Ultrasound Physics - Mock Exam Questions for SPI. | COMPLETE
QUESTIONS WITH 100% RATED CORRECT ANSWERS!! | 2025 LATEST
UPDATED
Attenuation Coefficient - (answers)Attenuation per cm to in soft tissue the attenuation coefficient
is estimated at half the frequency in megahertz or .5 dB per centimeter in megahertz
Impedance equals
Units - (answers)Density X speed
Rayls
13 µs rule - (answers)For every 13 µs reflector is 1 cm deep in the body
The time it takes to complete a cycle. Units? Determined by? Can the sonographer change this? -
(answers)Period. Units of time seconds milliseconds hour. Determined by the sound source. No
sonographer can't change
The number of events that occur in a particular duration units? Determined by? Can the
Sonographer for change this? - (answers)Frequency. Hertz. Determined by sound source. No the
sonographer cannot change this
Ultrasound is a sound wave with a frequency exceeding what? - (answers)20,000 Hz
Audible sound has a frequency of - (answers)20 to 20,000 Hz
And infrasound is a frequency less - (answers)20 Hz
And clinical imaging typical frequencies range from - (answers)1 MHz to 10 MHz
,Frequency affects what two things? - (answers)Penetration and axial resolution
What are the acoustic variables of amplitude? - (answers)Pressure, density, temperature, particle
motion
What are the units of amplitude, what is it determined by, and can the sonographer change this? -
(answers)Units depend on the acoustic variable. Pressure is pounds per square inch,
density,grams per cubic centimeter, &
pascals- temperature degrees and particle motion centimeters inches are units of distance
amplitude can also be expressed in decibels, sound source & YES can be changed by
sonographer
The rate that which work is being performed
Units? - (answers)Power
Watts
If amplitude is tripled the power is increased - (answers)9 times its original value
If amplitude is halved, power is? - (answers)The power is quartered
Concentration of energy in a sound beam? What are the units? - (answers)Intensity. Watts/cm2
Ultrasound intensity ranges from what to what and clinical imaging? - (answers).001-100 W per
centimeter squared
Intensity is directly proportional to - (answers)Power
Intensity is proportional to - (answers)Amplitude squared
If power is doubled intensity - (answers)Doubles
,If amplitude doubles, intensity? - (answers)Increases by four times
If amplitude is quartered then intensity - (answers)Is reduced to 1/16 its original value
The distance or length of a single cycle - (answers)Wavelength
Wavelength is determined by - (answers)Both the source and the medium
Wavelength equals - (answers)Propagation speed /frequency
In soft tissue = 1.54 mm / frequency in megahertz
In soft tissue sound with a frequency of 1 MHz has a wavelength of - (answers)1.54 mm
In soft tissue sound with a frequency of 2 MHz has a wavelength of - (answers).77 mm
Propagation speed is determined by - (answers)Medium only
Average speed of all sound in biological or soft tissue - (answers)1.54 km/s, 154 0 m/s, 1.54 mm
per microsecond
Speed of sound in slowest to fastest order fat, soft tissue, lung, bone - (answers)Lung, fat, soft
tissue, bone
The time from the start of one pulse to the start of the next pulse - (answers)Pulse repetition
period
As imaging depth increases pulse repetition period and pulse repetition frequency -
(answers)Increases
Decreases
, If pulse repetition frequency increases the duty factor - (answers)Increases
If imaging depth increases the duty factor - (answers)Decreases
If pulse duration increases the duty factor - (answers)Increases
Intensity that is important regarding thermal bioeffects - (answers)SPTA
Describes the spread of beam in space - (answers)Beam uniformity coefficient or SP/SA factor
Beam uniformity coefficient units and value - (answers)Unitless. Has a value of one or greater
Rank the intensities in order SPTA, SATA, SPPA, Im, SPTP - (answers)SPTP, Im, SPPA, SPTA,
SATA
If you increase the intensity by 3 dB the final intensity is - (answers)Two times bigger then the
original intensity
Increasing by 10 dB means the final intensity is - (answers)10 times bigger the original intensity
If you increase by six times the intensity is - (answers)Four times bigger than the original
intensity. Because 2×2 is four
If you increase by 9 dB the final intensity is - (answers)Eight times bigger than the original
intensity. Because 2×2 is 4×2 is eight
Attenuationis higher in both bone and lung as compared to - (answers)Soft tissue
