sonography principles and instruments Questions and answers
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Course
Sonography
Institution
Sonography
reflection
return of the ultrasound wave to the transducer from a smooth surface
when does the greatest amount of reflection occur
when the incident beam is perpendicular to structure (specular reflection)
scatter
deflection of ultrasound waves from small structures (red blood cell...
transducer frequency is ___ proportional to penetration and directly
proportional to resolution - answer inversely
name three things that are inversely proportional to transmitted
frequency - answer beam width, spatial pulse length and pulse
duration
Annular array - answer 5 concentric ring shaped piezoelectric
elements that produces a cylindrical beam (sector shaped image)
requires mechanical steering
with an annular phased array outer elements image ___. Central
elements image ____. - answer outer - image deeper structures
inner elements- superficial structures
sequential linear array - answer AKA switch array
200 rectangle elements across face of transducer
parallel acoustic lines are transmitted sequentially
uses mechanical focusing (curved lense or crystal)*
, what transducer has the same field of view in near and far fields
( no trapezoid FOV) - answer switched array (sequential linear array)
linear phased array - answer contains 200 elements
elements fired at varied times to allow for electronic focusing &
beam steering
phasing creates trapezoidal FOV
curved sequential array - answer similar construction & function as
a sequential linear array
no beam steering
blunted sector FOV
Requires mechanical focusing
curved linear phased array - answer AKA
curvilinear array or convex array
contains a large number of linearly arranged piezoelectric elements
(120-250)
sequentially pulsed transducer elements
produced blunted/ curved sector image with a larger near field
footprint
uses electronic focusing & steering
sector phased array - answer small footprint with a large number of
linearly arranged rectangular piezoelectric elements
triangle shape created by electronic steering
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