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Breast examinations with continuous wave and color Doppler
1University of Freiburg, Department of Gynecology and Obstetrics, Freiburg, Germany.
Summary
Continuous wave Doppler effectively identifies malignant breast lesions, but combining it with B-mode ultrasound improves detection in non-palpable cases. Color Doppler shows promise but requires careful evaluation due to variable sensitivity.
Area of Science:
- Medical imaging
- Diagnostic ultrasound
- Oncology
Background:
- Continuous wave Doppler (CWD) has been a long-standing method for characterizing malignant breast lesions, with high detection rates for abnormal vascularity in carcinomas.
- CWD alone is limited to palpable lesions, necessitating combined approaches for improved diagnostic accuracy, particularly for non-palpable findings.
- Advancements in ultrasound technology, specifically color flow mapping (CFM), have enhanced sensitivity for detecting flow in microscopic vessels not visible with B-mode alone.
Purpose of the Study:
- To evaluate the capability of color Doppler (CD) for investigating abnormal blood flow in breast malignancies.
- To compare the diagnostic performance of CD with continuous wave Doppler (CWD) in symptomatic women with breast lesions.
- To assess the impact of equipment variations and lesion characteristics on CD sensitivity.
Main Methods:
- Examined 120 symptomatic women with breast lesions using different types of color Doppler equipment.
- Compared findings from color Doppler investigations with those obtained from continuous wave Doppler.
- Analyzed the sensitivity of color Doppler in detecting abnormal vascularity, considering factors like lesion vascularity and Doppler frequency.
Main Results:
- Color Doppler failed to detect flow signals in ten of 44 carcinomas (false-negative cases), while CWD identified low vascularity in all these instances.
- No false-positive reports were made for patients with benign breast disease using color Doppler.
- Heterogeneous vascularity in breast malignancies presented a major difficulty for flow assessment with color Doppler, especially at lower frequencies (< or = 5 MHz).
Conclusions:
- While color Doppler shows potential for detecting abnormal blood flow in breast malignancies, its sensitivity can be variable, leading to false-negative results in some carcinomas.
- Continuous wave Doppler remains a reliable method, particularly for identifying low vascularity in lesions missed by color Doppler.
- Careful selection of equipment and Doppler frequency is crucial for optimizing the diagnostic accuracy of color Doppler in breast lesion evaluation.