Journal
JOURNAL OF BIOMEDICAL OPTICS
Volume 13, Issue 5, Pages -Publisher
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
DOI: 10.1117/1.2992131
Keywords
photoacoustic imaging (PAI); optical absorption; three-dimensional imaging; ultrasound array; image reconstruction algorithm; iterative back-projection
Funding
- Academic Development Fund (ADF) at the University of Western Ontario
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- MultiMagnetics, Inc.
- Ontario Research and Development Challenge Fund (ORDCF)
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Photoacoustic imaging (PAI) has the potential to acquire 3-D optical images at high speed. Attempts at 3-D photoacoustic imaging have used a dense 2-D array of ultrasound detectors or have densely scanned a single detector on a 2-D surface. The former approach is costly and complicated to realize, while the latter is inherently slow. We present a different approach based on a sparse 2-D array of detector elements and an iterative reconstruction algorithm. This approach has the potential for fast image acquisition, since no mechanical scanning is required, and for simple and compact construction due to the smaller number of detector elements. We obtained spatial sensitivity maps of the sparse array and used them to optimize the image reconstruction algorithm. We then validated the method on phantoms containing 3-D distributions of optically absorbing point sources. Reconstruction of the point sources from the time-domain signals resulted in images with good contrast and accurate localization (<= 1 mm error). Image acquisition time was 1 s. The results suggest that 3-D PAI with a sparse array of detector elements is a viable approach. Furthermore, the rapid acquisition speed indicates the possibility of high frame rate 3-D PAI. (C) 2008 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.2992131]
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