B-mode displays are created as follows: as a sound pulse is emitted by the transducer, __________. When a reflection returns to the transducer it is _______ and the ____________.

B-mode displays are created as follows: as a sound pulse is emitted by the transducer, __________. When a reflection returns to the transducer it is _______ and the ____________.

• A. The invisible dot moves at a constant speed across the system's display; Processed; The invisible dot is turned on
• B. The invisible dot stops moving; The reflection is ignored; The dot is turned off
• C. The dot moves randomly; Reflections are stored; The dot flickers
• D. An audible beep accompanies each echo

Answer: (A)

B-mode imaging uses brightness to represent echo strength along depth as the scanner sends out pulses. Think of an invisible dot that sweeps across the screen at a constant speed while each pulse is emitted. When an echo returns, that signal is processed and the dot at the depth corresponding to that echo is turned on (bright). The brightness level can reflect how strong the echo was. This is why the described sequence—dot moving across the display, the reflection being processed, and the dot being illuminated—best captures how a B-mode image is constructed. The other descriptions don’t fit how B-mode creates a grayscale representation: stopping movement, ignoring reflections, or random flickering wouldn’t produce the continuous depth-encoded image, and audible beeps are more characteristic of other modes.

B-mode imaging uses brightness to represent echo strength along depth as the scanner sends out pulses. Think of an invisible dot that sweeps across the screen at a constant speed while each pulse is emitted. When an echo returns, that signal is processed and the dot at the depth corresponding to that echo is turned on (bright). The brightness level can reflect how strong the echo was. This is why the described sequence—dot moving across the display, the reflection being processed, and the dot being illuminated—best captures how a B-mode image is constructed. The other descriptions don’t fit how B-mode creates a grayscale representation: stopping movement, ignoring reflections, or random flickering wouldn’t produce the continuous depth-encoded image, and audible beeps are more characteristic of other modes.