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Related Experiment Videos

Rodent brain imaging with SPECT/CT.

Youngho Seo1, Dong-Wei Gao, Bruce H Hasegawa

  • 1Department of Radiology, University of California, San Francisco, California 94143, USA. youngho.seo@radiology.ucsf.edu

Medical Physics
|May 16, 2007
PubMed
Summary
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This study demonstrates in vivo imaging of cerebral blood flow deficits in rat stroke models using small animal single photon emission computed tomography (SPECT). Pinhole SPECT effectively identified reduced blood flow in middle cerebral artery occlusion (MCAO) models.

Area of Science:

  • Biomedical Imaging
  • Radiochemistry
  • Neurology

Background:

  • Stroke is a leading cause of disability, necessitating advanced imaging techniques for research.
  • Accurate in vivo assessment of cerebral blood flow is crucial for understanding stroke pathophysiology and evaluating treatments.
  • Small animal models, like the middle cerebral artery occlusion (MCAO) rat model, are vital for preclinical stroke research.

Purpose of the Study:

  • To evaluate the efficacy of a dedicated small animal single photon emission computed tomography (SPECT) system for imaging cerebral blood flow deficits in a rat stroke model.
  • To validate in vivo SPECT findings with ex vivo methods.

Main Methods:

  • Development of an MCAO rat model for ischemic stroke.
  • In vivo dynamic planar and pinhole SPECT/CT imaging of cerebral blood flow using 99mTc-exametazime.

Related Experiment Videos

  • Ex vivo triphenyltetrazolium chloride (TTC) staining for infarct verification.
  • Ex vivo autoradiography for confirmation of SPECT findings.

    • Main Results:

    • TTC staining confirmed the presence of sizable infarcts in MCAO rat brains.
    • In vivo SPECT imaging successfully visualized cerebral blood flow deficits in the MCAO model.
    • Ex vivo autoradiography corroborated the in vivo SPECT results, confirming the accuracy of the imaging method.
    • 99mTc-exametazime uptake remained stable for at least 9 minutes, suitable for dynamic imaging.

    Conclusions:

    • Pinhole SPECT imaging is a capable method for in vivo assessment of cerebral blood flow deficits in MCAO rat models.
    • This technique provides valuable insights into stroke pathophysiology and can aid in the evaluation of potential therapeutic interventions.