What type of study is this?

This is a Quantitative Study study.

September 17, 2025

A Practical Approach for Quantification of Stress/Rest Myocardial Blood Volume Reserve Using Free-breathing Ferumoxytol-enhanced MRI at 0.55T

Key Points

The proposed approach estimates myocardial blood volume reserve (MBVR) as a more accurate physiological biomarker than conventional T1 reactivity for detecting ischemia.
Proposed methodology provided MBVR estimates consistent with existing literature, showing that it can accurately identify ischemic territories.
Using beat-to-beat T1 mapping during ferumoxytol infusion helps correct conventional methods, leading to better assessment of blood volume reserves.
The approach modifies existing protocols for ferumoxytol-enhanced MRI, making the biomarker more accessible for clinical use.

Abstract

Motivation: Rest to stress myocardial blood volume reserve (MBVR) is an important physiological biomarker to detect ischemia but using T1 reactivity as its surrogate has limitations (such as dose dependence) for ferumoxytol-enhanced cardiac MRI. Goal(s): We propose a practical approach to estimate MBVR as a dose-independent biomarker. Approach: We perform beat-to-beat T1 mapping during ferumoxytol infusion to estimate extravascular T1 at blood/myocardium equilibrium, and correct the conventional T1 reactivity for it to estimate MBVR. Results: Proposed approach provided MBVR estimates consistent with the literature. MBVR, as a physiological biomarker unlike T1 reactivity, was more accurate in detecting ischemic territories than T1 reactivity. Impact: Proposed approach to estimate myocardial blood volume reserve appends a minor modification to conventional ferumoxytol-enhanced T1 reactivity protocol, and enables estimation of a dose-independent physiological biomarker to detect ischemia. This helps standardizing normal and abnormal values in clinical scenarios.

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