PuSH - Publication Server of Helmholtz Zentrum München: Multi-spectral photo-acoustic molecular tomography resolves fluorochrome distribution with high resolution and sensitivity in small animals.

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Razansky, D. ; Vinegoni, C.* ; Ntziachristos, V.

Multi-spectral photo-acoustic molecular tomography resolves fluorochrome distribution with high resolution and sensitivity in small animals.

Proc. SPIE 6856:685613 (2008)

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Current non-invasive imaging methods of fluorescent molecular probes in the visible and near-infrared suffer from low spatial resolution as a result of rapid light diffusion in biological tissues. We show that three-dimensional distribution of fluorochromes deep in small animals can be resolved with below 25 femtomole sensitivity and 150 microns spatial resolution by means of multi-spectral photo-acoustic molecular tomography. The low sensitivity limit of the method is enabled by using the highly resonant absorption spectrum of a commonly used near-infrared fluorescent molecular probe Alexa Fluor 750 in order to acquire differential images at multiple wavelengths with tomographic topology suitable for whole-body small animal imaging.

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