Which term describes the comparison between the bandwidth and the operating frequency?

Which term describes the comparison between the bandwidth and the operating frequency?

• A. Fractional bandwidth
• B. Fundamental frequency
• C. Amplitude
• D. Density

Answer: (A)

Fractional bandwidth describes how wide the signal’s bandwidth is relative to the operating frequency. In ultrasound, you have a center (operating) frequency and a bandwidth that spans the range of frequencies the transducer effectively uses. Fractional bandwidth is the bandwidth divided by the center frequency, often expressed as a percentage. This measure shows how broad the spectrum is around the center frequency: a larger fractional bandwidth means a broader spectrum and typically a shorter pulse, which improves axial resolution. The fundamental frequency is simply the main frequency of the waveform, not a ratio; amplitude refers to signal strength, and density is not related to the frequency content.

Fractional bandwidth describes how wide the signal’s bandwidth is relative to the operating frequency. In ultrasound, you have a center (operating) frequency and a bandwidth that spans the range of frequencies the transducer effectively uses. Fractional bandwidth is the bandwidth divided by the center frequency, often expressed as a percentage. This measure shows how broad the spectrum is around the center frequency: a larger fractional bandwidth means a broader spectrum and typically a shorter pulse, which improves axial resolution. The fundamental frequency is simply the main frequency of the waveform, not a ratio; amplitude refers to signal strength, and density is not related to the frequency content.