Without interpolation, which of the following would best describe the resultant B-mode image?

• A. Series of scan lines with blank data between the lines
• B. Very weak echoes in the far field compared to the near field
• C. Poor differentiation between the ultrasound signal and the noise floor
• D. Saturation of the white shades on the ultrasound monitor

Answer: (A)

In B-mode imaging, multiple scan lines are acquired to form a 2D image, and interpolation fills in the spaces between those lines to create a continuous grayscale field. If interpolation isn’t used, there’s no data to estimate what lies between the captured lines, so the display shows the actual acquired lines with blank areas in between. That yields a image described as a series of scan lines with blank data separating them, rather than a seamless image.

The other scenarios don’t describe missing data between lines. Echo strength differences with depth relate to attenuation, not gaps between lines. Poor differentiation between signal and noise floor points to overall noise or contrast issues, not missing inter-line data. Saturation of the white shades on the monitor concerns display brightness or gain, not the presence or absence of data between scan lines.