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Two Algorithms for High-throughput and Multi-parametric Quantification of Drosophila Neuromuscular Junction Morphology

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Hierarchical iterative linear-fitting algorithm (HILA) for phase correction in fat quantification by bipolar

Chao Zou¹, Chuanli Cheng^1,2, Yangzi Qiao¹

¹Paul C. Lauterbur Research Center for Biomedical Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China.

Quantitative Imaging in Medicine and Surgery

|April 13, 2019

Summary

This summary is machine-generated.

A new hierarchical iterative linear-fitting algorithm (HILA) corrects eddy current-induced phase errors in bipolar gradient echo sequences for accurate fat fraction quantification. This method improves efficiency without extra data, matching unipolar sequence results.

Keywords:

Bipolar acquisition eddy current fat quantification fat-water separation

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Area of Science:

Magnetic Resonance Imaging (MRI)
Medical Physics
Quantitative Imaging

Background:

Multi-echo gradient echo (GRE) sequences with bipolar readout gradients offer higher acquisition efficiency for fat fraction (FF) quantification.
Eddy current-induced phase (EC-phase) in bipolar sequences can compromise phase consistency and lead to inaccurate FF measurements.

Purpose of the Study:

To develop and evaluate a novel algorithm for correcting EC-phase in bipolar GRE sequences.
To assess the accuracy of fat fraction quantification using the proposed method compared to unipolar acquisitions.

Main Methods:

A hierarchical iterative linear-fitting algorithm (HILA) was developed for EC-phase correction.
Monte Carlo simulations evaluated the impact of residual EC-phase on FF accuracy.
HILA performance was compared against unipolar acquisition in phantom and in vivo 3T MRI experiments.

Main Results:

Simulations indicated robustness to residual EC-phase with specific echo time differences (ΔTE).
Phantom studies showed HILA achieved <2% mean FF error, approximating higher-order EC-phase terms.
In vivo experiments demonstrated no significant FF difference between bipolar (HILA-corrected) and unipolar acquisitions.

Conclusions:

The HILA method offers a simple, efficient EC-phase correction for bipolar acquisition without additional data.
Optimizing echo times (TEs) can further mitigate residual EC-phase effects for accurate FF quantification.