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Sono Transducer 4
Physics of Sonography; Transducer Physics and Terms
| Question | Answer |
|---|---|
| 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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