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Patient motion compensation during transthoracic 3-D echocardiography
M L Chuang1, M G Hibberd, R A Beaudin
1Charles A. Dana Research Institute and the Harvard-Thorndike Laboratory of the Department of Medicine, Cardiovascular Division, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA.
Ultrasound in Medicine & Biology
|April 24, 2001
Summary
Bulk patient motion during 3-D echocardiography (3DE) causes errors in left ventricular (LV) volume and ejection fraction (EF) measurements. A magnetic locating system effectively corrected for this motion, improving 3DE accuracy to levels comparable to MRI.
Area of Science:
- Cardiovascular Imaging
- Medical Physics
- Biomedical Engineering
Background:
- Transthoracic 3-D echocardiography (3DE) is susceptible to errors from patient motion.
- Bulk patient motion leads to image misregistration, affecting left ventricular (LV) volume and ejection fraction (EF) calculations.
Purpose of the Study:
- To assess the efficacy of a magnetic spatial location system in correcting for patient motion during 3DE.
- To improve the accuracy of LV volume and EF measurements obtained via 3DE.
Main Methods:
- 14 subjects underwent 3DE with induced motion.
- A magnetic locating system tracked the ultrasound transducer and patient's chest wall.
- Images were registered in a patient-centered coordinate system for motion correction.
- 3DE results were compared against magnetic resonance imaging (MRI) as a gold standard.
Main Results:
- Uncorrected 3DE showed significant differences from MRI for EF (r = 0.78, SEE = 5.8%).
- Motion correction significantly improved 3DE accuracy (EF: r = 0.91, SEE = 3.7%).
- Corrected 3DE accuracy was comparable to uncorrected 3DE without motion (EF: r = 0.93, SEE = 3.5%).
Conclusions:
- A magnetic spatial location system can effectively correct for bulk patient motion during 3DE.
- This correction method enhances the diagnostic accuracy of LV volume and EF measurements.
- The technique offers a viable solution for improving 3DE reliability in clinical settings.