within the epoxy clay nano composite the amount of catalyst provided in the resin based composite ranges from about 1 0 weight percent to about 40 weight percent based on the weight of the resin based composite desirably for medium density cortical bone phantom from about 0 5 weight percent to about 5 0 weight percent based on the weight of the resin based composite in case of trabecular bone phantom material the resin based composite is further provided with organic or inorganic particulate material component to form the resin based composition the particulate material component may include different known organic and inorganic materials for example the particulate material may be poppy seeds hemp seeds polyurethane particles silicone particles hydrogel particles gelatin and mixtures thereof in one particular example the particulate material components are hemp seeds the amount of the particular material component in the resin based composition ranges from about 5 weight percent to about 70 weight percent based on the total weight of the resin based composition that allows to vary porosity between 5 and 70 desirably for medium porosity trabecular bone phantom from about 20 weight percent to about 50 weight percent based on the total weight of the resin based composition fig1 is a flow chart showing a method of preparing an ultrasonic bone phantom material compatible with mri referring to fig1 the method of preparing ultrasonic bone phantom material includes the following steps first in step s 1 a body of a resin based cortical bone phantom composition is formed by mixing a resin a resin hardener ceramic powders and a catalyst or a body of a resin based trabecular bone phantom composition is formed by mixing a resin a resin hardener ceramic powders organic and inorganic particular.