Experimental reconstruction of temperature distribution at a depth throughthermal acoustic radiation

The potential of passive thermoacoustic tomography is illustrated experimen tally. The distribution of the thermodynamic temperature at a depth in a mo del system is reconstructed from a set of measurements of the thermal noise acoustic radiation which were conducted onto the body surface. The reconst ructions were conducted by three mathematical methods, namely, (1) least sq uares method; (2) Tikhonov's regularization method; (3) the method of elimi nation of non-physical solutions. The reconstructed temperature distributio ns are rather approximate to the actual distribution determined experimenta lly. (C) 1999 Elsevier Science B.V. All rights reserved.