When force is applied to a material, distortion may cause it to generate electricity.
This phenomenon is known as the piezoelectric effect, and it is commonly observed in crystals and certain ceramics, being widely used in piezoelectric devices such as mobile speakers and sonar systems.
Originally, the piezoelectric effect is a property observed in inorganic single-crystal materials, and its characteristics are determined by the order and symmetry of atomic arrangements in the crystal.

In recent years, ultrasound imaging devices have been gaining attention as tools that enable rapid bedside examinations in outpatient and home care settings, with growing demand for their role in improving the quality of medical care and patients’ quality of life (QOL).
In addition to conventional “visual examinations” and “observation of internal structures via echo”, the ASEM method offers a new perspective closer to pathological evaluation (= a “third eye”), enabling more precise diagnoses and faster treatment decisions.

ASEM is a technique that visualizes electrical signals (ASEM signals) induced by ultrasound pressure in fibrous biological tissues such as bones, tendons, ligaments, and arterial walls or valves.
From these signals, it is possible to image the “quality” of tissues—such as the crystallinity and orientation of collagen and elastin.
In particular, it is being applied to the diagnosis of organ fibrosis in cancer and chronic diseases, and to the quantification and visualization of treatment effects for fractures and tendon ruptures, as well as rehabilitation outcomes.

Collagen is a key structural protein in our bodies, not only forming the musculoskeletal system but also being widely distributed across organs and blood vessels.
Fractures and joint diseases are a leading cause of mobility issues and the need for nursing care and support, and as global aging accelerates, maintaining physical function is critical for independent living.
Early recovery from fractures or tendon injuries is crucial for both individual QOL and social reintegration.

This project aims to expand applications beyond clinical diagnosis and treatment, to include rehabilitation and daily health management.
By utilizing ASEM, we hope to help people better understand their physical condition and enjoy appropriate exercise, enabling them to live healthy and fulfilling lives.


ref.)
Nature Research Highlights “ The body electric: soft tissue makes electricity under stress“
APS Physics: Soft Biological Tissues Can Be Piezoelectric.
“Electric Polarization of Soft Biological Tissues Induced by Ultrasound Waves”, Phys. Rev. Lett.123, 238101 (2019) (Original manuscript, Supplemental material)

The magnetic properties of steel—such as crystal phase, grain size, residual stress, corrosion, defects, and heat treatment history—are sensitive to various factors, making them effective indicators for non-destructive testing.
Our advanced localized magnetic measurement system, unlike conventional magnetic inspection methods, enables non-contact or semi-contact imaging and quantification of subtle magnetic variations using ultrasound.

As a non-destructive testing solution, it allows accurate assessment of steel conditions, improving safety and durability, and contributing to reduced production costs.

ASEM enables magnetic imaging and hysteresis measurement using ultrasound.
It detects signs of corrosion, degradation, embrittlement, residual stress, and metal fatigue, as well as subtle material inhomogeneities invisible to the eye.
This technology shows promise for non-destructive inspection of materials like steel.

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Evolution of ASEM

Toward a next-generation measurement platform beyond time.