Time-Domain Reconstruction for Thermoacoustic Tomography in a Spherical Geometry

Abstract--Reconstruction-based microwave-induced thermoacoustic tomography in a spherical configuration is presented. Thermoacoustic waves from biological tissue samples excited by microwave pulses are measured by a wide-band unfocused ultrasonic transducer, which is set on a spherical surface enclosing the sample. Sufficient data are acquired from different directions to reconstruct the microwave absorption distribution. An exact reconstruction solution is derived and approximated to a modified backprojection algorithm. Experiments demonstrate that the reconstructed images agree well with the original samples. The spatial resolution of the system reaches 0.5 mm.

• Type: Journal
• Year: 2002
• Where: TMI
• Authors: Minghua Xu, Lihong V. Wang
• Keywords: Biological Tissue Samples, Microwave-induced Thermoacoustic Tomography, TMI 2002, Unfocused Ultrasonic Transducer