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Fluorescence background subtraction technique for hybrid fluorescence molecular tomography/X-ray computed tomography imaging of a mouse model of early stage lung cancer.

J. Biomed. Opt. 18:56006 (2013)
Verlagsversion Volltext DOI
Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
ABSTRACT. The ability to visualize early stage lung cancer is important in the study of biomarkers and targeting agents that could lead to earlier diagnosis. The recent development of hybrid free-space 360-deg fluorescence molecular tomography (FMT) and x-ray computed tomography (XCT) imaging yields a superior optical imaging modality for three-dimensional small animal fluorescence imaging over stand-alone optical systems. Imaging accuracy was improved by using XCT information in the fluorescence reconstruction method. Despite this progress, the detection sensitivity of targeted fluorescence agents remains limited by nonspecific background accumulation of the fluorochrome employed, which complicates early detection of murine cancers. Therefore we examine whether x-ray CT information and bulk fluorescence detection can be combined to increase detection sensitivity. Correspondingly, we research the performance of a data-driven fluorescence background estimator employed for subtraction of background fluorescence from acquisition data. Using mice containing known fluorochromes ex vivo, we demonstrate the reduction of background signals from reconstructed images and sensitivity improvements. Finally, by applying the method to in vivo data from K-ras transgenic mice developing lung cancer, we find small tumors at an early stage compared with reconstructions performed using raw data. We conclude with the benefits of employing fluorescence subtraction in hybrid FMT-XCT for early detection studies.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Fluorescence Tomography ; Image Reconstruction ; Multimodality ; Targeted Fluorescence Agent; In-vivo ; Optical Tomography ; Mice ; Microscopy
ISSN (print) / ISBN 1083-3668
e-ISSN 1560-2281
Quellenangaben Band: 18, Heft: 5, Seiten: , Artikelnummer: 56006 Supplement: ,
Verlag SPIE
Begutachtungsstatus Peer reviewed