QUESTIONS WITH 100% RATED CORRECT ANSWERS!! | 2025 LATEST
UPDATED
Attenuation Coefficient - (answers)Attenuation per cm to in soft tissue the attenuation coefficient
is estimated at half the frequency in megahertz or .5 dB per centimeter in megahertz
Impedance equals
Units - (answers)Density X speed
Rayls
13 µs rule - (answers)For every 13 µs reflector is 1 cm deep in the body
The time it takes to complete a cycle. Units? Determined by? Can the sonographer change this? -
(answers)Period. Units of time seconds milliseconds hour. Determined by the sound source. No
sonographer can't change
The number of events that occur in a particular duration units? Determined by? Can the
Sonographer for change this? - (answers)Frequency. Hertz. Determined by sound source. No the
sonographer cannot change this
Ultrasound is a sound wave with a frequency exceeding what? - (answers)20,000 Hz
Audible sound has a frequency of - (answers)20 to 20,000 Hz
And infrasound is a frequency less - (answers)20 Hz
And clinical imaging typical frequencies range from - (answers)1 MHz to 10 MHz
,Frequency affects what two things? - (answers)Penetration and axial resolution
What are the acoustic variables of amplitude? - (answers)Pressure, density, temperature, particle
motion
What are the units of amplitude, what is it determined by, and can the sonographer change this? -
(answers)Units depend on the acoustic variable. Pressure is pounds per square inch,
density,grams per cubic centimeter, &
pascals- temperature degrees and particle motion centimeters inches are units of distance
amplitude can also be expressed in decibels, sound source & YES can be changed by
sonographer
The rate that which work is being performed
Units? - (answers)Power
Watts
If amplitude is tripled the power is increased - (answers)9 times its original value
If amplitude is halved, power is? - (answers)The power is quartered
Concentration of energy in a sound beam? What are the units? - (answers)Intensity. Watts/cm2
Ultrasound intensity ranges from what to what and clinical imaging? - (answers).001-100 W per
centimeter squared
Intensity is directly proportional to - (answers)Power
Intensity is proportional to - (answers)Amplitude squared
If power is doubled intensity - (answers)Doubles
,If amplitude doubles, intensity? - (answers)Increases by four times
If amplitude is quartered then intensity - (answers)Is reduced to 1/16 its original value
The distance or length of a single cycle - (answers)Wavelength
Wavelength is determined by - (answers)Both the source and the medium
Wavelength equals - (answers)Propagation speed /frequency
In soft tissue = 1.54 mm / frequency in megahertz
In soft tissue sound with a frequency of 1 MHz has a wavelength of - (answers)1.54 mm
In soft tissue sound with a frequency of 2 MHz has a wavelength of - (answers).77 mm
Propagation speed is determined by - (answers)Medium only
Average speed of all sound in biological or soft tissue - (answers)1.54 km/s, 154 0 m/s, 1.54 mm
per microsecond
Speed of sound in slowest to fastest order fat, soft tissue, lung, bone - (answers)Lung, fat, soft
tissue, bone
The time from the start of one pulse to the start of the next pulse - (answers)Pulse repetition
period
As imaging depth increases pulse repetition period and pulse repetition frequency -
(answers)Increases
Decreases
, If pulse repetition frequency increases the duty factor - (answers)Increases
If imaging depth increases the duty factor - (answers)Decreases
If pulse duration increases the duty factor - (answers)Increases
Intensity that is important regarding thermal bioeffects - (answers)SPTA
Describes the spread of beam in space - (answers)Beam uniformity coefficient or SP/SA factor
Beam uniformity coefficient units and value - (answers)Unitless. Has a value of one or greater
Rank the intensities in order SPTA, SATA, SPPA, Im, SPTP - (answers)SPTP, Im, SPPA, SPTA,
SATA
If you increase the intensity by 3 dB the final intensity is - (answers)Two times bigger then the
original intensity
Increasing by 10 dB means the final intensity is - (answers)10 times bigger the original intensity
If you increase by six times the intensity is - (answers)Four times bigger than the original
intensity. Because 2×2 is four
If you increase by 9 dB the final intensity is - (answers)Eight times bigger than the original
intensity. Because 2×2 is 4×2 is eight
Attenuationis higher in both bone and lung as compared to - (answers)Soft tissue
