Temporal backward projection of optoacoustic pressure transients using Fourier transform methods

Citation
Kp. Kostli et al., Temporal backward projection of optoacoustic pressure transients using Fourier transform methods, PHYS MED BI, 46(7), 2001, pp. 1863-1872
Citations number
20
Categorie Soggetti
Multidisciplinary
Journal title
PHYSICS IN MEDICINE AND BIOLOGY
ISSN journal
00319155 → ACNP
Volume
46
Issue
7
Year of publication
2001
Pages
1863 - 1872
Database
ISI
SICI code
0031-9155(200107)46:7<1863:TBPOOP>2.0.ZU;2-7
Abstract
In medical imaging different techniques have been developed to gain informa tion from inside a tissue. Optoacoustics is a method to generate tomography pictures of tissue using Q-switched laser pulses. Due to thermal and press ure confinement, a short light pulse generates a pressure distribution insi de tissue, which mirrors absorbing structures and can be measured outside t he tissue. Using a temporal back-projection method, the pressure distributi on measured on the tissue surface allows us to gain a tomography picture of the absorbing structures inside tissue. This study presents a novel comput ational algorithm, which, at least in principle, yields an exact reconstruc tion of the absorbing structures in three-dimensional space inside the tiss ue. The reconstruction is based on 2D pressure distributions captured outsi de at different delay times. The algorithm is tested in a simulation and ba ck-projection of pressure transients of a small absorber and a single point source.