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Radiologia Brasileira

On-line version ISSN 1678-7099


CALAS, Maria Julia Gregorio; ALVARENGA, André Victor; GUTFILEN, Bianca  and  PEREIRA, Wagner Coelho de Albuquerque. Evaluation of morphometric parameters calculated from breast lesion contours at ultrasonography in the distinction among BI-RADS categories. Radiol Bras [online]. 2011, vol.44, n.5, pp.289-296. ISSN 1678-7099.

OBJECTIVE: To assess the performance of morphometric parameters calculated from breast lesion contours at ultrasonography, in the quantification of morphological features and in the distinction among BI-RADS categories 2, 3, 4 and 5. MATERIALS AND METHODS: The present casuistry included 40 cases, with orthogonal imaging of patients submitted to surgery. Based on the lesions segmentation, the following five morphometric parameters were calculated: area ratio, overlap ratio, normalized residual value, circularity and depth-to-width ratio. Linear discriminant analysis was applied to select the best parameters, and ROC curve was utilized as figure of merit. RESULTS: Overlap ratio was able to statistically distinguish breast lesions classified as BI-RADS 3 from others classified as BI-RADS 4 (a = 5%; p = 0.015). Additionally, such parameter presented the best performance in the differentiation between malignant and benign breast lesions. CONCLUSION: These results indicate that morphometric analysis of breast lesions at ultrasonography seems to be helpful in distinguishing patients who should undergo biopsy from those to be followed-up only with imaging methods.

Keywords : Breast ultrasonography; BI-RADS; Computer-assisted image processing; Computerassisted image interpretation.

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