ARDMS SPI - Mock Exam 2023 Questions And Answers

Materials used for the matching layer of a transducer must have an impedance between impedance levels of the ______________ Correct Ans ~ skin and PE element Which of the following is an abnormality that would lead to an imcrease in the Reynolds number? Correct Ans ~ stenosis of the vessel If a 3.5 MHz wave is transmitted through the media listed below, the longest wavelength will be seen in the wave moving through ____________ Correct Ans ~ bone The speed of sound is fastest in bone. Longer wavelengths occur with faster propagation speeds If you are using a transducer with a 100 microsecond pulse repetition perios, a Doppler shift greater than ____________ will lead to aliasing on the display. Correct Ans ~ 5 kHz Which of the following persistence levels should be used to optimize color Doppler imaging of cardiac structures? Correct Ans ~ Low Which of the following artifacts can NOT be corrected by increasing the wall filter setting? Correct Ans ~ aliasing artifact What changes occur to the ultrasound beam when timed pulses are emitted from the edge elements to the center elements of the phased transducer Correct Ans ~ electronic focusing occurs Which of the following correctly describes Power Doppler Correct Ans ~ Color display is not angle dependent Which of the following lists the normal range of intensities used in diagnostic Doppler US? Correct Ans ~ 0.2-400 mW/cm - Average range of diagnostic intensities for all types of US imaging: 2 - 500 mW/cm^2 - 2D imaging intensities are less than w/ Doppler - Average range of Doppler intensities: 0.2-400 mW/cm^2 - 2D imaging averave range 0.1-300 mW/cm^2 Snell's law describes what acoustic principle? Correct Ans ~ refraction