The grayscale image in color Doppler exams using a linear array uses electrical patterns with which property?

The grayscale image in color Doppler exams using a linear array uses electrical patterns with which property?

• A. Positive Slope
• B. Negative Slope
• C. Alternating Slope
• D. No Slope

Answer: (D)

The key idea is beam steering and how a linear array forms a grayscale scan line. For grayscale imaging along the intended scan line, the transducer excites all elements with delays that focus along that line without tilting the beam sideways. That means the electrical pattern across the elements has no progressive slope—it's effectively flat. Focus is achieved depth by depth with dynamic timing, not by steering the beam to a different angle. If there were a positive or negative slope, the beam would be steered off-axis, and alternating slopes would produce zig-zag steering, which isn’t used for standard grayscale line formation. So the property is No Slope.

The key idea is beam steering and how a linear array forms a grayscale scan line. For grayscale imaging along the intended scan line, the transducer excites all elements with delays that focus along that line without tilting the beam sideways. That means the electrical pattern across the elements has no progressive slope—it's effectively flat. Focus is achieved depth by depth with dynamic timing, not by steering the beam to a different angle. If there were a positive or negative slope, the beam would be steered off-axis, and alternating slopes would produce zig-zag steering, which isn’t used for standard grayscale line formation. So the property is No Slope.