Which pair of intensities has the lowest value in ultrasound?

The pair of intensities that has the lowest value in ultrasound is SATA (Spatial Average Temporal Average) and SATP (Spatial Average Temporal Peak).

SATA represents the average intensity of the ultrasound beam over both space (spatial average) and time (temporal average), which typically yields a lower value because it takes into account the overall energy emitted over an extended period and across the beam's width. This averaging includes areas where the intensity may be lower, hence resulting in a lower overall measurement.

SATP, on the other hand, measures the average intensity of the peak amplitude of the ultrasound signal over space and is also generally lower compared to other forms of peak intensity measurements, such as SPTP (Spatial Peak Temporal Peak). While SATP is still a higher measure than SATA due to its consideration of peak amplitudes, both SATA and SATP values are on the lower end of the intensity spectrum mainly because they account for the average over a defined time period rather than just capturing peak values.

By contrast, pairs involving SPTA (Spatial Peak Temporal Average) and SPPA (Spatial Peak Pulse Average) often yield higher values dedicated to accounting for the peak pressure or power over the effective period, thus presenting stronger intensity measurements. Therefore, the