The paper presents a survey of mathematical problems, techniques, and challenges arising in the Thermoacoustic (also called Photoacous-tic or Optoacoustic) Tomography.
The limited-view problem is studied for thermoacoustic tomography, which is also referred to as photoacoustic or optoacoustic tomography depending on the type of radiation for the induction of acoustic waves. We define a "detection region," within which all points have sufficient detection views. It is explained analytically and shown numerically that the… (More)
These notes represent an extended version of the contents of the third lecture delivered at the AMS Short Course " Radon Transform and Applications to Inverse Problems " in Atlanta in January 2005. They contain a brief description of properties of some generalized Radon transforms arising in inverse problems. Here by generalized Radon transforms we mean… (More)
We propose and test stable algorithms for the reconstruction of the internal conductivity of a biological object using acousto-electric measurements. Namely, the conventional impedance tomography scheme is supplemented by scanning the object with acoustic waves that slightly perturb the conductivity and cause the change in the electric potential measured on… (More)
The paper starts with a comparative discussion of features and limitations of the three types of recent approaches to the reconstruction in thermoacoustic/photoacoustic tomography: backprojection formulas, eigenfunction expansions, and time reversal. The latter method happens to be the least restrictive. It is then considered in more detail, e.g. its… (More)
We investigate the band-gap structure of the spectrum of second-order partial differential operators associated with the propagation of waves in a periodic two-component medium. The medium is characterized by a real-valued position-dependent periodic function "(x) that is the dielectric constant for electromagnetic waves and mass density for acoustic waves.… (More)
The paper contains a simple approach to reconstruction in Ther-moacoustic and Photoacoustic Tomography. The technique works for any geometry of point detectors placement and for variable sound speed satisfying a non-trapping condition. A uniqueness of reconstruction result is also obtained.
The transform considered in the paper averages a function supported in a ball in R n over all spheres centered at the boundary of the ball. This Radon type transform arises in several contemporary applications, e.g. in thermoacoustic tomography and sonar and radar imaging. Range descriptions for such transforms are important in all these areas, for instance… (More)
The transform considered in the paper integrates a function supported in the unit disk on the plane over all circles centered at the boundary of this disk. Such circular Radon transform arises in several contemporary imaging techniques, as well as in other applications. As it is common for transforms of Radon type, its range has infinite co-dimension in… (More)