SPI ARDMS EXAM QUESTIONS AND ANSWERS/STUDY GUIDE LATEST UPDATE

What type of wave is sound? Correct Ans ~ mechanical and longitudinal The frequency ranges for ultrasound are: Correct Ans ~ >20 kHz The speed of sound in soft tissue is: Correct Ans ~ 1540 m/s which of the following transducers fires the elements in groups? A. Linear sequenced array B. Phased array C. Continuous-wave transducer D. Single-element transducer Correct Ans ~ A Enhancement is caused by** Correct Ans ~ weakly attenuating structures wavelength in material having a propagation speed of 1.5mm/µs w/transducer frequency of 5.0 MHz is: ** Correct Ans ~ .3mm 1.5mm/µs / 5MHz =.3mm An ultrasound transducer converts ** Correct Ans ~ electrical energy into mechanical energy Media lowest attenuation to highest: ** Correct Ans ~ Fat, Muscle, Bone, Air Media propagation speed from lowest to highest: ** Correct Ans ~ Air, Fat, Muscle, Bone If the frequency doubles, what happens to the wavelength? ** Correct Ans ~ Decreases by 1/2 (inversely related) What happens to intensity if amplitude of signal is 1/2? ** Correct Ans ~ Quartered % of time that sound is on Correct Ans ~ Duty Factor