IVM-M In Vivo Two-Photon Microscope by IVIM Technology

Overview

The IVM-M In Vivo Two-Photon Microscope is a high-performance optical imaging platform engineered for longitudinal, high-resolution intravital microscopy in awake, freely moving, or head-fixed small animal models. Leveraging ultrafast femtosecond laser excitation (690–1050 nm tunable range) and nonlinear two-photon absorption physics, the system enables deep-tissue fluorescence imaging with subcellular resolution and minimized phototoxicity. Its core optical architecture is based on Coherent Chameleon Discovery lasers coupled with a galvanometric mirror–rotating polygon scanner hybrid design—ensuring diffraction-limited excitation uniformity across the entire field of view (FOV), without central signal attenuation or peripheral photobleaching artifacts. Penetration depth reaches up to 1000 µm in scattering biological tissue (e.g., cortical layers, liver lobules, lymph node parenchyma), making it suitable for structural and functional interrogation of dynamic cellular processes within native physiological environments.

Key Features

• Hybrid scanning engine: High-speed rotating polygon mirror + precision galvo mirrors enabling stable 100 fps acquisition at 512 × 512 pixel resolution—optimized for real-time calcium dynamics, blood flow kinetics, and immune cell trafficking.
• Uniform excitation illumination: Engineered optical path ensures consistent photon flux density across full FOV—preserving quantitative fluorescence intensity linearity from center to periphery.
• Integrated motion artifact compensation: GPU-accelerated parallel processing pipeline performs real-time rigid-body motion correction during acquisition; compatible with both slow-moving abdominal organs (liver, kidney, spleen) and rapidly contracting thoracic tissues (heart, lung).
• Multi-channel confocal module: Configurable 4-channel detection (selectable from 16 excitation wavelengths: 405–785 nm), supporting simultaneous multi-fluorophore imaging under two-photon or hybrid two-/single-photon excitation modes.
• Dedicated in vivo optics: Water-immersion objectives (e.g., 16×/0.8 NA, 25×/1.0 NA) with long working distance and thermal stabilization for prolonged imaging sessions (>4 hours) without drift-induced focus loss.

Sample Compatibility & Compliance

The IVM-M is validated for use with murine models including C57BL/6, BALB/c, NSG, and transgenic strains expressing fluorescent reporters (e.g., Thy1-YFP, CX3CR1-GFP, LysM-eGFP). It supports chronic cranial window, spinal cord window, dorsal skinfold chamber, and abdominal imaging windows—compatible with standard surgical protocols compliant with NIH Guide for Care and Use of Laboratory Animals and EU Directive 2010/63/EU. All hardware and software components meet CE marking requirements for Class I medical device accessories and are designed to support GLP-compliant experimental workflows. Data provenance, user access logs, and audit trails can be enabled via optional FDA 21 CFR Part 11–compliant software modules.

Software & Data Management

Acquisition and analysis are managed through IVIM’s proprietary IVOS (In Vivo Optical Suite) v4.x software suite, built on a modular Qt/C++ framework with Python API extension support. IVOS provides synchronized hardware control (laser power, PMT gain, z-stack stepping, stage positioning), real-time motion correction preview, and batch-processing pipelines for deconvolution, drift correction, and ROI-based fluorescence quantification. Export formats include TIFF (OME-TIFF metadata compliant), HDF5, and NIfTI for interoperability with Imaris, FIJI/ImageJ, MATLAB, and custom deep-learning frameworks (e.g., Cellpose, DeepLabCut). Raw data storage adheres to FAIR principles (Findable, Accessible, Interoperable, Reusable) and integrates with institutional LIMS or ELN systems via RESTful API.

Applications

The IVM-M serves as a foundational tool for mechanistic studies across immunology, neuroscience, oncology, and regenerative medicine. Validated applications include: real-time tracking of T-cell motility and antigen encounter in lymph nodes; neuronal dendritic spine plasticity during learning paradigms; metastatic seeding dynamics of fluorescently labeled tumor cells in lung or liver microvasculature; macrophage–endothelial interactions during ischemia-reperfusion injury; stem cell engraftment and differentiation in bone marrow niches; and longitudinal monitoring of vascular leakage, angiogenesis, and fibroblast activation in chronic inflammation models. Its compatibility with optogenetic actuators (e.g., ChR2, iC++), biosensors (GCaMP, jRGECO), and genetically encoded voltage indicators further extends its utility in causal circuit interrogation.

FAQ

What is the maximum recommended imaging duration for awake mouse brain imaging?
Typical sessions range from 30 minutes to 2 hours depending on behavioral stability and thermal regulation; extended sessions (>4 h) require integrated temperature and respiration monitoring modules.
Is the system compatible with third-party electrophysiology rigs?
Yes—IVOS supports TTL synchronization inputs/outputs and analog voltage triggers for concurrent patch-clamp, EEG, or fiber photometry integration.
Can the IVM-M perform spectral unmixing across multiple fluorophores?
Spectral detection is supported via optional 32-channel GaAsP PMT array and linear unmixing algorithms; standard configuration uses bandpass-filtered PMTs.
Does the system support automated z-stack acquisition during motion correction?
Yes—GPU-accelerated motion correction operates concurrently with motorized objective z-stepping, preserving volumetric fidelity in dynamic tissue.
What service and calibration support is included post-installation?
IVIM provides on-site installation, laser alignment certification, annual preventive maintenance, and traceable NIST-calibrated power meter verification reports.