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ARDMS SPI 500 QUESTIONS AND ANSWERS
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ARDMS SPI 500 QUESTIONS AND ANSWERS
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ARDMS SPI 500 QUESTIONS AND ANSWERSA sound wave is - answer- mechanical, longitudinal
A compression area of a sound wave is - answer- high pressure, high density
A rarefaction area of a sound wave is - answer- low pressure, low density
Which is considered an acoustic variable - answer- pressure
Which is a unit for pressure - answer- N/m2
Which is a unit for density - answer- lbs/cm3
Which wave propagates in a medium - answer- sound
The range for ultrasound is - answer- greater than 20KHz
____ is the number of wave cycles per second - answer- frequency
One kilohertz is equal to - answer- 1,000 cycles per second
One megahertz is equal to - answer- 1,000,000 cycles per second
The useful frequency range for clinical imaging ultrasound is - answer- 2 MHz to 10
MHz
Frequency is determined by the - answer- source
Frequency affects all of the following, except: wavelength, resolution, penetration,
impedance - answer- impedance
The times per cycle is - answer- period
The period for a 5 MHz probe is - answer- 0.2usec
If frequency increases, period will - answer- decreases
Period is determined by the - answer- source
Period multiplied by the number of cycles in a pulse equals - answer- pulse duration
The distance between cyclical peaks is - answer- wavelength
The symbol for wavelength is - answer- lambda
, The wavelength of a 5 MHz probe in soft tissue is - answer- 0.3 mm
As frequency increases, wavelength (assume same medium) - answer- decreases
Wavelength is determined by the - answer- source and medium
As wavelength decreases - answer- resolution improves
The rate at which a sound vibration propagates through a medium is called all of the
following, except: sound speed, prop speed, speed of sound, velocity - answer- velocity
The units for propagation speed include all the following, except: km/sec, mph, msec,
mm/sec - answer- msec
The average speed of sound in soft tissue is - answer- 1540 m/sec
Arrange the following in increasing order of sound speed in soft tissue - answer- air, fat,
muscle, soft tissue, muscle, bone
The prop speed of sound of the ceramic lead zirconate titanate (PZT) is approx -
answer- 4000 m/sec
speed of sound is determined by - answer- medium
The peak variation minus the mean variation is - answer- amplitude
All of the following are possible units for amplitude, except: degrees, decibels, Pascal,
watts - answer- degrees
The maximum variation of an acoustic variable is 60. The mean value is 45. The
maximum value is 30. The amplitude is - answer- 15
Amplitude is determined by - answer- source
Which ultrasound machine control will affect amplitude - answer- output power
As sound propagates through a medium, amplitude - answer- decreases
The total energy transferred is - answer- power
Power is determined by - answer- source
The amplitude of a wave is 4, power is - answer- 8
Power may be affected by which gain control - answer- transmit
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