the film handling area|
|d.||Using a 7.5-watt orange safelight (direct) at least 4 feet from the film handling area|
|e.||Using a 15-watt orange safelight and employing an indirect method|
- Which statement best describes the function of the developer?
|a.||The developer clears the film of unexposed silver.|
|b.||The developer shrinks and hardens the emulsion.|
|c.||The developer provides archival quality to the film.|
|d.||The developer converts the latent image into the manifest image.|
|e.||The developer stops the reduction process.|
- Which compound is responsible for making film black upon processing?
- Select the most noticeable film changes resulting from variable developer temperatures beyond the norm.
|d.||Image distortion changes|
- What happens to film density as the reducing agents in the developer are depleted?
|a.||Film density is increased.|
|b.||Film density is decreased.|
|c.||No change occurs.|
- Select the safest time in which to x-ray a female of childbearing potential in the lumbo-pelvic region where the risk of exposing a fetus is lowest.
|a.||10 days after the onset of menses|
|b.||10 days before the onset of menses|
|c.||10 days before ovulation|
|d.||The first 10 days of pregnancy|
|e.||10 days after menses ceases|
- Which one of the following adheres to the ALARA concept?
|a.||Long exposure times|
|e.||High mAs, low kVp technique|
- Under which condition would it be reasonable to not use gonad shielding?
|a.||The patient requests it, and it will not compromise the examination.|
|b.||The gonads are in the primary field of exposure.|
|c.||The examination will be compromised by using the shielding.|
|d.||The gonads are within 5 cm of the primary exposure field.|
|e.||There are no good reasons not to use gonad shielding.|
- Which in the following types of radiation has the highest photon energy?
- Which in the following units of radiation measure is most important for radiation protection reporting of occupational exposure?
- What percent of the kinetic energy of high-speed electrons striking the anode in an x-ray tube is converted to produce x-rays?
- Heating the tungsten filament in the cathode of an x-ray tube boils off electrons in a process called __________.
- The disk, stem, and rotor make up which component of the x-ray tube?
- Which of the following would decrease both the actual and effective focal spots?
|a.||Increasing anode angle|
|b.||Decreasing anode angle|
|c.||Increasing filament size|
|d.||Decreasing filament size|
|e.||Rotating the anode|
- What is the total thickness equivalent of aluminum required on an x-ray tube to reduce patient exposure to very low energy x-rays?
- Which type of x-ray generator would produce the greatest patient dose of lower energy soft x-rays?
|a.||Single phase 1 pulse|
|b.||Single phase 2 pulse|
|c.||Three-phase 6 pulse|
|d.||Three-phase 12 pulse|
- Which of the following would produce the greatest film density?
|a.||4 mA X 2 seconds|
|b.||10 mA X 2.5 seconds|
|c.||15 mA X 1.0 seconds|
|d.||20 mA X 0.5 seconds|
|e.||25 mA X 1.0 seconds|
- Which of the following timing devices decreases the need for repeat radiographs by adjusting for patient density and reducing human error in exposure calculation?
- X-ray quality, or penetrating power, is directly proportionate to __________.
|d.||anode heal effect|
- What new mAs setting would be needed to maintain the same film density achieved with a technique of 4 mAs at 40 inches focus-to-film distance (FFD), if FFD is increased to 80 inches?
- What type of radiation is responsible for the majority of x-rays produced in a diagnostic x-ray beam?
- What material in an x-ray grid is primarily responsible for reducing scattered x-rays?
- Which of the following layers of an x-ray film contains silver crystals?
- What is the minimum change in mAs needed to make a perceptible difference in film density?
- At what distance is a parallel grid likely to show the greatest amount of grid cut off?
- Which of the following steps in chemical development of radiographs is most sensitive to time, temperature, and chemical concentration?
- Physical changes to radiographic film caused by exposure to light or x-ray that prior to developing are invisible to the naked eye are best described as the _________ image.
- What layer of an intensifying screen is responsible for emitting light when energized by x-rays?
- Which of the following is most responsible for altering radiographic contrast?
- Which of the following would result in the least reduction in absorbed radiation dose by the patient?
|b.||Increasing kVp from 80 to 81|
|c.||Decreasing mAs from 100 to 95|
|d.||Use of intensifying screen|
- The annual effective dose limit for occupational exposures to x-ray is __________ rem.
- Identify the type of radiographic noise produced in fast imaging systems, which results from too few x-ray photons interacting with the image receiver.
Chapter 02: Specialized Imaging
- The loud tapping noise associated with MRI comes from _____________________.
|a.||energizing the main magnet|
|c.||liquid helium pumps|
|d.||motors driving the couch|
|e.||energizing the gradient magnets|
- Which of the following does not exhibit high signal intensity on T1-weighted MRI images?
- Which of the following MRI techniques would be most helpful in evaluating avascular necrosis?
- Which of the following is not a contraindication to MRI?
|d.||Brain aneurysm clips|
- The acronym SPECT is defined as __________________________________.
|a.||single positron emission computed tomography|
|b.||single-photon emission computed tomography|
- Which of the following is the substance of choice in routine radionuclide bone imaging?
