SPI MOCK EXAM.docx

When the ELASTICITY of a medium is HIGH, the _____ is HIGH - stiffness - prop. speed - compressibility - reflectivity - correct answer compressibility What term describes the # of cycles that an acoustic variable completes in a second? - period - freq. - PRP - variable rate - correct answer freq. What happens to venous flow return to the HEART when a person INHALES? - correct answer increases What establishes the freq. of an US wave? - transducer - medium through which sound travels - both - neither - correct answer transducer Which of the following tasks is NOT performed by the receiver of an US sx? - rectification - smoothing - compression - degaussing - correct answer 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 - correct answer fractionation Which of the following terms does NOT belong with the others? - increased DOV - increased DF - increased PRP - decreased PRF - correct answer 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 - correct answer 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 - correct answer 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 - correct answer neither What is the SMALLEST part of a DIGITAL picture called? - bit - byte - pixel - fractal - correct answer pixel SPL is _________ related to PD - correct answer directly AXIAL resolution is determined by - mult. reflections - beam width - attenuation - SPL - correct answer SPL What happens to the DIAPHRAGM when a person INHALES? - ascends into the thorax - descends into the abd - correct answer 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 - correct answer 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 - correct answer vector array