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Updated: Jan 8, 2026

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Detection of Architectural Distortion in Prior Mammograms via Analysis of Oriented Patterns

Published on: August 30, 2013

Circular array based on the tangent line method.

Tsutomu Kaizuka¹, Kaisei Koshiishi¹

¹Department of Mechanical Science and Engineering, Kogakuin University, 2665-1 Nakano-machi, Hachioji-shi, Tokyo 192-0015, Japan.

The Journal of the Acoustical Society of America

|December 17, 2025

Summary

The tangent line method (TLM) uses circular arrays for acoustic beamforming, overcoming line array limitations. This approach enables precise control over curvilinear acoustic beams for enhanced directivity and distance discrimination.

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Area of Science:

Acoustics
Signal Processing
Array Signal Processing

Background:

The tangent line method (TLM) generates curvilinear acoustic beams using array signal processing.
Previous TLM studies focused on line arrays, which suffer from undesired back-lobe beams due to symmetry.

Purpose of the Study:

To investigate the use of asymmetric circular arrays for TLM to overcome limitations of line arrays.
To formulate array signal processing for generating circular beams with circular arrays.

Main Methods:

Developed array signal processing techniques for circular beam generation using circular arrays.
Validated the theoretical framework through computational simulations and experimental testing.

Main Results:

Circular arrays effectively generate curvilinear acoustic beams without the back-lobe issues of line arrays.
The trajectory of the generated beam can be precisely controlled for directivity and distance discrimination.

Conclusions:

Circular arrays are a viable alternative to line arrays for TLM applications.
The developed methods enable enhanced control over acoustic beamforming for various applications.