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Reliable estimation of virtual source position for SAFT imaging.

Chih-Hsiung Chang¹, Young-Fo Chang, Yushieh Ma

¹Institute of Applied Geophysics, National Chung Cheng University, Chiayi, Taiwan.

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

|January 30, 2013

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This study proposes using paraxial rays for virtual source estimation in synthetic aperture focusing technique (SAFT) imaging. This method improves axial resolution and signal-to-noise ratio (SNR) in flaw detection.

Area of Science:

Non-destructive testing
Ultrasonic imaging
Materials science

Background:

Synthetic aperture focusing technique (SAFT) is crucial for flaw imaging in immersion testing.
Accurate virtual source positioning is essential for SAFT performance.
Focal spot aberration often hinders precise virtual source determination.

Purpose of the Study:

To propose a novel method for virtual source position estimation in SAFT.
To enhance the accuracy and reliability of SAFT imaging.
To improve the axial resolution and signal-to-noise ratio (SNR) of reconstructed images.

Main Methods:

Analysis of energy radiated from focused transducers.
Investigation of refracted ultrasound energy with varying incident angles.

Related Experiment Videos

Last Updated: May 14, 2026

Topographical Estimation of Visual Population Receptive Fields by fMRI

Topographical Estimation of Visual Population Receptive Fields by fMRI

Published on: February 3, 2015

Utilizing paraxial rays for virtual source estimation in SAFT.

Main Results:

Paraxial rays provide a more reliable estimation of the virtual source position.
The proposed method significantly improves axial resolution in SAFT images.
Enhanced signal-to-noise ratio (SNR) is achieved in the reconstructed flaw images.

Conclusions:

Paraxial ray-based virtual source estimation is superior for SAFT.
This approach mitigates issues caused by focal spot aberration and interface effects.
The technique offers improved sensitivity and accuracy in ultrasonic flaw detection.