Which intensity is spatially averaged and temporally averaged?

Which intensity is spatially averaged and temporally averaged?

• A. SATA
• B. SPTA
• C. SPTP
• D. SP/SA Factor

Answer: (A)

Intensities in ultrasound exposure are described by how energy is distributed in space and how it varies over time. The descriptor that means the energy is averaged across the beam area and also averaged over time is the one that combines spatial averaging with temporal averaging. This is the SATA value. Spatial averaging means you average the intensity across the cross-section of the beam, smoothing out any hot spots. Temporal averaging means you average over time, including the duty cycle of any pulsing. The other descriptors involve either taking a peak value in space (spatial peak) or a peak value in time (temporal peak), or they’re ratios rather than a direct intensity measure. So the intensity that is spatially averaged and temporally averaged is SATA.

Intensities in ultrasound exposure are described by how energy is distributed in space and how it varies over time. The descriptor that means the energy is averaged across the beam area and also averaged over time is the one that combines spatial averaging with temporal averaging. This is the SATA value.

Spatial averaging means you average the intensity across the cross-section of the beam, smoothing out any hot spots. Temporal averaging means you average over time, including the duty cycle of any pulsing. The other descriptors involve either taking a peak value in space (spatial peak) or a peak value in time (temporal peak), or they’re ratios rather than a direct intensity measure.

So the intensity that is spatially averaged and temporally averaged is SATA.