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CT-based coregistration improves brain dimension estimates in rodent micro-PET/CT studies. This method enhances nondisplaceable binding potential (BPND) accuracy, crucial for brain disorder research.

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Area of Science:

  • Neuroscience
  • Medical Imaging
  • Radiochemistry

Background:

  • Combined micro-PET/CT scanners are vital for studying rodent brain disorders.
  • PET-based coregistration is standard but can introduce inaccuracies in dimensional estimates.
  • Accurate brain dimensions are essential for reliable quantification of tracer binding potentials.

Purpose of the Study:

  • To evaluate if CT-based coregistration enhances brain dimension accuracy in rodent PET studies.
  • To determine the impact of improved dimensions on nondisplaceable binding potential (BPND) estimations.
  • To compare CT-based coregistration with conventional PET-based methods.

Main Methods:

  • PET and CT scans were acquired from CD-1 mice using [18F]FPEB, a tracer for mGluR5.
  • A novel PET/CT (PTCT) approach customized tracer-specific volumes using CT-derived scaling factors.
  • Conventional PET-based coregistration (9 or 12 parameters) was used for comparison.

Main Results:

  • PET-based methods underestimated scaling factors, leading to up to 20% radioactivity overestimation in the cerebellum.
  • BPND estimates were significantly underestimated (down to -50%) in target regions with PET-based methods.
  • CT-based scaling factors from PTCT showed better skull alignment than PET-based factors from PT9.

Conclusions:

  • Conventional PET-based coregistration can bias BPND estimates due to brain dimension errors, especially when using the cerebellum as a reference region.
  • The proposed CT-based coregistration (PTCT) offers quantitative improvements for rodent brain studies using micro-PET/CT.
  • Accurate coregistration is critical for reliable quantification in neuroimaging research.