Table 2:

Table of the properties of the three phantoms used in Appendix D. Attenuation slope values are the results of a linear fit of attenuation versus frequency using through-transmission estimates of attenuation from 2.5–10 MHz. BSC values were measured using a single element transducer via the planar reflector approach of BSC estimation (Insana et al., 1990). BSC values are reported at the middle of the 4–9 MHz bandwidth chosen for analysis.

	Speed of Sound	Attenuation Slope	BSC (@ 6.5 MHz)
‘1540 m/s’	1539 m/s	0.67 dB·cm⁻¹MHz⁻¹	0.0038 cm⁻¹sr⁻¹
‘75–90 micron’	1533 m/s	0.78 dB·cm⁻¹MHz⁻¹	0.0098 cm⁻¹sr⁻¹
‘125–150 micron’	1533 m/s	0.94 dB·cm⁻¹MHz⁻¹	0.0161 cm⁻¹sr⁻¹