A method for measuring the angle between left atrial and left ventricular long axes using 3D echocardiography

Area of Science:

• Cardiology
• Medical Imaging
• Echocardiography

Background:

• Standard 2D echocardiography views for left atrial (LA) measurements may introduce errors.
• Variations in the angle between the left atrial and left ventricle long axes (LA-LV angle) can cause foreshortening of the LA.

Purpose of the Study:

• To investigate the feasibility and accuracy of measuring the LA-LV angle and its deviation from the 4-chamber plane using 3D echocardiography.
• To assess the repeatability and reproducibility of these novel measurements.

Main Methods:

• Developed a 3D echocardiography method to measure the LA-LV angle and its deviation from the 4-chamber plane by marking anatomic reference points.
• Validated the method using wooden and agar-agar phantoms.
• Assessed measurement repeatability and reproducibility in phantoms and human subjects.

Main Results:

• Ultrasound measurements showed excellent agreement with true angles in phantoms (LA-LV angle bias: 0.5-1.2 degrees).
• Measurements demonstrated good repeatability and reproducibility in phantoms (Pearson correlation: .91–.99).
• Human subject measurements showed good repeatability (Pearson correlation: .81 for LA-LV angle, .97 for deviation).

Conclusions:

• Measurement of the LA-LV angle using 3D echocardiography is a feasible tool.
• This method can help investigate potential errors in 2D echocardiography LA measurements.