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Photoacoustic (PA) technology can provide information on both the physicalstructure and chemical composition of bone, showing great potential in boneassessment. However, due to the complex composition and porous structure ofcancellous bone, the PA signals generated and propagated in cancellous bone arecomplex and difficult to be directly used in cancellous bone analysis. In thispaper, a photoacoustic differential attenuation spectrum (PA-DAS) method isproposed. By eliminating the PA spectrum of the optical absorption sources, thepropagation attenuation characteristics of cancellous bone are studiedtheoretically and experimentally. An analytical solution for the propagationattenuation of broadband ultrasound waves in cancellous bone is given byapplying high-frequency and viscous corrections to Biot's theory. Anexperimental system of PA-DAS with an eccentric excitation differentialdetection system is established to obtain the PA-DAS of cancellous bone and itsacoustic propagation characteristic on the rabbit osteoporosis model. ThePA-DAS quantization parameter slope is further extracted to quantify theattenuation of high and low frequency components. The results show that thePA-DAS can distinguish osteoporotic bone from normal bone, enablingquantitative assessment of bone mineral density and the diagnosis ofosteoporosis.

Theoretical and experimental study of attenuation in cancellous bone