Luminescence lifetime imaging system using imaging fibers to measure the 2D distribution of O2 in biological samples

TY - GEN

T1 - Luminescence lifetime imaging system using imaging fibers to measure the 2D distribution of O2 in biological samples

AU - Holst, Gerhard

AU - Grunwald, Bjoern

AU - Klimant, Ingo

AU - Kuehl, Michael

PY - 1999/12/1

Y1 - 1999/12/1

N2 - A new sensor head and imaging application with planar oxygen optodes is presented. It combines the versatility of the recently presented modular luminescence lifetime imaging system (MOLLI) and the oxygen measuring features of planar optodes to investigate the 2D-distribution of oxygen with a high spatial resolution. The marine sediments are settled by microorganisms. They are characterized by steep gradients of solutes perpendicular to the interface. Oxygen as the most favorable electron acceptor plays an important role in these communities and exhibits steep gradients within distances of 100 μm to a couple of millimeters. Traditionally these gradients are commonly accessed by either oxygen microelectrodes or oxygen microoptodes, that measure single oxygen depth profiles at spatial resolutions in the range of 50-5 μm. As the influences on the metabolism of these organisms are complex, profiles that are measured at one location exhibit a natural heterogeneity. To address this problem by using the potential of planar oxygen optodes first measurements with optodes fixed to an aquarium wall (Glud et al. 1996) based on luminescence intensity measurements have been published. They showed the large amount of information that can be gathered by this method. We further developed this approach by combining the planar optode with the capabilities of imaging fibers that form an endoscope. We developed a periscope type sensor head that can be independently applied in biological samples. It has an overall diameter of 2.5 mm and a calculated pixel resolution of 12 μm. The according measuring system compared to the published system has a different excitation light setup and corresponding endoscope optics to measure the lifetime based images. We present the adapted system, sensor head and the first results of an application.

AB - A new sensor head and imaging application with planar oxygen optodes is presented. It combines the versatility of the recently presented modular luminescence lifetime imaging system (MOLLI) and the oxygen measuring features of planar optodes to investigate the 2D-distribution of oxygen with a high spatial resolution. The marine sediments are settled by microorganisms. They are characterized by steep gradients of solutes perpendicular to the interface. Oxygen as the most favorable electron acceptor plays an important role in these communities and exhibits steep gradients within distances of 100 μm to a couple of millimeters. Traditionally these gradients are commonly accessed by either oxygen microelectrodes or oxygen microoptodes, that measure single oxygen depth profiles at spatial resolutions in the range of 50-5 μm. As the influences on the metabolism of these organisms are complex, profiles that are measured at one location exhibit a natural heterogeneity. To address this problem by using the potential of planar oxygen optodes first measurements with optodes fixed to an aquarium wall (Glud et al. 1996) based on luminescence intensity measurements have been published. They showed the large amount of information that can be gathered by this method. We further developed this approach by combining the planar optode with the capabilities of imaging fibers that form an endoscope. We developed a periscope type sensor head that can be independently applied in biological samples. It has an overall diameter of 2.5 mm and a calculated pixel resolution of 12 μm. The according measuring system compared to the published system has a different excitation light setup and corresponding endoscope optics to measure the lifetime based images. We present the adapted system, sensor head and the first results of an application.

UR - http://www.scopus.com/inward/record.url?scp=0033346731&partnerID=8YFLogxK

M3 - Conference article

AN - SCOPUS:0033346731

SN - 1605-7422

VL - 3860

SP - 154

EP - 163

JO - Progress in Biomedical Optics and Imaging

JF - Progress in Biomedical Optics and Imaging

T2 - Proceedings of the 1999 Fiber Optics Sensors Technology and Applications

Y2 - 20 September 1999 through 22 September 1999

ER -