You can reduce beam width to improve spatial resolution in the image by which of the following?

You can reduce beam width to improve spatial resolution in the image by which of the following?

• A. Increasing aperture
• B. Focusing
• C. Increasing transducer diameter
• D. Increasing backing material

Answer: (B)

Beam width determines how sharply you can distinguish objects positioned side by side in the image. When the beam is narrower, features that are close laterally appear more separated, giving better spatial resolution. Focusing directly narrows the beam at a chosen depth by shaping the wavefront so energy converges to a focal point. This creates a tighter main lobe at that depth, reducing beam width where you’re imaging and thus enhancing lateral resolution there. Modern probes use electronic or mechanical focusing to achieve this targeted narrowing. While increasing aperture or transducer diameter can also reduce beam width in principle, those are hardware design characteristics not easily adjusted during a scan, and the question highlights what you can apply to improve resolution in the image itself. Increasing backing material mainly affects damping and bandwidth rather than beam width, so it doesn’t directly improve lateral resolution.

Beam width determines how sharply you can distinguish objects positioned side by side in the image. When the beam is narrower, features that are close laterally appear more separated, giving better spatial resolution.

Focusing directly narrows the beam at a chosen depth by shaping the wavefront so energy converges to a focal point. This creates a tighter main lobe at that depth, reducing beam width where you’re imaging and thus enhancing lateral resolution there. Modern probes use electronic or mechanical focusing to achieve this targeted narrowing.

While increasing aperture or transducer diameter can also reduce beam width in principle, those are hardware design characteristics not easily adjusted during a scan, and the question highlights what you can apply to improve resolution in the image itself. Increasing backing material mainly affects damping and bandwidth rather than beam width, so it doesn’t directly improve lateral resolution.