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Sono Transducer 4

Physics of Sonography; Transducer Physics and Terms

QuestionAnswer
Define Resolution Ability to see structures as they really are
Name 3 types of Resolution Detail (spatial); Contrast; Temporal
_____ and _____ resolution relate more directly to the instrument Contrast; Temporal
Detail Resolution relates more directly to the transducer. True or False True
The ability of the system to distinguish between two closely space objects is which type of resolution Spatial Resolution
Quality of the detail of the image is Spatial Resolution. True or False? True
Give 4 types of Detail Resolution Axial; Lateral; Elevational; Contrast
Detail resolution is a percentile value. True or False False; Numerical
The smaller the numerical value, the _____ the detail resolution Better
Axial Resolution, otherwise known as... Longitudinal; Axial; Range; Depth (L.A.R.D)
Define Axial Minimum reflector separation required along the sound path
Axial reflector separation is perpendicular/parallel to the sound path Parallel
The minimum distance two reflectors can be parallel to the beam and still appear on the screen as two separate dots is known as... Axial resolution
What formula gives us the Axial resolution? One half the Spatial Pulse Length (SPL)
There must be at least a distance equal to the SPL between 2 structures for each structure to be recorded. True or False False; 1/2 the SPL
Axial Resolution is equal to... SPL divided by 2
What formula gives us the Spatial Pulse Length? SPL = Wavelength X Number of Cycles
To improve Axial resolution, the SPL must be _____ Reduced
What is the Useful Frequency Range 2 to 15 MHz
A higher/lower frequency gives us more penetration, while a higher/lower frequency gives us better resolution Lower; Higher
Imaging depth equals what? 60 divided by the frequency
Frequency limits imaging depth. True or False? True
What is Lateral Resolution? The minimum separation between two reflectors that can produce two separate echoes.
In Lateral Resolution, reflectors are in a plane _______ to the sound beam Perpendicular
Lateral Resolution is otherwise known as... Lateral; Azimuthal; Transverse; Angular (LATA)
Lateral resolution is equal to? Beam Width
Higher Frequency is equal to _____ NZL. Shorter
What happens to 2 structures if a distance less than a beam width separates the 2 structures in a perpendicular plane. Only one echo will be imaged
The best axial and lateral resolution is obtained at the ______. Focus
Transducers typically have better axial/lateral than axial/lateral resolution Axial; Lateral
Elevational Resolution is... Third dimension of the ultra sound beam
Does elevational Resolution depend on transducer element height? Yes
What are three other names for Elevational Resolution? Slice Thickness; Section Thickness; Elevational plane
How do you improve any resolution? By Focusing
The Ability to differentiate one shade of gray to another is... Contrast Resolution
Temporal Resolution is the... Ability to display structures in real time.
Created by: A-Hole
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