I am working on ultrasound image processing. I have one usb connected ultrasound probe and also I developed one application for imaging the collected data.
Device sending first phase of data as 2048*256 and it means raw data and I can show these on device and now I am in the step of scan conversion(polar to cartesian).
I can not totally understand how this 2048*256 image is in polar coordinate. How raw data is coming in polar coordinate ? And if it is polar coordinate how we are showing in rectangular ?
How we are changing from polar to cartesian and why we need this ?
I already developed application for imaging (just for raw data) but for the image processing side I can not totally understand the imaging flow. I know this question is too general but is there anyone to help about this subject
Dear Murat Bozkurt ,
Look the link, maybe useful.
Article Interconversion Between Truncated Cartesian and Polar Expans...
Article Simulation of digital scan conversion for ultrasound systems...
Regards,
Shafagat
It depends on your sensor, but probably this data is sort of 2048 measurements each involving 256 echo intensities or 256 measurements involving 2048 echo intensities.
The position of the echo intensity within the measurement is usually related to time (check timer resolution in the datasheet), so you can compute distance assuming constant speed of sound.
The angle is probably related to the measurement number. If you have 256 measurements and the sensor rotates 360 degrees, you can do the conversion easily.
Given angle and distance, conversion to cartesian is straightforward... if the sensor was not moving while gatheting the data. If it was, it all depends on how it moved and how fast it took to perform the scan.
Finally, if you want to plot jus points, you have to segment the data. An easy approximation is to use the largest echo intensity of each measurement.
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