# Reproducibility of 18F-Sodium Fluoride Positron Emission Tomography for Assessing Microcalcification in Coronary Arterial and Thoracic Aortic Atherosclerosis: Is the Signal below the Resolution of PET?

## TL;DR

This paper reviews the use of 18F-sodium fluoride PET/CT for detecting early atherosclerosis by measuring microcalcification in coronary and thoracic arteries.

## Contribution

The paper emphasizes the need for standardized quantification methods to improve reproducibility in 18F-NaF PET/CT imaging.

## Key findings

- 18F-NaF PET/CT can detect subclinical microcalcification in coronary and thoracic aortic atherosclerosis.
- Global assessment of 18F-NaF uptake is more reliable than focal assessment due to PET's limited spatial resolution.
- Standardized quantification methods could enhance the accuracy and reproducibility of 18F-NaF PET/CT results.

## Abstract

The rising prevalence of atherosclerosis has prompted the development of novel diagnostic methods capable of identifying early-stage disease when therapeutic interventions may be most effective. 18F-sodium fluoride (NaF) positron emission tomography/computed tomography (PET/CT) is a molecular imaging technique that can quantify subclinical microcalcification in arterial plaque. The focus of this review article is to discuss the utility of 18F-NaF PET/CT in assessing atherosclerotic disease of major susceptible blood vessels, particularly the coronary arteries and thoracic aorta.

18F-NaF uptake observed on PET imaging demonstrates promising potential as a marker of atherosclerotic burden in individual coronary arteries, whole heart segmentations, and the thoracic aorta. Global versus focal assessment of 18F-NaF uptake in small arteries is a significant source of methodological heterogeneity among studies.

The accuracy and reproducibility of 18F-NaF PET/CT may be improved by standardized quantification methods in light of the limited spatial resolution of PET, particularly through the use of techniques to evaluate global atherosclerotic burden.