Article

Pharmacokinetic-rate images of indocyanine green for breast tumors using near-infrared optical methods

Department of Electrical, Computer, and Systems Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA.
Physics in Medicine and Biology (Impact Factor: 2.92). 03/2008; 53(4):837-59. DOI: 10.1088/0031-9155/53/4/002
Source: PubMed

ABSTRACT In this paper, we develop a method of forming pharmacokinetic-rate images of indocyanine green (ICG) and apply our method to in vivo data obtained from three patients with breast tumors. To form pharmacokinetic-rate images, we first obtain a sequence of ICG concentration images using the differential diffuse optical tomography technique. We next employ a two-compartment model composed of plasma, and extracellular-extravascular space (EES), and estimate the pharmacokinetic rates and concentrations in each compartment using the extended Kalman filtering framework. The pharmacokinetic-rate images of the three patient show that the rates from the tumor region and outside the tumor region are statistically different. Additionally, the ICG concentrations in plasma, and the EES compartments are higher around the tumor region agreeing with the hypothesis that around the tumor region ICG may act as a diffusible extravascular flow in compromised capillary of cancer vessels. Our study indicates that the pharmacokinetic-rate images may provide superior information than single set of pharmacokinetic rates estimated from the entire breast tissue for breast cancer diagnosis.

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Available from: Xavier Intes, Aug 30, 2015
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    • "In the conventional method of DFMT, the distributions of fluorophore concentration at different time points are reconstructed first and then curve-fitting or pharmacokinetic analysis technique can be applied to the distributions to obtain the time courses of fluorophore concentration [13]–[17] or pharmacokinetic-rate images [18]. The reconstruction method requires that the fluorophore concentrations are stationary during the data collection period. "
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    • "As a consequence of i)–iv), fluorescence dynamics in humans have been studied only in body-parts. The dynamic absorption and fluorescence contrast of the unspecific blood-pool tracer indocyanine green (ICG) [7], [8] have been shown to detect signs of rheumatoid arthritis [9], hemodynamic changes in diabetic feet [10], sentinel lymph nodes and lymph drainage [11]–[15], and breast cancer [16]–[20]. Feasibility studies in the brain have demonstrated that even deep tissue can be targeted [21]–[24]. "
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    • "Therefore, pharmacokinetics of ICG has the potential to provide new tools for tumor detection, diagnosis and staging. Pharmacokinetic-rate images of ICG for breast tumors using near-infrared optical methods have been also investigated for breast cancer treatment with ICG-PDT [8]. Photothermal effects on murine mammary tumors using ICG and an 808-nm diode laser effectively caused tumor cell destruction and enhanced ablation and eradicatation of tumor tissue [9]. "
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