For short pulses, the blank factor is equal to the number of cycles in a pulse; the lower the blank factor, the better image quality.

For short pulses, the blank factor is equal to the number of cycles in a pulse; the lower the blank factor, the better image quality.

• A. Bandwidth
• B. Q factor
• C. Amplitude
• D. Damping factor

Answer: (B)

Short pulses come from a transducer that supports a broad range of frequencies. The factor that links resonance quality to pulse length is the Q factor, defined as the center frequency divided by the bandwidth. A lower Q factor means a wider bandwidth, which allows the emitted pulse to be shorter and contain fewer cycles. Fewer cycles in a pulse lead to better axial resolution, thus improving image quality. The bandwidth and damping concepts support this link, but the Q factor specifically describes how the resonance quality controls pulse duration and the number of cycles, making it the best fit for the statement.

Short pulses come from a transducer that supports a broad range of frequencies. The factor that links resonance quality to pulse length is the Q factor, defined as the center frequency divided by the bandwidth. A lower Q factor means a wider bandwidth, which allows the emitted pulse to be shorter and contain fewer cycles. Fewer cycles in a pulse lead to better axial resolution, thus improving image quality. The bandwidth and damping concepts support this link, but the Q factor specifically describes how the resonance quality controls pulse duration and the number of cycles, making it the best fit for the statement.