ARDMS SPI STUDY GUIDE|DETAILED QUESTIONS WITH 100% ACCURATE ANSWERS|NEWEST 2025|ALREADY GRADED A | GET A PASS ON YOUR FIRST TRIAL

In soft tissue, if the frequency of a wave is increased the Propagation Speed (PS) will... - CORRECT ANSWERS️️Remain the Same because stiffness and density affect Propagation Speed. What is the audible range? - CORRECT ANSWERS️️20-20,000Hz 20,000Hz=Ultrasound Frequency is measured in - CORRECT ANSWERS️️Hertz (Hz) is Cycles per Second Not affected by sonographer Increase Frequency; Decrease Depth A period is the length of time it takes for - CORRECT ANSWERS️️one complete wavelength to pass a fixed point PRP is determined by - CORRECT ANSWERS️️Transmit time and receive time. Period is measured in - CORRECT ANSWERS️️Time (μs) When the sonographer changes the imaging depth what parameters are changed? - CORRECT ANSWERS️️PRP, PRF, Duty Factor What is duty factor? - CORRECT ANSWERS️️The 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 ANSWERS️️1.54 mm/μs (1540 m/sec) Unit of measurement for Pulse Duration, Duty Factor, PRP, and Period - CORRECT ANSWERS️️Time, (μs) Pulse duration is determined by - CORRECT ANSWERS️️Sound Source Only Pulse Duration is controlled by - CORRECT ANSWERS️️the ultrasound system and transducer Pulse Duration Formula - CORRECT ANSWERS️️pulse duration (μs) = # cycles in pulse/frequency(MHz) PD= Number of cycles in Pulse/ Frequency(Hz) Spatial Pulse Length (SPL) (measurement) - CORRECT ANSWERS️️The distance that a pulse occupies in space from the start to the end of a pulse. (mm) Typical values for spatial pulse length in soft tissue. - CORRECT ANSWERS️️0.1 to 1.0 mm Spatial pulse length is determined by - CORRECT ANSWERS️️sound source and medium Spatial Pulse Length is directly proportional to - CORRECT ANSWERS️️the Number of Cycles in the Pulse and the Wavelength (Directly Proportional means that increased SPL will increase both the number of cycles in the pulse and the wavelength if increased). Spatial pulse length is inversely proportional to - CORRECT ANSWERS️️Frequency (MHz) (Inversely Proportional means that increased SPL will lower frequency. This is because axial resolution is better with lower frequency) Pulse Duration (PD) - CORRECT ANSWERS️️The actual time from the start of a pulse to the end of that pulse; a single transmit, talking, or "on" time. Time the pulse is on typically measured in (ms). Pulse Length - CORRECT ANSWERS️️The distance of the pulse start to end or the duration or length of a single pulse Pulse Length is typically measured in (mm). the ability of an object to resist compression and relates to the hardness of a medium? - CORRECT ANSWERS️️Stiffness. Think: ↑ Stiffness ↑ Speed ↓ Density ↑ Speed An increase in pulse repetition frequency would lead to: - CORRECT ANSWERS️️Increasing pulse repetition frequency, increases duty factor. ↑ PRF ↑ Duty Factor