document: Time-domain reconstruction for thermoacoustic tomography in a spherical geometry 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
doc_bio_tags: O O O B I O O B I O O B I O O O O O O O O O O B I I O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B I I O O O O O O B I I O O O O O B I O O O O O O O O O O O O O O O O