Which mode provides a two-dimensional grayscale image of anatomy?

Which mode provides a two-dimensional grayscale image of anatomy?

• A. M-mode
• B. B-mode
• C. Doppler mode
• D. Elastography

Answer: (B)

In ultrasound imaging, the mode that produces a two-dimensional grayscale image of anatomy is B-mode, which stands for brightness mode. In this mode, each scan line generates a strip of brightness values that correspond to the strength of the echoes coming back from tissues. When many scan lines are combined across the area, a cross-sectional image appears where different shades of gray reveal boundaries and structures—organs, vessels, and pathologies—providing a clear map of anatomy in real time. M-mode, by contrast, follows a single line over time, giving a depth-time trace that shows motion rather than a full two-dimensional view. Doppler modes (color or spectral) focus on movement and velocity, typically of blood flow, and are layered onto the grayscale anatomy but do not alone create a standard 2D grayscale image. Elastography highlights tissue stiffness, not normal grayscale anatomy.

In ultrasound imaging, the mode that produces a two-dimensional grayscale image of anatomy is B-mode, which stands for brightness mode. In this mode, each scan line generates a strip of brightness values that correspond to the strength of the echoes coming back from tissues. When many scan lines are combined across the area, a cross-sectional image appears where different shades of gray reveal boundaries and structures—organs, vessels, and pathologies—providing a clear map of anatomy in real time.

M-mode, by contrast, follows a single line over time, giving a depth-time trace that shows motion rather than a full two-dimensional view. Doppler modes (color or spectral) focus on movement and velocity, typically of blood flow, and are layered onto the grayscale anatomy but do not alone create a standard 2D grayscale image. Elastography highlights tissue stiffness, not normal grayscale anatomy.