Dr. Ir. Lennard Voortman

Dr. Ir. Lennard Voortman

I have a background in applied physics (TU Delft), where I focused on image analysis in the group of Lucas van Vliet. My PhD research involved image formation in cryo-electron tomography, which was a joint collaboration between Bram Koster (LUMC) and Lucas van Vliet (TU Delft). The project was part of an industrial partnership programme with FEI Company (now part of Thermo Fisher). After finishing my PhD thesis I started working as application specialist at Delmic, a start-up company in Delft that produces integrated correlative light and electron microscopes. During my time at Delmic, I was closely collaborating with the group of Pieter Kruit and Jacob Hoogenboom (TU Delft), where I worked on projects involving electron-beam induced super resolution and multi-beam SEM imaging.

At the end of 2016 I started at the Leiden University Medical Center as the head of the light microscopy facility. Here I am working on maintaining and improving the scientific impact generated and facilitated by the microscopy facility, as well as providing support with image analysis and quantification.


  • Quantifying resolution limiting factors in subtomogram averaged cryo-electron tomography using simulations

    Voortman LM, Vulović M, Maletta M, Voigt A, Franken EM, Simonetti A, Peters PJ, van Vliet LJ, Rieger B

    J Struct Biol. 2014. DOI: 10.1016/j.jsb.2014.06.007

  • When to use the projection assumption and the weak-phase object approximation in phase contrast cryo-EM

    Vulović M, Voortman LM, van Vliet LJ, Rieger B.

    Ultramicroscopy. 2014. DOI: 10.1016/j.ultramic.2013.08.002

  • Automated sub-5 nm image registration in integrated correlative fluorescence and electron microscopy using cathodoluminescence pointers

    Haring MT, Liv N, Zonnevylle AC, Narvaez AC, Voortman LM, Kruit P, Hoogenboom JP

    Sci Rep. 2017. DOI: 10.1038/srep43621

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