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polar plot of a data matrix....help is needed

Hello,
 
I'm working on an Ultrasound project, the data coming from the device is transmitted through a USB driver to the PC. I made a VI, that open a connection with the USB device and recieve the data. The coming data are recognized by the LabVIEW as stream of strings, so, i converted the data into a bytes using "string to byte array" function, then I used the function "reshape array" to reshape the data bytes into a 512x64 matrix which represents the no. of samples per ultrasound line times the no. of ultrasound lines.
 
I plotted the data on an intensity graph function and it worked, but the problem is that the data or the matrix must be plotted as a polar plot, not as a cartesian plot.
 
The problem is that I want to convert each single pixel (byte) of the (512x64) matrix from having (x,y) coordinate into a pixel that has (r, angle) coordinate.
 
can you help me plot these data in a polar plot. If any body has any suggestions please help.
 
best regards,
Underzero
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