Imaging frame rate decreases when you:

Imaging frame rate decreases when you:

• A. Increase dynamic range
• B. Decrease frequency
• C. Increase sector width
• D. Increase frame averaging

Answer: (C)

Expanding the sector width increases the number of scan lines needed to form each image frame. More lines mean more data to acquire within the same depth window, which takes more time, so the total time per frame grows and the frame rate drops. The other options mainly affect image quality or processing rather than how many lines are collected per frame: changing dynamic range alters gray-scale mapping, altering frequency changes penetration and resolution but not the line count per frame, and frame averaging reduces the displayed frame rate by blending multiple frames, though the primary driver here is the increased line count from a wider sector.

Expanding the sector width increases the number of scan lines needed to form each image frame. More lines mean more data to acquire within the same depth window, which takes more time, so the total time per frame grows and the frame rate drops. The other options mainly affect image quality or processing rather than how many lines are collected per frame: changing dynamic range alters gray-scale mapping, altering frequency changes penetration and resolution but not the line count per frame, and frame averaging reduces the displayed frame rate by blending multiple frames, though the primary driver here is the increased line count from a wider sector.