What type of study is this?

This is a Quantitative Study study.

September 17, 2025

A comparative analysis of single-echo and multi-echo EPI sequences for task-fMRI

Key Points

Multi-echo fMRI enhanced BOLD sensitivity compared to single-echo data, supporting previous studies.
Optimized single-echo acquisition results did not confirm superior performance over multi-echo, contrary to expectations.
Three datasets were analyzed (Multi-Echo, Optimized Single-Echo, Echo-2) for performance metrics and reliability.
Direct evaluation of multi-echo compared to optimized single-echo provides insights on acquisition approaches.

Abstract

Motivation: Multi-Echo (ME) fMRI technique during task has shown to enhance BOLD sensitivity when compared with single-echo data derived from ME itself (Echo-2). Goal(s): Investigate the perks of a ME protocol with a comprehensive comparison with an Optimized Single-Echo (OSE) acquisition (i.e. not with data derived from ME itself). Approach: We characterized 3 datasets (ME, OSE, Echo-2) computing single-subject and group-level analyses, performance metrics and fMRI reliability. Results: ME and OSE showed better results than Echo-2 confirming previous studies, but in a comparison of optimized sequences, the superior performance of ME is not confirmed. Impact: A comprehensive comparison of Multi-Echo fMRI with an Optimized Single-Echo (OSE) acquisition (i.e. not with data derived from ME itself) enables a direct evaluation of two different acquisition approaches at their best performances.

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