A more accurate image can be created when the ultrasound receiver introduces _______ to some of the electrical signals.

A more accurate image can be created when the ultrasound receiver introduces _______ to some of the electrical signals.

• A. Time delays
• B. Amplitude weighting
• C. Phase shifts
• D. Frequency shifts

Answer: (A)

Time delays are used to align echoes from all elements so they add up coherently for a given point, which sharpens focus and improves image accuracy. In a multi-element ultrasound receiver, the same echo arrives at each element at slightly different times due to geometry. By introducing precise delays to some signals, the receiver compensates for these differences, effectively steering and focusing the beam. This beamforming process is what makes the image clearer and correctly localized. Amplitude weighting helps shape the beam pattern but doesn’t correct arrival times; phase shifts relate to timing but the practical implementation in the receiver is via time delays; frequency shifts don’t improve localization.

Time delays are used to align echoes from all elements so they add up coherently for a given point, which sharpens focus and improves image accuracy. In a multi-element ultrasound receiver, the same echo arrives at each element at slightly different times due to geometry. By introducing precise delays to some signals, the receiver compensates for these differences, effectively steering and focusing the beam. This beamforming process is what makes the image clearer and correctly localized. Amplitude weighting helps shape the beam pattern but doesn’t correct arrival times; phase shifts relate to timing but the practical implementation in the receiver is via time delays; frequency shifts don’t improve localization.