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Sound speed scanning acoustic microscopy for biomedical applications
Yoshifumi Saijo1, Hidehiko Sasaki, Naohiro Hozumi
1Department of Medical Engineering and Cardiology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan. saijo@idac.tohoku.ac.jp
Summary
Acoustic microscopy, a new pulsed wave technique, shows comparable results to conventional scanning acoustic microscopy (SAM) for biomedical imaging. This advanced SAM method offers faster calculations for pathological examination.
Area of Science:
- Biomedical Engineering
- Materials Science
- Pathology
Background:
- Scanning acoustic microscopy (SAM) has been developed since 1985 for biomedical applications, including pathological examination and biomechanical assessment.
- Conventional SAM utilizes continuous waves for imaging, with established utility in analyzing acoustic properties of organs and disease states.
- A novel concept, acoustic microscopy, employing a single pulsed wave, has been proposed as an alternative to continuous wave SAM.
Purpose of the Study:
- To compare the performance of a new acoustic microscopy system using pulsed waves against a conventional SAM system.
- To evaluate the utility of acoustic microscopy for biomedical imaging and pathological examination.
- To assess the potential of the new system for analyzing acoustic properties of biological tissues.
Main Methods:
- Comparison of a novel acoustic microscopy system (pulsed wave) with a conventional SAM system (continuous wave).
- Measurement and analysis of acoustic properties, including sound speed, amplitude, and phase, on the same biological material.
- Evaluation of data acquisition time and computational time for both systems.
Main Results:
- Sound speed images generated by acoustic microscopy closely correlated with those from conventional SAM.
- Biological samples with hyaline degeneration exhibited lower sound speed compared to normal myocardium.
- Frequency domain analysis of amplitude and phase demonstrated similar characteristics between the two methods.
- While frame acquisition was slower, the pulsed wave system required significantly less total calculation time.
Conclusions:
- Acoustic microscopy using pulsed waves is a viable alternative to conventional SAM for biomedical applications.
- The system demonstrates effectiveness in differentiating tissue characteristics, such as degenerative lesions.
- The computational efficiency of acoustic microscopy suggests its potential for rapid intraoperative pathological examination.