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Breast ultrasound

¹Institute of Clinical Medicine, University of Tsukuba, Japan.

Gan to Kagaku Ryoho. Cancer & Chemotherapy

|March 1, 1996

Summary

Ultrasonic imaging relies on tissue acoustic impedance, which influences echo patterns. Understanding these echo characteristics aids in differentiating benign and malignant breast tumors, improving diagnostic accuracy.

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Area of Science:

Medical Imaging
Biophysics
Diagnostic Ultrasound

Background:

Ultrasound imaging utilizes echoes from tissues with varying acoustic impedance.
Acoustic impedance depends on sound speed and bulk modulus, affected by tissue composition like fibrosis and calcification.
Tissue properties, such as high water content in cysts or high fiber content in stellate carcinoma, significantly alter echo patterns.

Purpose of the Study:

To explain the fundamental principles of ultrasonic image formation based on tissue acoustic properties.
To demonstrate how variations in echo attenuation and accentuation correlate with histological features of breast lesions.
To highlight the role of ultrasound, including Color Doppler, in diagnosing breast cancer and guiding interventional procedures.

Main Methods:

Analysis of acoustic impedance, sound speed, and bulk modulus in different human tissues.
Correlation of ultrasound echo characteristics (attenuation, accentuation) with histological findings of breast tumors (stellate vs. circumscribed carcinoma, fibroadenomas).
Evaluation of Color Doppler findings in breast cancer vascularity and ultrasound's role in detecting intraductal spread and guiding biopsies.

Main Results:

High water content masses (cysts) accentuate posterior echoes, while fibrous tissues (stellate carcinoma) attenuate them.
Circumscribed carcinomas and immature fibroadenomas show accentuated posterior echoes due to high cellularity.
Color Doppler reveals tortuous, tortuous feeding arteries in breast cancer, aiding diagnosis and treatment planning.

Conclusions:

Understanding tissue characterization through ultrasound echo analysis simplifies image interpretation.
Ultrasound, enhanced by Color Doppler, is crucial for diagnosing breast cancer, evaluating intraductal spread, and guiding biopsies for nonpalpable lesions.
Mastery of ultrasound techniques, including guided biopsy, is essential for accurate diagnosis and effective breast cancer management.

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