Decreased the image sector width. Which of the following will most likely change as a result of this adjustment?

• A. Frame rate
• B. Axial resolution
• C. Elevational resolution
• D. Dynamic range

Answer: (A)

Decreasing the image sector width increases the frame rate. When you narrow the sector, fewer scan lines are needed to cover the same field of view, so the system can finish one frame more quickly. With the same depth setting, this reduces the time required per frame, boosting temporal resolution.

Axial resolution depends on the pulse length and spatial pulse length, which aren’t affected by how wide the sector is. Elevational resolution relates to beam thickness in the elevational plane and focusing, which also isn’t changed by sector width. Dynamic range is about the range of signal amplitudes the system can display, not the width of the sector. So the change most likely to occur is an increased frame rate.