Which pair of intensities is acknowledged to have the same value?

The pair of intensities known to have the same value is pulse average and temporal average. Pulse average intensity is defined as the average intensity over one pulse period, while temporal average intensity refers to the average intensity over an entire time, including both the on and off phases of the pulse. In continuous wave ultrasound, where there is no off time, these two averages would indeed have the same value. However, in pulsed ultrasound, while pulse average takes into account only the active pulse duration, temporal average integrates over the entire pulse repetition period. In cases where the duty cycle is considered, and if the system is operating in a typical pulsed mode, these two can yield the same value under certain conditions.

The relationship between these two intensity measurements is critical for understanding how ultrasound energy is distributed and how exposure affects tissues. This knowledge can help in optimizing ultrasound settings in clinical practice to minimize risks while ensuring diagnostic efficacy.