Which function is postprocessing in ultrasound image formation?

Which function is postprocessing in ultrasound image formation?

• A. Write-zoom
• B. Frequency change
• C. Gray-scale map assignment
• D. Acoustic power output

Answer: (C)

Postprocessing involves steps done after the image is formed to control how it is displayed. Gray-scale map assignment is the process where the actual echo intensities (numeric pixel values) are translated into brightness levels on the screen by applying a lookup table. This doesn’t change the underlying data; it simply defines how we visualize it, which is the essence of postprocessing. The other options relate to the data acquisition or real-time display adjustments rather than the display mapping itself: changing the transmit frequency or the acoustic power affects the signal before the image is created, while write-zoom is a display magnification feature. The standard postprocessing step that directly interprets and visually represents the image is the gray-scale mapping.

Postprocessing involves steps done after the image is formed to control how it is displayed. Gray-scale map assignment is the process where the actual echo intensities (numeric pixel values) are translated into brightness levels on the screen by applying a lookup table. This doesn’t change the underlying data; it simply defines how we visualize it, which is the essence of postprocessing.

The other options relate to the data acquisition or real-time display adjustments rather than the display mapping itself: changing the transmit frequency or the acoustic power affects the signal before the image is created, while write-zoom is a display magnification feature. The standard postprocessing step that directly interprets and visually represents the image is the gray-scale mapping.