Table 1.

Acoustic properties of mammograhic paddles. ^{* **}

Paddle	Speed of Sound (mm/μs)	Attenuation (dB/cm/MHz)	Acoustical impedance (kg/(m2s))
TPX	2.22	1.1	1.84
Lexan	2.30	4.6	2.75

^*Physical properties can vary substantially with the specific formulation of the polymer.

^**Source: Onda Corporation, “Acoustic Properties of Plastics”