Term
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Definition
- Amplitude Mode
- Oldest and most simple type of imaging
- Displays in one-dimensional information: A vs.D
> Amplitude = y-axis
> Depth = x-axis
- Still used i:
> Opthalmology to measure thickness of the cornea
> Otolarynology to examine maxillary sinuses
> Neurology to determine midline shift |
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Term
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Definition
- Brightness mode
- TWO DEMENSIONAL image is produced using A-mode information obtained from multiple lines.
- Amplitude is represented by pixels. Brightness of the pixels represents the strength of the amplitude (intensity) from electrical signals (ie. returning echoes)
- B mode scanning can be performed with:
> A single transducer on an articulating arm (B-scanner or static B-scanner)
> A real-time scanner such as a mechanical scanner or electronic array. |
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Term
| Explain Real-Time imaging |
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Definition
- Several B-mode images (frames) are displayed per second giving an impression of motion.
- Mode B-mode frames displayed the better the ability to see changes in time (Frame rate). |
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Term
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Definition
- Constant depth mode
- A gate is used to only receive echoes from a specific depth.
- Echoes received from a specific depth is imaged in the plane and is at a CONSTANT depth from the transducer and perpendicular to the beam.
- A cross-sectional image is created. |
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Term
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Definition
- Multiple B-mode scans are performed at equal intervals by either a MULTIDIMENSIONAL (3D or 4D) transducer or a hand sweep.
- Computer reconstructs a 3D image. |
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Term
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Definition
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Term
| Explain M-Mode or TM-Mode. |
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Definition
- Motion Mode or Time Motion Mode
- The same line is rescanned to display changes in motion with time.
- Amplitude is still represented by brightness of a pixel.
- Very accurately represents motion of heart valves. |
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Term
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Definition
- Doppler mode or spectral analysis
- Ability to see changes in velocity over time:
> Along a line (CW doppler)
> Within a gate (PW Doppler) |
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Term
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Definition
- Color Mode, including:
> traditional color mode
> variance mode
> power doppler
- Selected box is rescanned and color of the pixel represents velocity of the motion. |
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Term
| Best to worst temporal resolution in the different US modes? |
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Definition
My Dick Bones Fat Asses
1. M-mode
2. D-mode
3. B-mode
4. F-mode
5. A-mode |
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