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Improvement of Image Quality in Photoacoustic Imaging Based on Synthetic Aperture Techniques

Hakakzadeh, Soheil | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54368 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Kavehvash, Zahra
  7. Abstract:
  8. Photoacoustic imaging is one of the nascent imaging methods that has received a lot of attention in the last two decades. There are two major imaging challenges with this method, including the finite size of the transducer element and the limited view angles of the photoacoustic tomography arrangement. To compensate for the effects of finite transducer size, we have proposed a multi-angle detection method for circular photoacoustic imaging systems based on the synthetic aperture techniques, in the proposed method, each transducer, in addition to rotating around the scan center, also has a rotation in the around its center. This rotation depends on the cut-off frequency, the diameter of the element, and the radius of the imaging region of interest. Reduction of artifacts and uniform location independent tangential resolution in the whole region of interest can be achieved by using the proposed method. For validation, simulated and experimental phantoms were used. In addition, for the limited view challenge, a unipolar limited view tomography algorithm was proposed that compensates for the blind angles of a 180-degree circular tomographic structure based on using photoacoustic signal and its derivative. For this method simulation phantoms were used for validation. The results showed that by using the proposed method for 180 degrees limited view array the image quality will be close to 360 degrees
  9. Keywords:
  10. Photoacoustic Tomography ; Unipolar Limited-View Photoacoustic Tomography ; Blind Angle ; Uniform Tangential Resolution ; Artifacts Reduction ; Image Enhancement ; Synthetic Aperture Imaging

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