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Related Experiment Video

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Small animal DXA instrument comparison and validation.

Jennifer C Coulombe1, David E Maridas2, Jarred L Chow3

  • 1Center for Advanced Orthopedic Studies, Department of Orthopedic Surgery, Beth Israel Deaconess Medical Center, Boston, MA, United States of America; Harvard Medical School, Boston, MA, United States of America.

Bone
|October 1, 2023
PubMed
Summary
This summary is machine-generated.

New rodent dual-energy X-ray absorptiometry (DXA) devices, InAlyzer and iNSiGHT, offer excellent precision for bone and body composition analysis. The InAlyzer shows higher accuracy for bone mineral content, making it preferable for musculoskeletal studies.

Keywords:
BMCBMDBody compositionDXAFat massInAlyzerLean massMurine modelNMRPIXImusValidationiNSightmicroCT

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Area of Science:

  • Biomedical Engineering
  • Osteology
  • Animal Models

Background:

  • Peripheral dual-energy X-ray absorptiometry (DXA) is crucial for rodent bone and body composition analysis.
  • New DXA devices (InAlyzer, iNSiGHT) have emerged, necessitating performance evaluation.
  • Established PIXImus device performance serves as a benchmark.

Purpose of the Study:

  • To compare the accuracy and precision of InAlyzer and iNSiGHT DXA devices against the PIXImus system.
  • To assess the performance of new DXA devices for rodent bone mineral content, bone mineral density, and body composition measurements.
  • To validate DXA body composition with nuclear magnetic resonance (NMR) and bone mineral content with micro-computed tomography (microCT).

Main Methods:

  • 18 male C57Bl/6J mice (8, 14, 24 weeks old) were scanned using InAlyzer, iNSiGHT, and PIXImus DXA devices.
  • Total body bone mineral content (BMC), bone mineral density (BMD), lean mass, and fat mass were measured.
  • Femur BMC was compared to microCT, and body composition was compared to NMR.

Main Results:

  • InAlyzer and iNSiGHT showed strong correlation with PIXImus for total body BMD (R²=0.83, 0.82) but were ~25% higher.
  • InAlyzer demonstrated strong association for total body BMC (R²=0.86) and femur BMC with microCT, while iNSiGHT showed weak correlation.
  • Both devices exhibited excellent precision (0.39-3.2%) and strong correlations for fat mass (R²=0.91-0.97) and lean mass (R²=0.81-0.76).

Conclusions:

  • InAlyzer and iNSiGHT are satisfactory replacements for the discontinued PIXImus system, offering faster scan times and excellent precision.
  • The InAlyzer may be preferable for studies focusing on musculoskeletal changes due to its superior accuracy in bone and body composition measures.
  • Both devices provide reliable body composition data, with InAlyzer offering enhanced accuracy for bone-related research.