noun. noise whose frequency goes beyond the wide range of audibility of human beings, which is, beyond 20 kHz. With regard to medicine, is utilized to gauge and document structures within the body in the imaging method of ultrasonography
noun. noise whose frequency goes beyond the wide range of audibility of human beings, which is, beyond 20 kHz. With regard to medicine, is utilized to gauge and document structures within the body in the imaging method of ultrasonography