1. An Adaptive Harmonic Separation Technique for Ultrasound Harmonic Imaging.
- Author
-
Yoon H and Song TK
- Subjects
- Phantoms, Imaging, Ultrasonography methods
- Abstract
Objective: An adaptive harmonic separation (HS) technique is proposed to overcome the limitations in conventional filtering techniques for ultrasound (US) tissue harmonic imaging (THI)., Methods: Based on expectation-maximization source separation, the proposed HS technique adaptively models the depth-varying fundamental and harmonic components in the frequency domain and separates the two by applying their calculated posterior probabilities. Phantom experiments with a Tx center frequency of 2 MHz are conducted to evaluate the proposed HS-based US THI schemes., Results: The phantom images show that the proposed single-pulse THI scheme utilizing the HS technique provides not only an average improvement of 19.2% in axial resolution compared to the conventional bandpass filtering scheme but also similar image quality to that of the conventional pulse-inversion (PI) scheme which requires two Tx/Rx sequences for each scan line. Furthermore, when combined with the PI technique, the HS technique provides a uniform axial resolution over the entire 170 mm imaging depth with an average improvement of 17.1% compared to the conventional PI scheme., Conclusion: These results show that the proposed adaptive HS technique is capable of improving both the frame rate and the image quality of US THI., Competing Interests: Conflict of interest disclosure Hansol Yoon and Tai-Kyong Song declare that they have no conflict of interest., (Copyright © 2024. Published by Elsevier Inc.)
- Published
- 2024
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