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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Eva Yw Cheung1, Henry Mak1, Yat Fung Shea2

  • 1The University of Hong Kong, Hong Kong, Hong Kong.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 25, 2025
PubMed
Summary
This summary is machine-generated.

This study developed a direct conversion formula for amyloid-beta PET imaging, simplifying results for Alzheimer's disease diagnosis and treatment. The new Centiloid scaling method allows for easier comparison of Aβ PET scans across different studies and tracers.

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Area of Science:

  • Neuroimaging
  • Nuclear Medicine
  • Radiochemistry

Background:

  • Alzheimer's disease (AD) is characterized by amyloid-beta (Aβ) plaques in the brain.
  • Positron Emission Tomography (PET) with 18F-labelled radiotracers quantifies Aβ load.
  • Current methods using relative standard uptake value (SUVr) vary by tracer, complicating comparisons.

Purpose of the Study:

  • To develop a standardized method for quantifying Aβ PET scans.
  • To establish a direct conversion formula from SUVr to Centiloid (CL) scaling.
  • To facilitate inter-tracer comparison and Aβ treatment prescription.

Main Methods:

  • Reproduced PIB-PET image analysis and scaled SUVr to Centiloid (CL).
  • Scaled 18F-Flutemetamol PET SUVr to PIB-PET SUVr using a combined cohort.
  • Correlated local 18F-Flutemetamol PET results and calculated CL directly from GE CortexID software SUVr.

Main Results:

  • Achieved expected calibration with high R-squared values (0.9816 and 1).
  • Established a linear correlation for local SUVr to CortexID SUVr (R2=0.9968).
  • Derived a direct formula for CL calculation: CL=124.58*SUVr(CortexID)-121.16.

Conclusions:

  • Successfully developed a direct conversion formula from SUVr (Cortex ID) to CL.
  • The formula simplifies Aβ PET reporting and facilitates cross-study comparisons.
  • Aims to aid clinicians in image reporting and streamline Aβ treatment prescription.