Which two factors are intensities reported with respect to?

The correct selection relates to the concept that intensities in the context of sonography are reported with respect to both time and space. This is important as it helps sonographers understand how an ultrasound wave propagates through tissues over time and across different spatial dimensions.

Intensity is defined as power per unit area and is critical in evaluating how ultrasound waves interact with tissues. By considering both time (duration of the pulse, for example) and space (the arrangement and size of the area the ultrasound is being applied), practitioners can optimize imaging techniques and make informed assessments based on the properties of the ultrasound waves.

In this context, time refers to how long the ultrasound pulse is transmitted, which influences intensity measurements and how they translate into image quality. Space refers to where the ultrasound waves are traveling, reflecting the varying properties of different tissues.

Other options mention factors like distance, frequency, duration, wavelength, and amplitude, but these do not capture the full scope of how intensity is assessed in practical sonography. Focusing solely on time and space provides the necessary context for evaluating the effective use of ultrasound in clinical settings.