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Frequency domain fluorescence lifetime imaging camera.


The pco.flim camera system is the first luminescence decay time microscopy camera using a two tap CMOS image sensor. Synchronized modulation of pixels and stimulated light enables the analysis of decay times in the range of 100 ps to 100 µs. A broad variety of trigger options allows the camera’s integration in versatile fields of applications.

The video below descibes Fluorescence Lifetime Imaging (FLIM) with a focus on frequency domain FLIM with pco.flim. It explains how fluorescence lifetime imaging (FLIM) can be done and describes the benefits of frequency domain FLIM done with a pco.flim camera system.

Frequency Domain FLIM
with pco.flim

Modulated CMOS Camera for Fluorescence Lifetime Microscopy

Widefield frequency-domain fluorescence lifetime imaging microscopy (FDFLIM) is a fast and accurate method to measure the fluorescence lifetime of entire images. However, the complexity and high costs involved in construction of such a system limit the extensive use of this technique. PCO AG recently released the first luminescence lifetime imaging camera based on a high frequency modulated CMOS image sensor, QMFLIM2.

Here we tested and provide operational procedures to calibrate the camera and to improve the accuracy using corrections necessary for image analysis. With its flexible input/output options, we are able to use a modulated laser diode or a 20 MHz pulsed white supercontinuum laser as the light source. The output of the camera consists of a stack of modulated images that can be analyzed by the SimFCS software using the phasor approach. The nonuniform system response across the image sensor must be calibrated at the pixel level. This pixel calibration is crucial and needed for every camera settings, e.g. modulation frequency and exposure time.

A significant dependency of the modulation signal on the intensity was also observed and hence an additional calibration is needed for each pixel depending on the pixel intensity level. These corrections are important not only for the fundamental frequency, but also for the higher harmonics when using the pulsed supercontinuum laser. With these post data acquisition corrections, the PCO CMOS-FLIM camera can be used for various biomedical applications requiring a large frame and high speed acquisition.

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