Comparison of optical imaging and functional magnetic resonance imaging of the human brain using a photon-hitting density weight in the calculation of the BOLD signal

Angelo Sassaroli; Bruce B. Frederick; Yunjie Tong; Perry F. Renshaw; Sergio Fantini

doi:10.1117/12.659692

13 February 2006 Comparison of optical imaging and functional magnetic resonance imaging of the human brain using a photon-hitting density weight in the calculation of the BOLD signal

Angelo Sassaroli, Bruce B. Frederick, Yunjie Tong, Perry F. Renshaw, Sergio Fantini

Author Affiliations +

Proceedings Volume 6081, Multimodal Biomedical Imaging; 60810C (2006) https://doi.org/10.1117/12.659692
Event: SPIE BiOS, 2006, San Jose, California, United States

Abstract

We present a new method for the calculation of a blood oxygen level dependent (BOLD) signal which is meaningful for a quantitative comparison with near infrared spectroscopy (NIRS) data. Since optical tomography of the human brain still poses several difficulties, in this study we propose a way to project the BOLD signal on a two-dimensional (2D) map for comparison with NIRS data. The underlying assumption is that fMRI and NIRS are sensitive to similar aspects of the hemodynamic changes occurring during a functional task, and therefore they should have similar spatial and temporal features. We present a case study of functional activation during a finger-tapping test where we used the new method for the calculation of BOLD signal. For every optical source-detector pair we calculated a weighted BOLD signal by using a photon hitting-density weight function, and by using a simple back-projection algorithm we were able to generate BOLD 2D maps. We found that the weighted BOLD signals calculated from different source-detector pairs scale in a similar way to the corresponding oxy and deoxy-hemeoglobin concentration changes calculated from NIRS data, for most of the time range of the task. Therefore the BOLD 2D maps were quantitatively similar to the optical maps calculated at different times during the protocol.

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Angelo Sassaroli, Bruce B. Frederick, Yunjie Tong, Perry F. Renshaw, and Sergio Fantini "Comparison of optical imaging and functional magnetic resonance imaging of the human brain using a photon-hitting density weight in the calculation of the BOLD signal", Proc. SPIE 6081, Multimodal Biomedical Imaging, 60810C (13 February 2006); https://doi.org/10.1117/12.659692

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KEYWORDS

Near infrared spectroscopy

Functional magnetic resonance imaging

Brain

Brain mapping

Hemodynamics

Head

Neuroimaging

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