Abuur nooc ka mid ah weedhan oo aad u adag Calaamadaha ultrasound waxay ka caawiyaan ugaarsadayaasha habeenkii inay bartaan inay ka fogaadaan daanyeerada Dunning DC, Roeder KD (1965) Codadka daanyeerada iyo dabeecadda cayayaanka qabashada ee duqsiyada.
Dabcan, nooc ka mid ah jumlada ayaa ah "Shayga ultrasound wuxuu ka caawiyaa ugaarsadayaasha habeenkii inay bartaan inay ka fogaadaan daanyeerada (Dunning iyo Roeder 1965, Hristov iyo Conner, 2005), waxayna faragelin ku yeelan karaan awoodda batka si ay si sax ah u helaan daanyeerada duulaya (Ratcliffe iyo Fullard, 2005). "