Vascular sonography principles and instruments Exam Questions and Answers Latest Update Graded A+
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Course
Vascular Sonography
Institution
Vascular Sonography
VASCULAR sonography principles and instruments Exam Questions and Answers Latest Update Graded A+
Reflection - Answers return of ultrasound waves to the transducer from a smooth surface
when does the greatest amount of reflection occur - Answers when the incident beam is perpendicular to the stru...
phased annular array - Answers electronically focused by timing voltages to different elements
circular elements allow for electronic focusing in all planes at all depths to provide optimal lateral
resolution at all depths on the image - Answers
in an annular array transducer central elements are used to image ____. Outer elements are used to
image _____. - Answers central elements used to image superficial structures
outer elements used to image deep structures
Switched Arrays are also called - Answers Sequential linear Array
sequential linear array contains - Answers contains approximately 200 rectangular elements placed in a
line across the face of the transducer
how are switched arrays transmitted - Answers AKA sequential linear array
parallel acoustic lines are transmitted sequentially.
each acoustic line a single sound pulse creates by the transducer element
sequential linear array FOV - Answers same size field of view in near and far fields (no trapezoid FOV)
Sequential linear array use what type of focusing? - Answers AKA Switched arrays
use mechanical focusing (curved lense or crystal)
how is lateral resolution improved in a sequential linear array? - Answers ALA by firing a few elements at
exactly the same time to create a narrow beam
how does a sequential linear array steer the beam? - Answers AKA Switched array
, NO BEAM STEERING
what happens if an element of a switch array is damaged - Answers AKA sequential linear Array
only loss of the portion of the image produced by that element
linear phases Array contains how many elements - Answers approximately 200
linear phased array fires elements - Answers at varies times to allow for electronic focusing and beam
steering
(10 nanosecond delay between firing)
phasing in a linear phases Array is used to - Answers create a trapezoidal FOV, steer and focus the beam
electronically
electronic steering allows for - Answers a linear probe to produce a trapezoidal image
trapezoidal linear display leads to - Answers degraded lateral resolution in the far field.
axial, contrast, and elevational resolution are not affected
limitations of larger footprints - Answers difficult to obtain images in areas with small imaging windows
what would a linear phased Array be used for - Answers abdominal, OB, small parts, vascular and
musculoskeletal imaging
annular arrays are constructed with - Answers 5 concentric, ring shaped piezoelectric elements that
produce a cylindrical beam
electronic steering is not possible with circular elements
annular arrays can be focused - Answers electronically by timing voltages to different elements (phases
annular arrays)
circular elements allow for electronic _____ - Answers focusing in all planes at all depths to provide
optimal lateral resolution at all depths of the image
with an annular array ___ ____ used to image more superficial structures and ____ ___ used to image
deeper structures - Answers central - superficial
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