Reverse MRI

[fredreload]

At one end, the receiver picks up the radio wave and construct an image. To reverse it you create a transmitter and reverse the fourier transform to pinpoint the water molecules to communicate with the water molecules

[iNow]

How would you know where the water molecules are if instead of receiving a signal for measurement you’re sending a signal for some sort of transformation?

[fredreload]

1 hour ago, iNow said:

How would you know where the water molecules are if instead of receiving a signal for measurement you’re sending a signal for some sort of transformation?

The way they construct the image with fourier transform is based on signal strength I think(this is based on speculation). The way MRI works is first you fixed the position of the water molecules with a magnetic field, send a radio wave to it, then receive the radio wave bounces back from the water molecule with a receiver.

Now you dunno where the water molecules are, but you will know the signal strength this water molecule would receive. You already solved the water molecule's position when you generate an image using the fourier transform, that is how you get an image out of the water molecules position. As for the signal it is meant for wireless communication with nanomachines. But a nanomachine isn't polarized like a water molecule so. I dunno what sending a desired signal to the water molecule could be applied to

[swansont]

2 hours ago, fredreload said:

At one end, the receiver picks up the radio wave and construct an image. To reverse it you create a transmitter and reverse the fourier transform to pinpoint the water molecules to communicate with the water molecules

What do you mean by communicate?

51 minutes ago, fredreload said:

The way MRI works is first you fixed the position of the water molecules with a magnetic field, send a radio wave to it, then receive the radio wave bounces back from the water molecule with a receiver.

No, that's not how it works. You don't "fix" the position of the water. The magnetic field has a gradient so there will be a place in the machine where the signal has a resonance (vs a constant field, where the entire region would have a resonance). You can then scan the field so that position moves, and you can construct an image.

The signal is proportional to the amount of water. If water is there you get a signal. If it's not, you don't.

51 minutes ago, fredreload said:

Now you dunno where the water molecules are, but you will know the signal strength this water molecule would receive. You already solved the water molecule's position when you generate an image using the fourier transform, that is how you get an image out of the water molecules position. As for the signal it is meant for wireless communication with nanomachines. But a nanomachine isn't polarized like a water molecule so. I dunno what sending a desired signal to the water molecule could be applied to

You do a Fourier transform because you make the measurement in the time domain, and want an answer in the frequency domain.

https://www.york.ac.uk/res/sbd/nmr/nmr_ft.html

[fredreload]

21 minutes ago, swansont said:

You do a Fourier transform because you make the measurement in the time domain, and want an answer in the frequency domain.

https://www.york.ac.uk/res/sbd/nmr/nmr_ft.html

Agreed, thanks for the clarification sir

P.S. Reconstruction?

Edited December 4, 2018 by fredreload