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Related Concept Videos

Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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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:
Troponins
Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers

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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.
These markers indicate stress or strain on the heart muscle:
Natriuretic Peptides (BNP)
Cardiac myocytes produce these hormones in response to ventricular stretching...
511

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Related Experiment Video

Updated: Jan 7, 2026

Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Nolan K Meyer1, Robert I Reid1, Michael G Kamykowski1

  • 1Mayo Clinic, Rochester, MN, USA.

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

Standardizing diffusion MRI protocols minimizes scanner differences, reducing the need for data harmonization in multi-site aging and dementia studies. This ensures more reliable biomarker analysis across different research sites.

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Area of Science:

  • Neuroimaging
  • Biomarkers
  • Aging and Dementia Research

Background:

  • Diffusion MRI (dMRI) is crucial for aging and dementia biomarkers in multi-center studies.
  • Inter-scanner variability (vendor, hardware, algorithms) can introduce systematic differences in dMRI measures.
  • Harmonization is often needed but may reduce data sensitivity to physiological factors.

Purpose of the Study:

  • To test if protocol standardization minimizes machine-origin differences in dMRI measures.
  • To evaluate if standardization obviates the need for post-acquisition harmonization.
  • To compare DTI and NODDI measures regarding site sensitivity.

Main Methods:

  • Analyzed crossover data (80 participants) on GE and Siemens scanners with varying protocols.
  • Analyzed longitudinal Mayo Clinic Study of Aging (MCSA) data from two sites using standardized protocols.
  • Compared dMRI metrics (MD, FA, NODDI) using histogram densities and genu of corpus callosum (GCC) measures.

Main Results:

  • Protocol adjustments (resampling, shared b-shells) reduced distributional differences in crossover data.
  • Standardized MCSA data showed aligned dMRI densities with no significant GCC-FA or GCC-MD differences between sites.
  • NODDI measures exhibited greater site-related discordance than DTI measures.

Conclusions:

  • Protocol and processing standardization effectively minimize machine-origin differences in dMRI.
  • Standardization reduces the need for post-acquisition harmonization, preserving data sensitivity.
  • DTI metrics are less sensitive to site differences than NODDI metrics.