How is ultrasound used to view an unborn baby?
In: Technology
So far the explanations have mentioned the first half of the process: emitting high-frequency (“ultrasound”) waves and using receivers to detect the returning super-acoustic “echo” waves.
The other half of the explanation: how do the sound “echo” signals actually get reconstructed into a picture? The pixels in the picture are each calculated using math, based on the principles of the *Fourier Transform*.
In its most basic form, that math is more familiar to us in audio processing, to convert data of amplitude and phase, into an audio waveform.
In ultrasound imaging, various math techniques are used, to push for image detail, absence of image artifacts, and fast image reconstruction. 3-D image reconstructions need way more computer processing than 2-D images.
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