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EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
What is dynamic aperture? A.aperture that varies with transmit frequency B.aperture that decreases as a function of time C.aperture that increases with increasing focal length D.aperture that changes as a function of frame rate. C - Answer A - Answer to which acoustic variable is penetration depth inversely related? A.frequency B.wavelength C.period D.propagation speed B - Answer which imaging mode requires a broadband transducer? A.continuous wave doppler B.Pulsed wave doppler C.color flow imaging D.harmonic imaging B - Answer what is the doppler shift frequency? A.recieved ultrasound frequency multiplied by the transmitted ultrasound frequency B.difference between the transmitted ultrasound frequency and the received ultrasound frequency C.sum of the transmitted and received ultrasound frequencies D.ratio of the transmitted ultrasound frequency to the received ultrasound frequency A - Answer what is the potential effect of increasing the pulse repetition frequency(PRF)? A.Depth ambiguity B.Decreased frame rate C.Poor spatial resolution D.Decreased penetration
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
B - Answer what is an advantage of using pulsed wave doppler compared to continuous wave doppler? A. higher echo sensitivity B.ability to select sample depth C.decreased display of aliasing D.improved temporal resolution D - Answer what affects the beam width in the near field? A.Pulse repetition frequency B. Pulse duration C.Frame rate D.Transducer aperture
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
C.bone D.muscle
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
D - Answer which term describes the averaging together of scan lines from multiple angles to create one image? A. harmonic imaging B. realtime three dimensional imaging C.elastography D.spatial compounding A - Answer which variable can cause an acoustic shadow artifact? A.small acoustic impedance mismatch B.refraction C.perpendicular incidence D.low attenuation B - Answer what does coded excitation improve in addition to penetration? A.lateral resolution B.signal-to-noise ratio C.frame rate D.dynamic range A - Answer how is lateral resolution determined for a pulsed-echo system using a tissue-mimicking test object? A.by observing spaces between reflectors perpendicular to the beam B.by observing spaces between reflectors along the beam path C.by observing position of deepest visible reflector along the beam path D.by observing position of deepest visible reflector perpendicular to the beam path A - Answer which variable caused the color change from blue to red of the vessel in this image? A.change in vessel direction B.color scale set to low C.turbulent flow D.severe stenosis C - Answer which artifact is indicated by the arrows in this image? A.shadow produced by the diaphragm B.acoustic enhancement C.comet tail D.mirror image
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
A - Answer which doppler angle to flow results in the greatest absolute doppler shift? A.0 degrees B.15 degrees C.45 degrees D.60 degrees A - Answer what term describes blood flow changes in response to respiration? A.phasic B.parabolic C.spontaneous D.pulsatile B - Answer an increase in which parameter will improve the accuracy of velocity measurements with autocorrelation? A.color field of view B.packet size C.wall filtering D.transmitted frequency C - Answer which harmonic imaging, how does echo frequency relate to transmitted frequency? A.half the transmitted frequency B.equal to the transmitted frequency C.twice the transmitted frequency D.four times the transmitted frequency B - Answer Which change would minimize the artifact observed in this image, assuming the pulse repetition frequency is at its maximum limit? A.adjust the sweep speed B.adjust the baseline C.increasing dynamic range D.increasing the transmitted frequency D - Answer which parameter is most likely to affect spatial resolution? A.dynamic range B.beam width C.system sensitivity D.depth of visualization
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
B - Answer which imaging modality can provide the most accurate measurement of tumor volume? A.color doppler B.B- mode
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
A. axial resolution B. lateral resolution C. horizontal distance resignation D. sensitivity
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
