Experimental evaluation of reconstruction algorithms for limited view photoacoustic tomography with line detectors

  • Paltauf G
  • Nuster R
  • Haltmeier M
 et al. 
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A method for photoacoustic tomography is presented that uses line integrals
over the acoustic wave field from a photoacoustic source for the reconstruction
of a three-dimensional image. The line integrals are acquired with an optical
line sensor based on a Mach–Zehnder interferometer. Image reconstruction
is a two-step process. In the first step data from a scan of the line outside
the object are used to reconstruct a linear projection of the source distribution.
In the second step the inverse linear Radon transform is applied to multiple
projections taken at different directions. This study focuses on the first step
comparing two different open scan curves of the line detector around the
object and corresponding two-dimensional reconstruction algorithms. An
open curve, such as a 180

arc or an ‘L’ formed by two lines, establishes
a limited view problem for which limitations exist concerning the stability
of the reconstruction. Using experimental data from phantoms, time domain
direct and iterative reconstruction algorithms as well as frequency domain (FD)
algorithms are compared. The results indicate that although the image quality
for all algorithms is similar, the FD algorithms offer much faster reconstruction
speed, whereas the time domain algorithms allow for a refinement of image
quality by including special correction procedures

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