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SPI Exam Review All Questions & Answers (Graded A+).

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SPI Exam Review All Questions & Answers (Graded A+).SPI Exam Review All Questions & Answers (Graded A+).SPI Exam Review All Questions & Answers (Graded A+).SPI Exam Review All Questions & Answers (Graded A+).SPI Exam Review All Questions & Answers (Graded A+).SPI Exam Review All Questions & Answers...

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  • December 21, 2024
  • 40
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • ARDMS SPI
  • ARDMS SPI
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Wisdoms
SPI Exam Review All Questions &
Answers (Graded A+)


ultrasound imaging type in which pulses are reflected and used to produce a display -
j. j. j. j. j. j. j. j. j. j. j. j. j. j. j.



(correct answer) -pulsed wave j. j. j.




brightness of the dots on image - (correct answer) -amplitude j. j. j. j. j. j. j. j. j.




round-trip travel time per cm in soft tissue - (correct answer) -13 microseconds
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A line produced on a display that represents ultrasonic echoes returning from the body. A
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sonographic image is composed of many such lines. - (correct answer) -scan line
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Type of image presented in a rectangular format.
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- Each pulse travels in same direction
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- Different starting point for each pulse
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- Yields series of parallel scan lines - (correct answer) -linear
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Type of image presented in a pie-slice or wedge shaped format.
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- Each pulse originates from the same starting point
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- Subsequent pulses go out in different directions from previous ones - (correct answer) -
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sector

Frequency change tracking caused by motion of reflectors towards or away from the
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transducer
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- Used extensively in vascular & cardiac ultrasound - (correct answer) -Doppler Shift
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The presentation of two-dimensional, real-time Doppler-shift information superimposed
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on a real-time, gray-scale, anatomic, cross-sectional image. Flow directions toward and
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away from the transducer (i.e., positive & negative Doppler shifts) are presented as
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different colors on the display. - (correct answer) -Color Doppler
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Unit of power or intensity ratio; also a unit of amplitude ratio - (correct answer) -decibel
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doubled intensity in dB - (correct answer) -3 dB j. j. j. j. j. j. j. j.




mathematical numerical system in which the number of 10s that are multiplied together in j. j. j. j. j. j. j. j. j. j. j. j. j.



order to equal the number
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,Log₁₀ of 100 = 10 × 10 = 100 or 10² j. j. j. j. j. j. j. j. j. j.




Log₁₀ of 100 = 2 - (correct answer) -logarithm j. j. j. j. j. j. j. j.




What transports energy, not matter? - (correct answer) -wave
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Type of sound wave that requires a medium to travel in and, therefore, cannot propagate
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in a vacuum. - (correct answer) -mechanical
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Regions of high density and pressure in a compressional wave. - (correct answer) - j. j. j. j. j. j. j. j. j. j. j. j. j.



compression

Region of low density and pressure in a compressional wave. - (correct answer) -
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rarefaction

What are the 3 acoustic variables? List them alphabetically. - (correct answer) -density,
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distance, pressure
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Concentration of force j. j.



- Units: pascals (Pa), lbs/in², atmospheres - (correct answer) -Pressure
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Concentration of mass j. j.



- Units: kilo/cm³ - (correct answer) -Density
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cycles per second - (correct answer) -frequency j. j. j. j. j. j.




unit of frequency, one cycle per second - (correct answer) -hertz
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20 → 20,000 Hz (20 kHz) - (correct answer) -audible sound
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2 to 15 MHz - (correct answer) -What is the useful diagnostic frequency range for
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ultrasound in humans?
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time per cycle j. j.



- Equation: If T = period in microseconds (µs) and ƒ = frequency in megahertz (MHz), then
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T (µs) = 1/ƒ (Mhz)
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- Reciprocal of frequency equation - (correct answer) -period
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As frequency increases, period _________. - (correct answer) -decreases
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length of space over which a cycle occurs j. j. j. j. j. j. j.



- Abbreviated: λ (lambda) - (correct answer) -wavelength
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0.1 → 0.8 mm - (correct answer) -What is the typical ultrasound wavelength range?
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speed with which a wave moves through a medium j. j. j. j. j. j. j. j.

,Units: mm/μs, m/s j. j.



Abbreviation: c - (correct answer) -propagation speed j. j. j. j. j. j.




What two properties of a medium affect its propagation speed? - (correct answer) -density,
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stiffness
j.




1.54 mm/μs OR 1540 m/s - (correct answer) -speed of sound in soft tissue
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Order the following by propagation speed from slowest to fastest:
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bone, fat, air, muscle, liver - (correct answer) -air, fat, liver, muscle, bone
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the resistance that sound encounters in traveling through a medium - (correct answer) -
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impedance

unit of impedance - (correct answer) -Rayl
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equation that illustrates relationship between round-trip pulse travel time, propagation
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speed, and distance to the reflector - (correct answer) -range equation
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(PW) the number of pulses that occur in 1 sec; sometimes called pulse repetition rate -
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(correct answer) -pulse repetition frequency j. j. j. j.




When distance (depth) increases, PRF ---------. - (correct answer) -decreases
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What must the sonographer change to alter the PRF? - (correct answer) -depth
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Interval of time from the beginning of one pulse to the beginning of the next.
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** Includes pulse time & listening time **
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Units: Seconds (s) - (correct answer) -pulse repetition period
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PRP increases because the system must listen longer for pulse to return from longer
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distance. - (correct answer) -What happens to PRP when distance (depth) increases:
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Interval of time from beginning to end of a pulse
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Units: µs (microseconds) - (correct answer) -pulse duration
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0.5 → 3.0 µs
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** NOT controlled by sonographer - (correct answer) -What is the typical range for pulse
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duration in ultrasound?
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Percent time that ultrasound is transmitting - (correct answer) -duty factor
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What happens to duty factor when imaging depth increases? - (correct answer) -
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decreases

What happens to duty factor when PRF increases? - (correct answer) -increases
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, What happens to duty factor when PRP increases? - (correct answer) -decreases
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What happens to duty factor when pulse duration increases? - (correct answer) -increases
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Can duty factor be changed by sonographer? - (correct answer) -yes
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length of space over which a pulse occurs
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Units: mm - (correct answer) -spatial pulse length
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Can SPL be controlled by the sonographer? - (correct answer) -no
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maximum variation of an acoustic variable or voltage - (correct answer) -amplitude
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sonographer can change by adjusting power or gain - (correct answer) -amplitude
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What determines period: source, sonographer, or medium? - (correct answer) -source
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What determines frequency: medium, sonographer or source? - (correct answer) -source
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What determines amplitude: medium, sonographer or source? - (correct answer) -source,
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sonographer
j.




What determines power: medium, sonographer or source? - (correct answer) -source,
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sonographer
j.




What determines intensity: medium, sonographer or source? - (correct answer) -source,
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sonographer
j.




What determines wavelength: medium, sonographer or source? - (correct answer) -
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medium and source j. j.




What determines speed: medium, sonographer or source? - (correct answer) -medium
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rate at which work is done; rate at which energy is transferred
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Units: W, mW (watts and milliwatts) - (correct answer) -power
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The concentration of power in an area
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Units: mW/cm² - (correct answer) -intensity
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1. SPTP
j.



2. SPPA
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3. SPTA
j. j.



4. SATP
j.



5. SAPA
j.



6. SATA
j.

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