B - Answer If the ultrasound machine comes in contact with a patients body fluids, what should be done? A. remove the machine from use for the day B. use an approved disinfectant solution to clean it C. call the manufacturer to see what they would do B - Answer Which parameter is most related to cavitation tissue? A. energy B. pressure C. duty factor D. pulse repetition frequency B - Answer Which interface will cause the maximum reflection of the incident sound beam? A. fat/muscle B. soft tissue/bone C. fat/soft tissue D. soft tissue/lung D - Answer Acoustic enhancement occurs distal to what? A. calcifications B. near field interface C. highly reflecting structure D. weakly attenuating structure D - Answer As the pressure amplitude of ultrasound doubles, what happens to the wavelength? A. quadruples B. doubles C. halves D. unchanged B - Answer What is the period of a 5 MHz ultrasound wave? A. 0.02 ms B. 0.2 ms C. .5mc D. 5ms B - Answer What limits diagnostic application at higher frequencies? A. noise B. tissue penetration C. contrast resolution
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
A - Answer What is the function of a lens on a transducer? A. focus the beam B. increase the bandwidth C. shorten the pulse length D. provide damping D - Answer What would improve axial resolution? A. increase the pulse repetition frequency B. reduce the receiver gain C. change the gray scale map D. increase the transducer frequency D - Answer What is true of the far field? A. sound beam converges B. intensity is highest C. lateral resolution is best D. sound beam diverges A - Answer what improves lateral resolution? A. decreasing the beam width B. increasing the pulse repetition frequency C. decreasing transmitted frequency D. decreasing the width of the field of view B - Answer Which statement is true for a linear phased array transducer? A. line density increases with depth B. elements are all fired nearly simultaneously C. elements are fired in successive groups D. all scan lines are perpendicular to the face of the transducer D - Answer Which artifact is commonly seen within cystic masses due to the finite dimensions of the ultrasound beam? A. duplication B. mirror image C. reverberation D. slice thickness C - Answer Which technique utilizes frequency modulation of the transmitted pulse to improve signal to noise ratio? A. apodization B. panoramic imaging C. coded excitation
EXAM 50 QUESTIONS AND CORRECT
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D. spatial compounding
EXAM 50 QUESTIONS AND CORRECT
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b) Seek approval from supervisor c) Verbally repeat the request back to the referrer to verify correctness d) Document two forms of ID of the patient
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
A - Answer which setting of an ultrasound system gives the sonographer the ability to display both strong and week echoes? a) Dynamic range b) Resolution c) Range calibration d) Sensitivity B - Answer what is a benefit of using contrast agents? a) Output power can be increased after contrast administration to improve visualization b) Increased amplitude of the returning doppler signals c) Harmonic signals produced by contrast agents are weaker than those produced by tissue d) Frame rate is improved when interrogating contrast with power doppler A - Answer a sound wave propagates fastest through which substance? a) Bone b) Muscle c) Fat d) Gas C - Answer when the focal point in a B-mode image is electronically changed, which type of focusing is in use? a) Lens b) Mechanical c) Dynamic d) Curved crystal C - Answer when a fluid is flowing at a slow and constant rate within a long tube having a uniform diameter, what is the nature of the flow? a) Disturbed b) Turbulent c) Laminar d) Pulsatile C - Answer what causes range ambiguity artifacts? a) Receiver overload b) Pulser overload c) PRF too high d) PRF too low
EXAM 50 QUESTIONS AND CORRECT
ANSWERS A GRADE
a) 1.54 usec b) 6.5 usec c) 13 usec d) 26 usec B - Answer which variable decreases when the number of acoustic lines per frame is increased without changing its maximum depth? a) SPL b) Frame rate c) PRF d) Receiver dynamic range C - Answer frequency compounding improves image quality by doing what? a) Increasing frame rate b) Improving dynamic range c) Reducing speckle d) Reducing grading lobes A - Answer what is the most common cause of localized vertical nonuniformity in a real-time B-mode image? a) Improper TGC b) Defective transducer elements c) Faulty preamplifier d) Malfunctioning scan converter C - Answer what is the cause of the black region in the center of the vessel seen in this image? a) Aliasing b) Turbulence c) Incident angle d) Lack of blood flow at that location C - Answer what is increased if the pulse duration is decreased? a) Bandwidth b) Line Density c) Frame Rate d) Duty Factor C - Answer what is the Nyquist limit if a pulsed wave Doppler instrument has a pulse repetition frequency of 16 kHz? a) 32 kHz b) 10 kHz
EXAM 50 QUESTIONS AND CORRECT
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c) 8 kHz d) 5 kHz
