ARDMS SPI 500 QUESTIONS AND
APPROVED ANSWERS.
A 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
APPROVED ANSWERS.
A 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
