Three-Dimensional Field Optimization Method: Gold-Standard Validation of a Novel Color Doppler Method for Quantifying...

Area of Science:

• Cardiovascular Imaging
• Medical Ultrasound Technology
• Quantitative Echocardiography

Background:

• Accurate diagnosis of mitral regurgitation (MR) severity is crucial for effective patient treatment.
• Current clinical techniques for MR quantification lack a definitive gold standard.
• Previous work introduced the automated 3D Field Optimization Method (FOM) algorithm using 3D color Doppler ultrasound.

Purpose of the Study:

• To extensively validate the accuracy, ease of use, and repeatability of the 3D FOM algorithm.
• To compare the performance of 3D FOM against a gold-standard flow probe and the 2D PISA method.
• To assess the clinical utility of 3D FOM for quantifying MR severity.

Main Methods:

• The 3D FOM algorithm was applied to explanted ovine mitral valves in a left heart simulator.
• Twenty-nine unique regurgitant geometries were created by systematically perturbing the valves.
• 3D FOM was compared with a flow probe and the 2D proximal isovelocity surface area (PISA) method for MR volume quantification.

Main Results:

• 3D FOM showed a smaller overall error (5.2 ± 9.9 mL) in MR volume compared to 2D PISA (-6.9 ± 7.7 mL).
• 2D PISA was superior for round orifices and mild MR, while 3D FOM demonstrated significant improvement for slit-type orifices and severe MR.
• 3D FOM processing was faster, simpler, required fewer acquisitions, and exhibited no significant interuser variability, unlike 2D PISA.

Conclusions:

• 3D FOM offers improved accuracy for complex or severe mitral regurgitation compared to 2D PISA.
• The enhanced repeatability and simpler workflow of 3D FOM suggest increased clinical value.
• 3D FOM represents a promising advancement in the accurate quantification of mitral regurgitation severity.