Davies SPI Exam Study Guide with complete solutions | Latest 2025/2026 Update.

Davies SPI Exam Study Guide with complete
i,- i,- i,- i,- i,- i,- i,-




solutions | Latest 2025/2026 Update. i,- i,- i,- i,-




What phenomenon is associated with a pattern produced by a
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



sound beam after passing through a small aperture?
i,- i,- i,- i,- i,- i,- i,- i,-i,- i,-



Diffraction


Scattering intensity is proportional to :
i,- i,- i,- i,- i,- i,-i,- i,- F raised to the fourth
i,- i,- i,- i,- i,-



power


what term refers to regions of decreased particle density in a
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



sound beam? rarefaction
i,- i,-i,- i,-




-______ is a large smooth interface such as diaphragm and
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



pericardium Specular reflector i,-i,- i,- i,-




Interference patterns of reflected waves cause _____
i,- i,- i,- i,- i,- i,- i,-i,- i,- acoustic i,-



speckle


10-3 =
i,- i,-i,- i,- 1/1000

,-reduction of intensity of sound as it propagates through tissue?
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



attenuation or absorption (attenuation) i,- i,- i,-i,- i,-




what can you do to enhance the visiblity of a specular reflector?
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



scan with perp/parallel/ incidence
i,- PERP i,- i,- i,-i,- i,-




Audible frequency range of sound i,- i,- i,- i,- i,-i,- i,- 20Hz to 20000Hz ( BELOW
i,- i,- i,- i,- i,-



IS ULTRASONIC)
i,-




decrease beam intensity by increasing/decreasing beam area
i,- i,- i,- i,- i,- i,- i,-i,- i,-



INCREASING


The # of cycles in a pulse is increased but the WL remains the
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



same which is true: i,- i,- i,- i,-




-F is increased
i,- i,-




-Prop speed is increased
i,- i,- i,-




-The PD increased
i,- i,-




-The period is decreased
i,- i,- i,-




-MB decreased
i,- i,-i,- i,- The PD is increasedi,- i,- i,-




You are imaging with a 5MHz tx which parameter stays constant
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



as the beam propagates through tissue?
i,- i,- i,- i,- i,-

,1.F i,-




2. Intensity
i,- i,-




3. AMp i,- i,-




4. WL i,- i,-




5. None of these
i,- i,- i,- i,-i,- i,- none of these i,- i,-




which intensity parameter is not applicable for cw us?
i,- i,- i,- i,- i,- i,- i,- i,-




i,- SATA/ SPTA/SPPA/SAPA i,- i,-i,- ( SPPA AND SAPA)
i,- i,- i,- i,-




what has the highset SPTA value :
i,- i,- i,- i,- i,- i,- i,-




CW doppler i,-




i,- B mode real time scanenrs
i,- i,- i,- i,-




i,- Static B mode scanners i,- i,- i,-




i,- PW doppler i,-




i,- fetal monitor doppleri,- i,- i,-i,- i,- PW DOPPLER i,-




____ is defined as an acoustically generated transport of fluid
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



within the body of the isolated fluid or tissue. ( the motion of
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



particles in a fluid is sometimes observed in an intense us beam )
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-i,-



Acoustic Streaming
i,- i,-




Doppler pulses used for diagnostic purposes are typically_____
i,- i,- i,- i,- i,- i,- i,- i,-



cycles long (5-30) i,- i,-i,- i,-

, -Length of space over which one CYCLE occurs is known as the :
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-i,-



wavelength i,-




an echo from which of the following sound reflectors is most
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



dependent of the angle of incidence? specular reflection. i,- i,- i,- i,- i,- i,-i,- i,- i,-




rate of sound att is lowest in (water/air/liver/lung)
i,- i,- i,- i,- i,- i,- i,- i,-i,- i,- air


which has the highest rate of att ( liver,fat,fluid,lung,blood vessels)
i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



i,- lung i,-




maximum cyclical change in quantity is known as i,- i,- i,- i,- i,- i,- i,- i,-i,- i,- amplitude


when the sound beam is refracted during a sonographic
i,- i,- i,- i,- i,- i,- i,- i,- i,-



examination, which of the following might you detect on the us i,- i,- i,- i,- i,- i,- i,- i,- i,- i,- i,-



image? i,-




lateral misregistration or reverberation
i,- i,- i,- i,-i,- i,- Lateral misregistration i,-




a longitudinal/transverse wave is characterized by particle motion
i,- i,- i,- i,- i,- i,- i,- i,-



occurring int he same direction as propagation longitudinal
i,- i,- i,- i,- i,- i,- i,-i,- i,-