Live Cell Imaging Microscopes

Live-Cell Imaging FAQs

What is live-cell imaging?

Live-cell imaging is a microscopy technique that allows researchers to observe and record living cells in real time over extended periods. It is used to study dynamic cellular processes such as cell division, migration, intracellular signaling, and interactions with their environment. Live-cell imaging systems must maintain stable conditions, such as temperature, humidity, and CO₂ levels, to keep cells alive and healthy throughout the experiment.

Advanced imaging technologies and live-cell imaging software are also used to minimize phototoxicity and photobleaching while capturing high-resolution, time-lapse images. This technique is essential for understanding the behavior and function of cells in their natural state, supporting discoveries in fields like cell biology, neuroscience, and cancer research.

What is the difference between live-cell imaging and fixed-cell imaging?

Live-cell imaging and fixed-cell imaging are both essential techniques in cell biology, but they serve different purposes and offer distinct advantages.

• Live-cell imaging allows researchers to observe living cells in real time, making it possible to study dynamic biological processes as they happen, such as cell migration, division, intracellular trafficking, and signal transduction. Because the cells remain alive, this technique requires careful environmental control (e.g., temperature, CO₂ levels, humidity) to maintain cell health, as well as imaging systems that minimize phototoxicity and photobleaching.

• Fixed-cell imaging, on the other hand, involves chemically preserving cells at a specific point in time using fixatives. This process halts all cellular activity, enabling researchers to use more intensive staining methods and higher resolution imaging without concern for cell viability. Fixed-cell imaging is ideal for detailed structural analysis, such as examining organelles, protein localization, or cellular architecture, but it cannot capture dynamic processes or changes over time.

What are the advantages of live-cell imaging?

Live-cell imaging offers several key advantages. It allows researchers to observe cellular processes in real time, providing dynamic insights into cell behavior, interactions, and responses to stimuli. This technique enables time-lapse studies of events like cell division, migration, and intracellular transport, which are impossible with static imaging methods. It also supports more accurate modeling of biological systems by capturing cells in their natural, living state.

How does live-cell imaging work?

Live-cell imaging works by using advanced microscopy techniques to capture images of living cells over time, often through time-lapse recording. Cells are placed in a controlled environment on the microscope stage, where temperature, humidity, and CO₂ levels are carefully maintained to keep them alive and healthy. Specialized imaging systems, such as fluorescence, confocal, or TIRF microscopy, are used to visualize specific cellular components or processes. Software coordinates the imaging, allowing researchers to automate data collection and precisely control focus, illumination, and timing. This setup enables the continuous observation of dynamic cellular activity in real time.

What types of microscopes are used for live-cell imaging?

Live-cell imaging can be performed with various microscope types, depending on the sample, imaging depth, resolution requirements, and experimental duration. Options include fluorescence microscopes, inverted microscopes, and spinning disk confocal systems. Inverted microscope configurations are often preferred because they support cell culture vessels such as dishes, flasks, and multi-well plates.

For routine observation and imaging, the APEXVIEW™ APX100 benchtop fluorescence microscope supports efficient live-cell workflows. For more advanced applications, the IXplore™ IX85 inverted microscope platform is a fully modular solution for live-cell imaging and dynamic processes. With an industry-leading field number (FN) of 26.5 mm plus end-to-end imaging features, the IXplore IX85 helps researchers capture more at once while dramatically reducing acquisition times.

How do you keep cells alive during live-cell imaging?

To help keep cells alive during live-cell imaging, the microscope system must maintain stable environmental conditions that support normal cell health. This typically includes controlling temperature, CO₂ concentration, humidity, and, when needed, oxygen levels. The imaging setup should also accommodate appropriate culture vessels and help reduce evaporation during longer experiments.

Stable focus, low phototoxicity, and gentle illumination are also important. Environmental control accessories, incubation systems, and optimized imaging software help maintain consistent conditions while images are captured over minutes, hours, or days.

What is phototoxicity, and how can it be minimized?

Phototoxicity is cell damage caused by light exposure during imaging, especially during fluorescence microscopy. Excessive excitation light can stress cells, alter their behavior, or reduce cell viability, which can impact experimental results.

Phototoxicity can be minimized by using lower illumination intensity, shorter exposure times, more sensitive cameras or detectors, and imaging methods that reduce unnecessary light exposure. Researchers can also optimize fluorophore selection, increase the interval between time points, limit the number of channels, and use software tools that support efficient image acquisition. When appropriate, label-free imaging methods can further reduce light-related stress on living cells.

Which live-cell imaging system is right for my application?

The right live-cell imaging system depends on your sample type, required resolution, imaging speed, throughput, and experimental duration. For routine fluorescence imaging in core labs, a benchtop fluorescence microscope supports easy operation for users of all levels. For long-term time-lapse studies, an inverted live-cell imaging microscope with environmental control and focus stability is often recommended.

For fast intracellular dynamics or thicker samples, a spinning disk confocal microscope system can help balance optical sectioning, speed, and cell viability. If your applications require higher resolution, a super-resolution spinning disk system can provide the finer details of ultra-small cellular dynamics. For automated assays, multi-well plates, and quantitative analysis, a high-content screening station supports high-throughput live-cell workflows.

Can you image live cells without fluorescent labels?

Live cells can be imaged without fluorescent labels using label-free techniques such as phase contrast, differential interference contrast, relief contrast, or other transmitted-light methods. These approaches are useful for monitoring cell morphology, confluency, migration, proliferation, and general cell health, without introducing fluorescent probes.

Label-free imaging is often useful for long-term studies because it reduces phototoxicity and avoids potential changes caused by labeling. Fluorescence imaging may be preferred when researchers need to visualize specific proteins, organelles, signaling events, or molecular interactions.

What is time-lapse imaging, and how long can you image live cells?

Time-lapse imaging captures a sequence of images at defined intervals to show how living cells change over time. It is commonly used to study cell division, migration, differentiation, intracellular transport, wound healing, organoid growth, and responses to treatments.

The length of a live-cell time-lapse experiment depends on the cell type, imaging conditions, sampling interval, illumination dose, and environmental stability. Some experiments last minutes or hours, while others can continue for days when temperature, CO₂, humidity, focus, and illumination are carefully controlled. For long-term imaging, the goal is to collect enough data to answer biological questions while minimizing stress to the cells.

Can live-cell imaging be automated or used for high-content screening?

Live-cell imaging can be automated for time-lapse experiments, multi-position imaging, Z-stack acquisition, multi-well plate imaging, and quantitative image analysis. Automation helps improve consistency, reduce manual operation, and capture dynamic events across multiple samples or conditions.

For high-content screening, automated live-cell imaging systems can acquire and analyze large image datasets from multi-well plates. The scanR high-content screening station supports automated image acquisition and analysis for biological samples, making it suitable for assay development, live-cell analysis, and quantitative screening workflows.

What software is used for live-cell imaging?

Evident’s cellSens™ software supports live-cell imaging workflows ranging from simple image capture to advanced multidimensional experiments. Depending on the configuration, cellSens software can support time-lapse acquisition, 5D imaging, object measurement, confluency analysis, tracking, deconvolution, and AI-powered analysis for applications such as cell counting and label-free nuclei detection.