- Which of the following examinations most likely delivers the highest radiation dose?
- In radionuclide imaging of bone, a “hot spot” relates to __________.
- Which of the following imaging modalities measures attenuation values of x-rays with the “Hounsfield unit”?
- An injection into the subarachnoid space is a key procedure of _____________________.
|e.||radionuclide bone scan|
- Which examination would be least likely to display a disc lesion?
|a.||Plain film radiography|
- Which of the following represents the most appropriate examination to quantify bone mineral content?
- In positron emission tomography (PET), the annihilation episode between an electron and a positron generates which of the following?
|a.||Two x-ray photons|
|b.||Two gamma photons|
|c.||Four x-ray photons|
|d.||Four gamma photons|
- What type of magnet is used to construct “open MRI” units?
- Using DEXA, which T-score correlates to osteoporosis?
- In MRI technology, according to the Larmor equation, the frequency of precession of the hydrogen magnetic dipoles has a direct linear relationship with which factor?
|a.||Size of the patient|
|b.||Strength of the external magnetic field|
|c.||Area of examination|
|d.||Hydration of the patient|
|e.||Location of examination (e.g., lumbar spine vs. wrist)|
- Which of the following diagnostic imaging modalities does not use ionizing radiation in the process of obtaining an image?
- Which of the following types of magnets used in MRI units is able to induce the strongest magnetic field and highest signal-to-noise ratio?
- Concentration of which element in the patient is most important in generating magnetic resonance images?
- Which of the following tissues images dark, or “low signal intensity,” on both T1- and T2-weighted pulse sequencing?
- What is the average Hounsfield unit measure for tissue density of bone?
- Chest radiographic examination of a 57-year-old male patient with a 27-pack-year history of smoking reveals a 1.5 cm nodule, without clear evidence of intrinsic calcification, within the right lung parenchyma. Which diagnostic imaging modality would provide the most accurate characterization in follow-up?
|c.||Apical lordotic radiograph|
- For which of the following diagnoses would evaluation with radionuclide scintigraphy be inappropriate?
|b.||Reflex sympathetic dystrophy|
|c.||Metastatic bone disease|
- Contrast injection into the center of an intervertebral disc is a component of which specialized imaging modality?
- Which in the following is NOT an advantage of digital x-ray imaging over conventional radiographic film-based images?
|a.||Potential increase in patient x-ray dose|
|b.||Ability to share images across computer platforms|
|c.||Wider exposure latitude than radiographic film|
|d.||Correction of underexposure or overexposure within limits|
- Which diagnostic imaging modality is most appropriate in assessment of a patient with acute onset low back pain, with pain radiating to the right lower extremity to the great toe?
- Which diagnostic imaging modality is the most appropriate immediate follow-up in a patient with recent head trauma and clinical concern for subdural hemorrhage?
- Which of the following diagnostic imaging modalities has the ability to evaluate cellular and tissue metabolic activity without the use of ionizing radiation?
- What is the increased risk of fracture in a patient with a T-score of -2 as compared to a normal 40-year-old individual?
- Which diagnostic imaging modality would be most appropriate in further assessment of a patient with metatarsal pain, history of recent participation in marathon training, and normal radiographic examination of the foot?
- Flow phase, blood pool scan, and static bone scan are all phases of which diagnostic imaging modality?
- Which diagnostic imaging modality is the procedure of choice in evaluation for cervical spine fracture?
|a.||Conventional radiography with flexion and extension views|
|b.||Conventional radiography with flexion, extension, right and left oblique, and open-mouth views|
|d.||Single positron emission CT|
- A 56-year-old male patient presents with new onset low back pain radiating to the right lower extremity past the knee, and a surgical history of laminectomy at L4-L5. Which contrast agent is likely to be injected with MRI to help differentiate between recurrent disc herniation and scar formation?
- Which of the following is consistent with the appearance of a disc herniation on myelography?
|a.||Widening of the intervertebral disc|
|b.||Attenuation of the nerve root|
|c.||Angular indentation on the lateral thecal sac|
|d.||Filling of the nerve root sleeve with contrast|
- A 63-year-old female patient slips on ice carrying groceries into her home, falls onto her right outstretched hand, and has immediate onset of right wrist pain and swelling. Which diagnostic imaging modality is the procedure of choice in initial follow-up?
- A 62-year-old male patient presents with immediate onset of dyspnea. Which diagnostic imaging modality would be most helpful in excluding pulmonary embolism?
|d.||Inspiration and expiration radiographs|
- The average length of an MRI examination can vary from __________ minutes.
- Which of the following is the most common concern for patients undergoing MRI examination?
|a.||Noise of the MRI unit|
|b.||Length of the examination|
- Use of gadolinium as a contrast agent in MRI examinations is associated with complications in patients who have poor __________ function.
- Which of the following diagnoses is an indication for direct MRI arthrography?
|a.||Hip labral tear|
|b.||Intervertebral disc herniation|
|c.||Anterior cruciate ligament tear|