基于δ声波场的生物组织光学断层成像研究

利用δ声波场和近红外光漫射理论实现生物组织的断层成像是一种新颖医学 成像方法. 通过构建一个δ声波场并作用到生物组织中，仅改变组织内作用点上的光学特性参数，并影响近红外光在组织中的传播特性而改变组织表面的光强分布. 利用组织表面光强改变量与作用点上组织光学参数改变量之间的内在关系，可以通过对δ声波场作用点上断层的扫描实现组织内部的断层成像. 该方法具有广泛的临床医学应用前景，为乳腺癌的早期检测提供一种有效方法. 关键词： 光学断层成像 δ声波场 漫射方程 生物组织

The optical tomography of tissues by a δ sound field

A new method for realizing the optical tomography of bio-tissue by using a δ sound field and a near infrared laser is presented. A δ sound field is cons tructed and is acted upon the tissue, and this causes some variations of optical properties at the action spot . A perturbation of the light intensity distribution on the tissue surface is measured. The inherent relations between the perturbation and the variations of optical properties are discussed. The optical property distribution in the tissue volume can be extracted from the light distributions on the tissue surface by scanning the action spot at the layer to be constructed. The present method is useful for clinic applications and diagnoses of breast cancers at early stage.