Momentum MPI Small Animal In Vivo Imaging System

Overview

The Momentum MPI Small Animal In Vivo Imaging System is a preclinical tomographic imaging platform based on Magnetic Particle Imaging (MPI) — a quantitative, radiation-free molecular imaging modality that directly detects the non-linear magnetization response of superparamagnetic iron oxide nanoparticles (SPIOs) under time-varying magnetic fields. Unlike optical, PET, or MRI-based techniques, MPI does not rely on endogenous contrast or ionizing radiation; instead, it measures the unique harmonic signature generated by SPIO tracers in dynamically controlled selection and drive field gradients. This principle enables absolute quantification of tracer concentration with zero signal attenuation at depth, making Momentum uniquely suited for longitudinal, high-sensitivity tracking of cellular and nanotherapeutic agents in murine models.

Key Features

• True 3D tomographic acquisition with isotropic spatial resolution down to 100 µm across a 6 cm × 6 cm × 12 cm FOV
• Sub-second volumetric scan capability (10 s per full 3D dataset), enabling dynamic perfusion and clearance studies
• Quantitative linear response over >4 orders of magnitude tracer concentration (ng Fe/mL to µg Fe/mL)
• No ionizing radiation or radioactive isotopes — fully compliant with ALARA principles and long-term serial imaging protocols
• Clinically translatable workflow using FDA-cleared or EMA-approved SPIO formulations (e.g., Ferumoxytol, Resovist)
• Robust gradient architecture delivering stable selection field gradients up to 5.3 mT/m and high-frequency drive fields (25 kHz range)
• Integrated animal handling system with temperature-controlled stage, respiratory gating interface, and anesthesia compatibility

Sample Compatibility & Compliance

The Momentum system is optimized for standard laboratory rodents (mice, rats) and supports both intravenous and localized (e.g., intratumoral, intra-articular) SPIO administration. All imaging protocols adhere to internationally recognized preclinical standards, including AAALAC-accredited housing requirements and IACUC-compliant dosing guidelines. The use of clinically approved SPIO agents ensures regulatory alignment with translational development pathways — particularly relevant for IND-enabling studies targeting renal-impaired patient populations. Data acquisition and storage conform to GLP-compliant metadata tagging (DICOM-MPI draft standard), supporting audit readiness for FDA 21 CFR Part 11–governed workflows.

Software & Data Management

Acquisition and reconstruction are managed via MPI Studio v4.x — a validated, modular software suite featuring real-time preview, multi-parametric reconstruction (Lissajous trajectory correction, system matrix deconvolution), and voxel-wise quantitative mapping of SPIO concentration (µg Fe/g tissue). Export formats include NIfTI-1, DICOM-SR, and HDF5, facilitating integration with MATLAB, Python (via mpi-tools), and commercial image analysis platforms (e.g., Amira, Imaris). Audit trails log all user actions, parameter changes, and calibration events; software validation documentation is available upon request for GxP environments.

Applications

• Longitudinal stem cell and immune cell trafficking (e.g., T-cell, macrophage, NK-cell homing)
• Quantitative tumor microenvironment profiling — including angiogenesis, vascular permeability, and immune infiltration dynamics
• Real-time monitoring of magnetic nanoparticle–mediated hyperthermia and targeted drug release
• Preclinical evaluation of novel SPIO-based contrast agents and theranostic constructs
• Functional cardiovascular imaging: myocardial perfusion, infarct zone delineation, and aortic plaque burden assessment
• Neuroinflammatory mapping in models of MS, Alzheimer’s disease, and stroke
• Multimodal correlation with MRI, CT, or bioluminescence data via co-registration tools

FAQ

Is the Momentum system compatible with existing SPIO tracers used in human clinical trials?

Yes — the system is calibrated for clinical-grade SPIOs such as Ferumoxytol (FDA-approved for iron replacement) and Resovist (EMA-approved), enabling direct bench-to-bedside tracer validation.
Does MPI require radioactive shielding or special facility certification?

No — MPI operates without ionizing radiation or radioisotopes; installation requires only standard electromagnetic compatibility (EMC) compliance and no dedicated hot lab infrastructure.
Can MPI distinguish between free SPIO and SPIO internalized in cells?

Yes — MPI signal amplitude and relaxation behavior correlate with particle clustering state and local microenvironment, allowing indirect inference of cellular uptake and lysosomal sequestration when combined with kinetic modeling.
What level of technical support and service coverage is provided?

Comprehensive support includes on-site installation qualification (IQ), operational qualification (OQ), preventive maintenance contracts, and remote diagnostics via secure TLS-encrypted connection.