Application of Point Shearwave Elastography to Breast Ultrasonography: Initial Experience Using “S-Shearwave” in Differential Diagnosis
이명환, 김은경, 이은주, 김하얀, 윤정현,
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이명환 ( Lee Myung-Hwan )
Yonsei University College of Medicine Severance Hospital Department of Radiology
김은경 ( Kim Eun-Kyung )
Yonsei University College of Medicine Severance Hospital Department of Radiology
이은주 ( Lee Eun-Ju )
Yonsei University College of Medicine Biostatistics Collaboration Unit
김하얀 ( Kim Ha-Yan )
Yonsei University College of Medicine Biostatistics Collaboration Unit
윤정현 ( Yoon Jung-Hyun )
Yonsei University College of Medicine Severance Hospital Department of Radiology
Abstract
Purpose: To evaluate the optimal measurement location, cut-off value, and diagnostic performance of S-Shearwave in differential diagnosis of breast masses seen on ultrasonography (US).
Materials and Methods: During the study period, 225 breast masses in 197 women were included. S-Shearwave measurements were made by applying a square region-of-interest automatically generated by the US machine. Shearwave elasticity was measured three times at four different locations of the mass, and the highest shearwave elasticity was used for calculating the optimal cut-off value. Diagnostic performance was evaluated by using the area under the receiving operator characteristic curve (AUC).
Results: Of the 225 breast masses, 156 (69.3%) were benign and 69 (30.7%) were malignant. Mean S-Shearwave values were significantly higher for malignant masses (108.0 ± 70.0 kPa vs. 43.4 ± 38.3 kPa; p < 0.001). No significant differences were seen among AUC values at different measurement locations. With a cut-off value of 41.9 kPa, S-Shearwave showed 85.7% sensitivity, 63.9% specificity, 70.7% accuracy, and positive and negative predictive values of 51.7% and 90.8%, respectively. The AUCs for US and S-Shearwave did not show significant differences (p = 0.179).
Conclusion: S-Shearwave shows comparable diagnostic performance to that of grayscale US that can be applied for differential diagnosis of breast masses seen on US.
키워드
Breast; Ultrasonography; Neoplasm; Elasticity Imaging Techniques
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