Fast simulation of second harmonic ultrasound field using a quasi-linear method

Area of Science:

• Medical physics
• Acoustics
• Biomedical engineering

Background:

• Nonlinear sound propagation is key in medical ultrasound imaging via tissue harmonic imaging (THI).
• THI improves image quality by filtering echoes at the second harmonic frequency, reducing artifacts.
• Optimizing THI requires predicting ultrasound pulse amplitude and spatial distribution.

Purpose of the Study:

• To develop a rapid estimation method for ultrasound pulse characteristics.
• To enable accurate prediction of amplitude and spatial distribution for THI optimization.

Main Methods:

• A quasi-linear approximation method was developed for ultrasound pulse estimation.
• The method directly computes transverse profiles at any depth, avoiding stepwise propagation.
• It handles three spatial dimensions and arbitrary transducer geometries.

Main Results:

• The quasi-linear method accurately predicts pulse forms and spatial profiles.
• Results show satisfactory agreement with state-of-the-art simulators like KZKTexas and Abersim.
• The quasi-linear method offers significantly reduced computation time.

Conclusions:

• The quasi-linear approximation provides an efficient and accurate tool for ultrasound pulse prediction.
• This method can optimize image quality in medical ultrasound applications like THI.
• Faster computation enables more practical use in real-time imaging scenarios.