Steering a linear array to form a trapezoidal display improves which aspect of image quality?

Steering a linear array to form a trapezoidal display improves which aspect of image quality?

• A. Improved axial resolution
• B. Improved lateral resolution
• C. Improved field of view
• D. Improved contrast resolution

Answer: (C)

This question tests how changing the scan geometry with a linear array affects what you can see. Steering the array to form a trapezoidal display broadens the lateral coverage of the image, effectively increasing the area imaged across the width. The trapezoidal shape comes from using multiple steering angles to cover a wider angular sector, so more tissue sits within the field of view, especially near the transducer. Axial resolution is set by the pulse length and speed of sound, not by how the beams are steered, so it isn’t improved by this display shape. Lateral resolution depends on aperture and focusing, which can vary across the field, but the main benefit of a trapezoidal display is the expanded field of view. Contrast resolution relates to the system’s dynamic range and processing, not scan geometry.

This question tests how changing the scan geometry with a linear array affects what you can see. Steering the array to form a trapezoidal display broadens the lateral coverage of the image, effectively increasing the area imaged across the width. The trapezoidal shape comes from using multiple steering angles to cover a wider angular sector, so more tissue sits within the field of view, especially near the transducer.

Axial resolution is set by the pulse length and speed of sound, not by how the beams are steered, so it isn’t improved by this display shape. Lateral resolution depends on aperture and focusing, which can vary across the field, but the main benefit of a trapezoidal display is the expanded field of view. Contrast resolution relates to the system’s dynamic range and processing, not scan geometry.