Biological Tissue Imaging with a Position and Time Sensitive Pixelated Detector

J. Jungmann,Donald F. Smith,L. MacAleese,I. Klinkert,J. Visser,R. Heeren

Published 2012 in Journal of the American Society for Mass Spectrometry

ABSTRACT

We demonstrate the capabilities of a highly parallel, active pixel detector for large-area, mass spectrometric imaging of biological tissue sections. A bare Timepix assembly (512 × 512 pixels) is combined with chevron microchannel plates on an ion microscope matrix-assisted laser desorption time-of-flight mass spectrometer (MALDI TOF-MS). The detector assembly registers position- and time-resolved images of multiple m/z species in every measurement frame. We prove the applicability of the detection system to biomolecular mass spectrometry imaging on biologically relevant samples by mass-resolved images from Timepix measurements of a peptide–grid benchmark sample and mouse testis tissue slices. Mass-spectral and localization information of analytes at physiologic concentrations are measured in MALDI-TOF-MS imaging experiments. We show a high spatial resolution (pixel size down to 740 × 740 nm2 on the sample surface) and a spatial resolving power of 6 μm with a microscope mode laser field of view of 100–335 μm. Automated, large-area imaging is demonstrated and the Timepix’ potential for fast, large-area image acquisition is highlighted.

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