ARDMS SPI Practice Test A.docx

Which parameter is most likely to affect spatial resolution?A.dynamic range B.beam width C.system sensitivity D.depth of visualization - correct answer D.depth of visualization When using a 5MHZ transducer, in which tissue is the ultrasound wavelength shortest? A.fat B.blood C.bone D.muscle - correct answer A.fat What affects the beam width in the near field? A.Pulse repetition frequency B.Pulse duration C.Frame rate D.Transducer aperture - correct answer D.Transducer aperture 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 - correct answer A.change in vessel direction Which imaging mode requires a broadband transducer?A.continuous wave doppler B.Pulsed wave doppler C.color flow imaging D.harmonic imaging - correct answer B.Pulsed wave doppler Which factor limits image frame rate? A.transducer operating frequency B.Sample volume size C.Speed of sound in tissue D.Spatial pulse length - correct answer C.Speed of sound in tissue Which imaging modality can provide the most accurate measurement of tumor volume? A.color doppler B.B-mode C.A-mode D.M-mode - correct answer B.B-mode 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 - correct answer B.adjust the baseline 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 - correct answer A.by observing spaces between reflectors perpendicular to the beam 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 - correct answer C.aperture that increases with increasing focal length What is the advantage of using pulsed-wave doppler versus continuous-wave doppler? A.allows measurement of higher velocities B.increases range ambiguity C.reduces the potential for aliasing D.provides depth specificity - correct answer D.provides depth specificity 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 - correct answer B.difference between the transmitted ultrasound frequency and the received ultrasound frequency Which parameter is target group C evaluating based on the image? A.dead zone B.dynamic range C.axial resolution D.Horizontal distance accuracy - correct answer D.Horizontal distance accuracy 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 - correct answer B.packet size 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 - correct answer C.comet tail Which control improves the effects of attenuation? A.dynamic range B.pulse inversion C.multiple focal zones D.time gain compensation - correct answer D.time gain compensation What term describes blood flow changes in response to respiration? A.phasic B.parabolic C.spontaneous D.pulsatile - correct answer A.phasic