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Related Concept Videos

Positron Emission Tomography01:29

Positron Emission Tomography

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Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
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Related Experiment Video

Updated: Jul 2, 2025

A Dual Tracer PET-MRI Protocol for the Quantitative Measure of Regional Brain Energy Substrates Uptake in the Rat
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Partial volume correction in longitudinal tau PET studies: is it really needed?

Alejandro Costoya-Sánchez1, Alexis Moscoso2, Tomás Sobrino3

  • 1Molecular Imaging Group. Center for Research in Molecular Medicine and Chronic Diseases (CIMUS), University of Santiago de Compostela (USC), Campus Vida, Santiago de Compostela, Av. Barcelona SN, 15782, Santiago de Compostela, Galicia, Spain; Nuclear Medicine Department and Molecular Imaging Group, Instituto de Investigación Sanitaria de Santiago de Compostela, Travesía da Choupana s/n, Santiago de Compostela, Spain.

Neuroimage
|February 17, 2024
PubMed
Summary

Partial volume correction (PVC) in longitudinal [18F]flortaucipir (FTP) tau PET imaging reduces off-target binding effects. Voxel-wise PVC techniques, particularly RBV, improve group difference detection and prediction of cognitive decline.

Keywords:
LongitudinalOff-target binding, SUVRPVCTau PET

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Area of Science:

  • Neuroimaging
  • Nuclear Medicine
  • Alzheimer's Disease Research

Background:

  • Non-specific binding in off-target regions affects [18F]flortaucipir (FTP) tau PET quantification.
  • Partial volume correction (PVC) methods can mitigate these effects but may introduce noise.
  • The impact of PVC on longitudinal FTP studies requires further investigation.

Purpose of the Study:

  • To evaluate the performance of common PVC techniques for longitudinal FTP imaging.
  • To assess the influence of PVC on the quantification of FTP tau PET.
  • To determine the effectiveness of PVC in detecting longitudinal changes and predicting outcomes.

Main Methods:

  • Utilized data from 247 Alzheimer's Disease Neuroimaging Initiative participants with longitudinal FTP-PET, amyloid-beta PET, and MRI.
  • Applied Meltzer’s, region-based voxel-wise (RBV), and iterative Yang (iY) PVC techniques to FTP-PET scans.
  • Analyzed longitudinal FTP SUVR rates, off-target binding correlations, group differences (A-/A+, CU/CI), and prediction of atrophy and cognitive decline.

Main Results:

  • Hemispheric white matter and CSF showed the highest correlation with longitudinal FTP SUVR rates; voxel-wise PVC minimized this.
  • RBV PVC demonstrated the best performance in reducing off-target binding correlations.
  • PVC enhanced group differences between cognitively unimpaired and impaired individuals and strengthened the prediction of longitudinal brain atrophy and cognitive decline.

Conclusions:

  • Longitudinal FTP SUVR quantification is influenced by off-target regions, notably white matter and CSF.
  • Voxel-wise PVC techniques effectively reduce these off-target effects.
  • PVC offers a modest but significant benefit for longitudinal group studies, impacting sample size and analysis methodology.