NIUMAG QMR06-090H-PRO In Vivo Small Animal Body Composition Analyzer (Low-Field NMR)

Overview

The NIUMAG QMR06-090H-PRO is a dedicated low-field nuclear magnetic resonance (LF-NMR) analyzer engineered for non-invasive, quantitative in vivo assessment of body composition in small laboratory animals. Operating at a static magnetic field strength typical of permanent-magnet-based systems (typically 0.05–0.1 T), it exploits the differential transverse relaxation times (T₂) of protons in adipose tissue, lean muscle mass, and free water compartments to discriminate and quantify fat mass, lean body mass, and total body water without ionizing radiation or surgical intervention. Designed specifically for longitudinal preclinical studies, the system enables repeated measurements on conscious, unrestrained animals—preserving physiological integrity and reducing inter-test variability associated with anesthesia or euthanasia. Its compact benchtop architecture integrates a homogeneous permanent magnet, high-sensitivity RF coil assembly, and precision gradient control optimized for rodent-scale samples (mouse to large rat, up to ~500 g).

Key Features

• Truly non-invasive operation: Requires no anesthesia, fasting, sedation, or terminal sacrifice—enabling serial monitoring across disease progression, dietary intervention, or pharmacological treatment timelines.
• Rapid acquisition protocol: Full three-component quantification (fat, lean, free water) completed in ≤180 seconds per subject, supporting high-throughput screening in academic and contract research organization (CRO) settings.
• High reproducibility & precision: Inter-day CVs <3.5% for fat mass and <2.8% for lean mass in standardized mouse cohorts (n=12, C57BL/6J, 20–25 g), validated against chemical carcass analysis (AOAC 992.16) and DEXA reference methods.
• Animal-friendly ergonomic design: Adjustable animal holder with integrated respiratory monitoring port; temperature-controlled bore environment maintains normothermia during scanning (±0.3°C stability over 5 min).
• Robust hardware architecture: Self-shielded NdFeB permanent magnet with active shimming; broadband tunable RF probe (6–12 MHz range); embedded digital signal processor for real-time echo train reconstruction.

Sample Compatibility & Compliance

The QMR06-090H-PRO accommodates live, conscious rodents including C57BL/6, BALB/c, and CD-1 mice (15–35 g), Sprague-Dawley and Wistar rats (100–500 g), and New Zealand White rabbits (up to 2.5 kg). All measurement protocols adhere to the ARRIVE 2.0 guidelines for humane experimental design and reporting. Data output conforms to FAIR principles (Findable, Accessible, Interoperable, Reusable), with metadata tagging compliant with MIAME/MINSEQE extensions for preclinical imaging. While not FDA-cleared as a medical device, the system meets IEC 61000-6-3 (EMC emission) and IEC 61000-6-2 (immunity) standards. Instrument qualification documentation supports GLP-compliant study execution per OECD Principles of Good Laboratory Practice (ENV/MC/CHEM(98)17).

Software & Data Management

Controlled via NIUMAG’s proprietary QMR-Studio v4.2 software suite, the platform delivers intuitive workflow navigation with role-based user access (Operator, Technician, Administrator). Acquisition parameters—including echo time (TE), repetition time (TR), number of echoes, and scan averages—are configurable per protocol template. Raw FID and multi-echo decay data are stored in vendor-neutral HDF5 format with embedded DICOM-SR headers for auditability. Batch processing supports automated T₂ distribution fitting using constrained non-negative least squares (NNLS) algorithms. Integrated reporting modules generate PDF/Excel outputs containing absolute masses (g), relative percentages (%BW), and longitudinal delta trends. Audit trail functionality logs all parameter modifications, user logins, and data exports in accordance with 21 CFR Part 11 requirements when configured with electronic signature modules.

Applications

• Metabolic phenotyping in obesity, diabetes, and NAFLD/NASH models
• Evaluation of anti-obesity therapeutics and nutraceutical interventions
• Longitudinal sarcopenia and cachexia monitoring in aging and cancer models
• Validation of genetic knockouts/knock-ins affecting lipid metabolism or muscle homeostasis
• Preclinical toxicology studies requiring repeated body composition endpoints
• Supporting NIH-funded grants requiring objective, quantitative, and ethically compliant phenotyping metrics

FAQ

Is anesthesia required for scanning?
No. The QMR06-090H-PRO is designed for conscious animal imaging; restraint is minimal and stress-adapted.
Can the system differentiate intramuscular fat from subcutaneous fat?
No. It reports total fat mass, lean mass, and free water as whole-body compartments—not regional or anatomical subcompartments.
What is the minimum sample weight for reliable quantification?
The lower detection limit is 12 g (e.g., post-weaning mice), with optimal accuracy achieved at ≥18 g.
Does the system require liquid helium or cryogens?
No. The permanent magnet operates at ambient temperature with zero cryogen consumption or maintenance.
Is method validation support available for regulatory submissions?
Yes. NIUMAG provides IQ/OQ documentation templates, system suitability test procedures, and technical white papers aligned with USP & ISO 17025 frameworks.