Abstract
Tissue harmonic imaging (THI) uses the harmonic signal that is generated by tissue itself. THI contains minimal noise and clutter compared with conventional B-mode ultrasound. The narrowed beam width improves lateral resolution; the shorter wavelength of the return harmonic signal also improves the axial resolution. THI improves the breast image quality, which is especially evident for showing the contours, margins, internal echo features, calcifications, and edge shadows when compared with conventional ultrasound. Cystic tumors, such as small cysts, intraductal tumors, and intracystic tumors, are well visualized by THI. By providing superior image quality of sonographic findings of contours, margins, and internal microcalcifications, THI may allow a more confident diagnosis of solid tumors of the breast. Although the decreased sound transmission observed in the lesion has a large amount of interstitial fibrosis, it is more striking on THI than with conventional ultrasound. Nevertheless, THI may provide more accurate breast tissue characterization than conventional sonography. THI promises to improve the diagnostic confidence for breast tumors.
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