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Left ventricular ejection fraction estimation using mutual information on technetium-99m multiple-gated SPECT scans.

Shih-Neng Yang^1,2, Shung-Shung Sun³, Geoffrey Zhang⁴

¹Department of Biomedical Imaging and Radiological Science, China Medical University, No. 91, Hsueh-Shih Road, Taichung, 40402, Taiwan. shineng.yang@msa.hinet.net.

Biomedical Engineering Online

|December 25, 2015

Summary

A new method using mutual information (MI) on multigated acquisition (MUGA) images offers a more repeatable and reproducible way to calculate left ventricular ejection fraction (LVEF) compared to traditional methods.

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Area of Science:

Cardiology
Medical Imaging
Biomedical Engineering

Background:

Assessing left ventricular ejection fraction (LVEF) is crucial for monitoring cardiac health, especially during cardiotoxic chemotherapy.
Traditional methods for LVEF calculation using multigated acquisition (MUGA) images have limitations.

Purpose of the Study:

To introduce and evaluate a novel non-linear approach for calculating LVEF from MUGA images.
To compare the accuracy and reliability of this new method with conventional MUGA and echocardiography (ECHO) LVEF measurements.

Main Methods:

A retrospective study of 50 patients who underwent both MUGA and echocardiography (ECHO LVEF).
Application of mutual information (MI) theory to calculate LVEF from MUGA images, termed MUGA MI.
Comparison of MUGA MI with conventional MUGA LVEF and ECHO LVEF.

Main Results:

MUGA MI showed significantly higher repeatability (r=0.95) and reproducibility (r=0.90, 0.92) compared to conventional MUGA LVEF (r=0.80 and r=0.77, 0.83).
The correlation between MUGA MI and ECHO LVEF was stronger than that between conventional MUGA LVEF and ECHO LVEF.
MUGA MI estimations were significantly different from both MUGA LVEF and ECHO LVEF (p < 0.005).

Conclusions:

The proposed MUGA MI method demonstrates superior repeatability and reproducibility for LVEF assessment.
MUGA imaging combined with MI theory shows promise for more interchangeable LVEF measurements with ECHO LVEF.
This advanced technique may offer a more reliable alternative for monitoring cardiac function.