ARDMS SPI Study Guide Question And Answers 2023.
ARDMS SPI Study Guide Question And Answers 2023. In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... Correct Answer: Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? Correct Answer: 20-20,000Hz 20,000Hz=Ultrasound Frequency is measured in Correct Answer: Hertz (Hz) is Cycles per Second Not affected by sonographer Increase Frequency; Decrease Depth A period is the length of time it takes for Correct Answer: one complete wavelength to pass a fixed point PRP is determined by Correct Answer: Transmit time and receive time. Period is measured in Correct Answer: Time (μs) When the sonographer changes the imaging depth what parameters are changed? Correct Answer: PRP, PRF, Duty Factor What is duty factor? Correct Answer: The percentage or fraction of time that the system is transmitting a pulse (Time Sound is ON or ON-Time). Propagation Speed in SOFT TISSUE Correct Answer: 1.54 mm/μs (1540 m/sec) Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period Correct Answer: Time, (μs) Pulse duration is determined by Correct Answer: Sound Source Only Pulse Duration is controlled by Correct Answer: the ultrasound system and transducer Pulse Duration Formula Correct Answer: pulse duration (μs) = # cycles in pulse/frequency(MHz) PD= Number of cycles in Pulse/ Frequency(Hz) Spatial Pulse Length (SPL) (measurement) Correct Answer: The distance that a pulse occupies in space from the start to the end of a pulse. (mm)
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