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Waars, H. (author)HyFoSy (Hysterosalpingo Foam Sonography) is a gynaecological procedure to test the tubal patency of infertile females. The procedure is performed with a transvaginal ultrasound probe and an intrauterine foam, ExEm©-Foam. The foam distends the walls of the fallopian tubes and has echogenic properties. The ultrasound waves excite the air bubbles...master thesis 2013