光声成像理论基础

根据光声现象的基本物理过程，针对非气体介质，首次提出了光声成像理论，光声信号是用剩余压强来描述的，以迅速加热为条件研究了液态光声压强的一个解，对有限体积的物体提出了完备的光声成像再现理论，此理论根据安放在一个半球上的换能器件阵列所测得的压强信号，就能将一物体的辐射能量吸收密度经两步实现三维再现。第一步与三维背后投影法相似，第二步是一个线性变换，这种变换与求解具有对称核的第一类Ｆｒｅｄｈｏｌｍ积分主

Photoacoustic imaging theory

Photoacoustic imaging theory is presented based on fundamental physical processes involved in photoacoustic phenomena. Excessive pressure is used to characterize the photoacoustic signal. A solution to photoacoustic pressure derived for liquids is investigated under a rapid heating condition. A complete photoacoustic image reconstruction theory is proposed for an object with a limited volume. The theory is able to perform three dimensional reconstruction of the radiation energy absorption density of an object from pressure signals measured by an array of transducers arranged on a hemisphere in two steps. The first step is to perform a procedure similar to a three dimensional (3D) back projection. The second step is a linear transform which is equivalent to the solution for a Fredholm integral equation of the first kind with a symmetrical kernel.