SPI MOCK EXAM QUESTIONS AND ANSWERS GRADED A

SPI MOCK EXAM QUESTIONS AND ANSWERS GRADED A When the ELASTICITY of a medium is HIGH, the _____ is HIGH - stiffness - prop. speed - compressibility - reflectivity ✔✔compressibility What term describes the # of cyc ...

SPI MOCK EXAM QUESTIONS AND ANSWERS GRADED A When the ELASTICITY of a medium is HIGH, the _____ is HIGH - stiffness - prop. speed - compressibility - reflectivity ✔✔compressibility What term describes the # of cycles that an acoustic variable completes in a second? - period - freq. - PRP - variable rate ✔✔freq. What happens to venous flow return to the HEART when a person INHALES? ✔✔increases What establishes the freq. of an US wave? - transducer - medium through which sound travels - both - neither ✔✔transducer Which of the following tasks is NOT performed by the receiver of an US sx? - rectification - smoothing - compression - degaussing ✔✔degaussing Which of the following is NOT a potential mechanism for the production of bioeffects from US exposure to the body? - temp. elevation - fractionation - cavitation - vibration ✔✔fractionation Which of the following terms does NOT belong with the others? - increased DOV - increased DF - increased PRP - decreased PRF ✔✔increased DF Which of the following is NOT one of the physical processes that contributes to attenuation of US waves passing through soft tissue? - reflection - redirection of sound in many directions - focusing - conversion of acoustic energy to heat ✔✔focusing According to AIUM, at which IN SITU tissue temp. is there danger to a fetus? - 100 C - 98.6 F - 1 F over normal temp. - 41 C ✔✔41 C 2 sound pulses travel through the SAME medium. One wave's freq. is 2 MHz and the other 10 MHz. Which pulse has a LOWER PROP. SPEED? - 10 MHz pulse - 2 MHz pulse - neither - cannot be determined ✔✔neither What is the SMALLEST part of a DIGITAL picture called? - bit - byte - pixel - fractal ✔✔pixel SPL is _________ related to PD ✔✔directly AXIAL resolution is determined by - mult. reflections - beam width - attenuation - SPL ✔✔SPL What happens to the DIAPHRAGM when a person INHALES? - ascends into the thorax - descends into the abd ✔✔descends into the abd 2 sound pulses travel through the SAME medium. One wave's freq. is 2 MHz and the other 10 MHz. Which pulse has a LONGER SPL? - 2 MHz - 10 MHz - neither - cannot be determined ✔✔cannot be determined A TRAPEZOIDAL image shape is produced which is flat at the top and becomes progressively wider at increasing depths. Which transducer produces this? - mechanical - annular phased array - linear phased array - vector array ✔✔vector array US is defined as a sound with a freq. of ______________ - > 20,000 kHz - < 1 kHz - - > 10 MHz - > 0.02 MHz ✔✔> 0.02 MHz What is the best estimate of the distance that sound can travel in soft tissue in one second? - 1 yard - 100 yards - 1 mile - 10 miles ✔✔1 mile Which is considered the MOST IMPORTANT for the sonographer in regards to bioeffects? - PRF - freq. - duration of the study - imaging mode ✔✔duration of the study An US pulse has a PRP of 1.2 msec, a SPL of 2.0 mm, and a WL of 0.4 mm. What is the AXIAL resolution of the sx? - 2.0 mm - 1.0 mm - 0.4 mm - 1.8 mm ✔✔1.0 mm 2 sound pulses travel through the SAME medium. One wave's freq. is 2 MHz and the other 10 MHz. Which sound wave has a LONGER PERIOD? - 10 MHz pulse - 2 MHz pulse - neither - cannot be determined ✔✔2 MHz pulse A sound propagates through a medium, the total power in the wave decreases. What is the entire process called? - absorption - scattering - attenuation - reflection ✔✔attenuation Which artifact is created by sound moving through a medium with a propagation speed less than soft tissue? - vertical misregistration - horizontal misregistration - lateral resolution - ring down ✔✔vertical misregistration What best describes SPL? - freq. x wl - PRF x wl - wl x # cycles in a pulse - DF x wl ✔✔wl x # cycles in a pulse Which 2 controls determines the sx's temporal resolution? - frame rate & sector size - focal zones & sector depth - prop. speed & frame rate - DOV & pulses per image ✔✔DOV & pulses per image