ARDMS SPI STUDY GUIDE (100% Verified answers)

In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... correct answers Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? correct answers 20-20,000Hz 20,000Hz=Ultrasound Frequency is measured in correct answers 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 answers one complete wavelength to pass a fixed point PRP is determined by correct answers Transmit time and receive time. Period is measured in correct answers Time (μs) When the sonographer changes the imaging depth what parameters are changed? correct answers PRP, PRF, Duty Factor What is duty factor? correct answers 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 answers 1.54 mm/μs (1540 m/sec) Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period correct answers Time, (μs) Pulse duration is determined by correct answers Sound Source Only Pulse Duration is controlled by correct answers the ultrasound system and transducer Pulse Duration Formula correct answers pulse duration (μs) = # cycles in pulse/frequency(MHz) PD= Number of cycles in Pulse/ Frequency(Hz) Spatial Pulse Length (SPL) (measurement) correct answers The distance that a pulse occupies in space from the start to the end of a pulse.