Table 1.

The composition of the agar-gelatin (in weight percent) used to make the phantom background and the four spherical inclusions. In all of these materials, the weight percent of gelatin is 2.93%, of formalin is 0.15%, and of Germall-Plus is 1.45%. Note that the table does not include 2.7cc (liquid) Ultra Ivory® detergent (Procter and Gamble, Cincinnati, Ohio, USA) per liter of the agar-gelatin (plus 50% oil, by volume, in inclusion 1).

Sample	Agar (%)	Glass beads (%)
Background	0.58	0.19
Inclusion 1	2.24	0
Inclusion 2	1.32	0.39
Inclusion 3	1.09	0.39
Inclusion 4	0.92	0.39