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Related Experiment Video

Updated: May 9, 2026

Induction of Diffuse Axonal Brain Injury in Rats Based on Rotational Acceleration
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In Vivo Brain Deformation in a Sheep Model of Rapid Head Rotation.

Charlie Cenin Magarey1, Mark Plummer2, Peter Alec Cripton3

  • 1School of Electrical and Mechanical Engineering, The University of Adelaide, Adelaide, SA, Australia.

Annals of Biomedical Engineering
|May 7, 2026
PubMed
Summary

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This summary is machine-generated.

This study demonstrates sonomicrometry can reliably measure in vivo brain deformation during rapid head rotation in sheep. These findings advance traumatic brain injury (TBI) research and computational modeling for injury prevention.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Medical Imaging

Background:

  • Understanding traumatic brain injury (TBI) mechanics requires precise measurements of brain deformation during head impacts.
  • Current computational models for TBI risk assessment need validation with in vivo data.
  • Synchronous head kinematics and brain deformation data are crucial for advancing TBI research.

Purpose of the Study:

  • To establish a repeatable rapid rotation model of the in vivo sheep head.
  • To evaluate the sonomicrometry technique for measuring multi-point brain displacement.
  • To quantify in vivo brain deformation in response to rapid rotational acceleration.

Main Methods:

  • Implanted sonomicrometry transceiver arrays in sheep brains and attached them to the skull.
Keywords:
Brain deformationFinite element validationLarge animalSonomicrometryTraumatic brain injury

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  • Induced rapid sagittal plane head rotation using a non-impact apparatus.
  • Utilized CT imaging and sonomicrometry to track brain displacement and assess repeatability.

    • Main Results:

    • Successfully tracked up to 11 brain transceivers per test during rapid head rotation (peak acceleration 38.56 krad/s², peak velocity 30.43 rad/s).
    • Achieved excellent repeatability (CORA score 0.99) for in vivo brain displacement measurements.
    • Observed brain displacements up to 2.47 mm and strains up to 18%, with decaying sinusoidal deformation and tension-compression waves.

    Conclusions:

    • Sonomicrometry is a reliable in vivo method for measuring brain deformation.
    • The study provides valuable data for validating computational models of TBI.
    • This research contributes to a better understanding of head injury mechanics.