It was believed that they could save human beings from much pain and misery. That they could do by enabling true diagnosis of the presence of a tumor, ulcer, etc. in any part of the body.
But soon those machines started to be misused by the unscrupulous people, including doctors and parents. The starting of the determination of the sex in the womb was, in fact, the start of the problem of female feticide.
It is of utmost importance to awaken the masses with the help of the media, the educational institutions and the NGOs. Those who indulge in this heinous practice should be socially boycotted.