Three-dimensional phantoms for curvature correction in spatial frequency domain imaging

Thu T A Nguyen, Hanh N D Le, Minh Vo, Zhaoyang Wang, Long Luu, Jessica C. Ramella-Roman

Research output: Contribution to journalArticlepeer-review

Abstract

The sensitivity to surface profile of non-contact optical imaging, such as spatial frequency domain imaging, may lead to incorrect measurements of optical properties and consequently erroneous extrapolation of physiological parameters of interest. Previous correction methods have focused on calibration-based, model-based, and computation-based approached. We propose an experimental method to correct the effect of surface profile on spectral images. Three-dimensional (3D) phantoms were built with acrylonitrile butadiene styrene (ABS) plastic using an accurate 3D imaging and an emergent 3D printing technique. In this study, our method was utilized for the correction of optical properties (absorption coefficient μa and reduced scattering coefficient μs′) of objects obtained with a spatial frequency domain imaging system. The correction method was verified on three objects with simple to complex shapes. Incorrect optical properties due to surface with minimum 4 mm variation in height and 80 degree in slope were detected and improved, particularly for the absorption coefficients. The 3D phantom-based correction method is applicable for a wide range of purposes. The advantages and drawbacks of the 3D phantom-based correction methods are discussed in details.

Original languageEnglish (US)
Pages (from-to)1200-1214
Number of pages15
JournalBiomedical Optics Express
Volume3
Issue number6
DOIs
StatePublished - Jun 1 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Biotechnology

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