Edelman SPI Review | Q&A Prep Guide | Updated 2026 | Verified Content

Edelman SPI Review | Q&A Prep Guide |
Updated 2026 | Verified Content
• sound waves are: -✓✓longitudinal and mechanical

• The speed of US in soft tissue is closest to: -✓✓1,500 m/s

• the frequency closest to the lower limit of ultrasound is: -✓✓15,000Hz

• which is not an acoustic variable? -✓✓intensity

• the effects of soft tissue on US are called: -✓✓acoustic propagation properties

• all the following are true EXCEPT -✓✓two waves with identical frequencies
must interfere constructively

• put in decreasing order: deca, deci, micro, centi -✓✓deca, deci, centi, & micro

• ______ is the time to complete one cycle. -✓✓period

• which of the following sound waves is ultrasonic and least useful in diagnostic
imaging? -✓✓30 KHz

• what is the frequency of a wave with 1 msec period? -✓✓1 kHz

• ______ is the distance covered by one cycle. -✓✓wavelength

• which of the following is determined by the source and the medium? -✓✓range
resolution

• propagation speed = ______ x wavelength -✓✓frequency

• as a result of ______ the propagation speed increases. -✓✓decreasing
compressibility and decreasing density

,• put in decreasing order of propagation speed: gas, liquid, solid -✓✓solid, liquid,
gas

• in the same medium, if the frequency of US is increased from 0.77MHz to 1.54
MHz, what happens to the wavelength? -✓✓halved

• a sound wave's frequency is 10 MHz. the wave is traveling in soft tissue. what is
its wavelength? -✓✓0.15 mm

• if the frequency of an US wave is doubled, what happens to the period? -
✓✓halved

• if the frequency of US is increased from 0.77 MHz to 1.54 MHz, what happens to
the propagation speed? -✓✓remains the same

• the units of pulse repetition frequency are -✓✓per minute

• the time from the beginning of a pulse until its end is _____? -✓✓pulse duration

• what happens to the speed of sound in a medium when the bulk modulus of the
medium increases? -✓✓faster

• ______ resolution is determined by the spatial pulse length. -✓✓radial & axial

• if a wave's amplitude is doubled, what happens to the power? -✓✓quadrupled

• power of sound has units of -✓✓watts

• if the intensity of a sound beam remains unchanged while the beam area is
reduced in half, what has happened to the power? -✓✓halved

• which of these intensities is smallest? SATP, SPTP, SATA -✓✓SATA

• the duty factor for continuous wave ultrasound is -✓✓1.0

• what is the minimum value of the duty factor? -✓✓0.0%

, • what are the units of intensity? -✓✓watts/cm squared

• what happens to the speed of sound in a medium when the bulk modulus of the
medium decreases? -✓✓slower

• the units of attenuation are _____; this is a ______ scale. -✓✓dB, logarithmic

• sound intensity is decreased by 75%. how many decibels of attenuation is this? -
✓✓6 dB

• the fundamental frequency of a transducer is 2.5 MHz. what is the second
harmonic frequency? -✓✓5 MHz

• a pulse is emitted by a transducer and is traveling in soft tissue. the go-return
time, or time-of-flight, of a sound pulse is 130 microseconds. what is the reflector
depth? -✓✓10 cm

• if a 5 MHz sound wave is traveling in the tissues listed below, which will have
the shortest wavelength? -✓✓air

• if a 5 MHz sound wave is traveling in the tissues listed below, which will have
the longest wavelength? -✓✓bone

• what is the approximate attenuation coefficient of 1 MHz US in soft tissue? -
✓✓0.5 dB/cm

• the rayl is the unit of: -✓✓impedance

• impedance is the ______ of ______ and ______. -✓✓product, propagation speed,
density

• what are attenuation's three components? -✓✓scattering, reflection, absorption

• for soft tissue, the approximate attenuation coefficient in dB/cm is equal to one-
half _____ in ______. -✓✓frequency, MHz

• as the impedances of two media become vastly different, the -✓✓reflection
increases