SPI Practice (ARDMS A & B).docx

to which acoustic variable is penetration depth inversely related? A.frequency B.wavelength C.period D.propagation speed - correct answer A 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 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 - correct answer A 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 - correct answer B 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 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 In this image, which target group is used to evaluate dead zone? - correct answer A 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 when using a 5MHZ transducer, in which tissue is the ultrasound wavelength shortest? A.fat B.blood C.bone D.muscle - correct answer A 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 - correct answer D what does coded excitation improve in addition to penetration? A.lateral resolution B.signal-to-noise ratio C.frame rate D.dynamic range - correct answer B 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 which doppler angle to flow results in the greatest absolute doppler shift? A.0 degrees B.15 degrees C.45 degrees D.60 degrees - correct answer A 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 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 - correct answer C 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 what is an advantage of using pulsed-wave doppler versus continuous wave doppler? A.allows measurement of higher velocities B.increases range ambigutiy C.reduces the potential for aliasing D.provides depth specificity - correct answer D What is demonstrated in this image produced by a linear array transducer placed on a uniform tissue-mimicking phantom? A. Time gain compensation not set properly. B. System has low