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(D) 8 Ultrasound Modes
MIT232
10
Medical
Undergraduate 2
06/04/2014

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Cards

Term
Explain A-Mode
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
Term
Explain B-Mode
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.
Term
Explain Real-Time imaging
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).
Term
Explain C-Mode
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.
Term
Explain 3-D imaging
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.
Term
Explain 4D imaging
Definition
3D imaging in real time.
Term
Explain M-Mode or TM-Mode.
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.
Term
Explain D-Mode
Definition
- Doppler mode or spectral analysis
- Ability to see changes in velocity over time:
> Along a line (CW doppler)
> Within a gate (PW Doppler)
Term
Explain F-Mode
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.
Term
Best to worst temporal resolution in the different US modes?
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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