Analysis of negatively focused ultrasound detectors in optoacoustic tomography

Gilad Drozdov, Amir Rosenthal

Research output: Contribution to journalArticlepeer-review

Abstract

In optoacoustic tomography, negatively focused transducers may be used for improving the tangential image resolution while preserving a high signal-to-noise ratio. Commonly, image reconstruction in such scenarios is facilitated by the use of the virtual-detector approach. Although the validity of this approach has been experimentally verified, it is based on an approximation whose effect on optoacoustic image reconstruction has not yet been studied. In this paper, we analyze the response of negatively focused acoustic detectors in 2D in both time and frequency domains. Based on this analysis, tradeoffs between the detector size, curvature, and sensitivity are formulated. In addition, our analysis reveals the geometrical underpinning of the virtual-detector approximation and quantifies its deviation from the exact solution. The error involved in the virtual-detector approximation is studied in image reconstruction simulations and its effect on image quality is shown. The theoretical tools developed in this work may be used in the design of new optoacoustic detection geometries as well as for improved image reconstruction.

Original languageEnglish
Pages (from-to)301-309
Number of pages9
JournalIEEE transactions on medical imaging
Volume36
Issue number1
DOIs
StatePublished - Jan 2017

Keywords

  • Acoustic detection
  • negative focusing
  • optoacoustic tomography
  • photoacoustic tomography
  • spatial impulse response
  • virtual detector

All Science Journal Classification (ASJC) codes

  • Software
  • Radiological and Ultrasound Technology
  • Computer Science Applications
  • Electrical and Electronic Engineering

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