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Optics Express

Optics Express

  • Vol. 17, Iss. 7 — Mar. 30, 2009
  • pp: 5125–5138

Effects of sampling strategy on image quality in noncontact panoramic fluorescence diffuse optical tomography for small animal imaging

Xiaofeng Zhang and Cristian Badea  »View Author Affiliations


Optics Express, Vol. 17, Issue 7, pp. 5125-5138 (2009)
http://dx.doi.org/10.1364/OE.17.005125


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Abstract

Fluorescence diffuse optical tomography is an emerging technology for molecular imaging with recent technological advances in biomarkers and photonics. The introduction of noncontact imaging methods enables very large-scale data acquisition that is orders of magnitude larger than that from earlier systems. In this study, the effects of sampling strategy on image quality were investigated using an imaging phantom mimicking small animals and further analyzed using singular value analysis (SVA). The sampling strategy was represented in terms of a number of key acquisition parameters, namely the numbers of sources, detectors, and imaging angles. A number of metrics were defined to quantitatively evaluate image quality. The effects of acquisition parameters on image quality were subsequently studied by varying each of the parameters within a reasonable range while maintaining the other parameters constant, a method analogue to partial derivative in mathematical analysis. It was found that image quality improves at a much slower rate if the acquisition parameters are above certain critical values (~5 sources, ~15 detectors, and ~20 angles for our system). These critical values remain virtually the same even if other acquisition parameters are doubled. It was also found that increasing different acquisition parameters improves image quality with different efficiencies in terms of the number of measurements: for a system characterized by a smaller threshold in SVA (less than 10-5 in our study), the number of sources is the most efficient, followed by the number of detectors and subsequently the number of imaging angles. However, for systems characterized by a larger threshold, the numbers of sources and angles are equally more efficient than the number of detectors.

© 2009 Optical Society of America

OCIS Codes
(110.3000) Imaging systems : Image quality assessment
(110.6880) Imaging systems : Three-dimensional image acquisition
(110.6960) Imaging systems : Tomography
(170.3880) Medical optics and biotechnology : Medical and biological imaging

ToC Category:
Medical Optics and Biotechnology

History
Original Manuscript: November 13, 2008
Revised Manuscript: February 13, 2009
Manuscript Accepted: March 9, 2009
Published: March 17, 2009

Virtual Issues
Vol. 4, Iss. 5 Virtual Journal for Biomedical Optics

Citation
Xiaofeng Zhang and Cristian Badea, "Effects of sampling strategy on image quality in noncontact panoramic fluorescence diffuse optical tomography for small animal imaging," Opt. Express 17, 5125-5138 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-7-5125


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