ARDMS SPI - Mock Exam 2022 Questions and Answers

ARDMS SPI - Mock Exam 2022 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 If a 7 MHz wave is transmitted through the media listed below, the shortest wavelength will be seen in the wave moving through ___________ Correct Ans ~ air - Speed of sound is slowest in air Which system component is not needed when an LCD monitor is used? Correct Ans ~ digital to analog converter LCD monitors accept the digital signal and no not need this compenent Which of the following is a limitation of power Doppler? Correct Ans ~ Slower frame rates than color Doppler What part of the ultrasound system is responsible for changing the element function back and forth from transmit to receive Correct Ans ~ beam former A calorimeter is used to measure the: Correct Ans ~ Power of the beam Blood flow that varies with respiration is described as: Correct Ans ~ Phasic Which statement correctly describes reflection? Correct Ans ~ The greater the difference in acoustic impedance of the two media, the greater the amount of reflection at their interface Steering the color Doppler sample box will cause changes in the: Correct Ans ~ Doppler shift and angle of insonation How do you adjust your technique to reduce or eliminate cross talk on a Doppler tracing? Correct Ans ~ Turn down Doppler gain A larger bandwidth leads to __________________ Correct Ans ~ Improved axial resolution The shorter the pulse, the larger the bandwidth of frequencies present Refraction will cause improper ____________ positioning of echoes on the image Correct Ans ~ lateral Harmonic frequencies are generated: Correct Ans ~ as the sound wave travels through the medium While scanning an obese patient, you apply color Doppler to the aorta. When you adjust the placement of the box, there is a delay between your adjustment and the box moving on the image. How can you correct this? Correct Ans ~ Activate write magnification over the area of interest While scanning, you decide to increase the image contrast. What console control will be adjusted Correct Ans ~ Increase rejection