Different Types of Ultrasound Elastography – the Value in Breast Cancer Diagnosis. Preliminary Results
32 patients aged from 26 up to 82 years old with breast solid lesions have been examined. During morphological examination breast cancer was revealed in 16 patients, fibroadenoma in 9 patients, and fibrocystic disease in 7 patients. All patients underwent ultrasound elastography on different scanners with measurement of tissue difference index (strain ratio, SWE-ratio). There were the following values of tissue difference index in group of patients with breast cancer (depending on scanner): at compressive elastography on Aplio XG (Toshiba, Japan) - 12.2 (median), (9.1-15.6 (interquartile range), 2.4-49.1 (2.5 <sup>th</sup>-97.5 <sup>th</sup> percentiles) and 2.4-49.1 (minimal - maximal values)); at compressive elastography on Hi Vision 900 (Hitachi, Japan) - 9.8 (7.4-15.5, 3.3-28.9 and 3.3-28.9); at shear wave elastography on Aixplorer (Supersonic Imagine, France) - 9.8 (8.3-12.1, 2.8-15.7 and 2.8-15.7). Values of tissue difference index in group of patients with benign breast lesions: at compressive elastography on Aplio XG (Toshiba, Japan) - 3.0 (1.6-4.4, 0.8-6.7 and 0.8-6.7); at compressive elastography on Hi Vision 900 (Hitachi, Japan) - 2.5 (1.5-4.0, 0.7-8.1 and 0.7-8.1); at shear wave elastography on Aixplorer (Supersonic Imagine, France) - 1.8 (1.1-3.3, 0.2-6.7 and 0.2-6.7). Significant variances of tissue difference index during repeated examinations of same object on scanners with compressive elastography decrease the possibilities of using this method in practical work. Such variances weren't noticed during ultrasound diagnostics with shear wave elastography. Sensitivity of compressive elastography (Aplio XG (Toshiba, Japan)) in breast cancer diagnosis with srain ratio >6.7 was 93.8%, specificity - 100%, accuracy - 96.7%. Sensitivity of compressive elastography (Hi Vision 900 (Hitachi, Japan)) in breast cancer diagnosis with strain ratio >6.1 was 81.3%, specificity - 93.8%, accuracy - 87.5%. Sensitivity of shear wave elastography (Aixplorer (Supersonic Imagine, France)) in breast cancer diagnosis with SWE- ratio >6.7 was 87.5%, specificity - 100%, accuracy - 93.8%.