Which term refers to a series of pulses and gaps that enables multiple focal zones and harmonic imaging, and occurs in the pulser?

• A. Cine Loop
• B. Code Excitation
• C. Comet Tail
• D. Dynamic Range

Answer: (B)

Coded excitation uses a coded pulse sequence—a series of bursts with purposeful gaps—transmitted by the pulser. This approach injects more energy into the tissue over time without increasing the peak transmit intensity. After reception, a decoding process reconstructs a short, high‑peak signal, which dramatically improves signal‑to‑noise ratio and image quality. Because the transmitted code covers a broader spectrum, it enables the system to illuminate multiple focal zones more effectively and supports harmonic imaging, where tissue nonlinearity generates higher harmonics that can be isolated for sharper detail. In short, the series of pulses and gaps is the coded sequence that enhances depth focusing and harmonic information, all managed by the pulser.