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Old Dec 8th 2016, 04:06 PM   #1
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Compression of a signal and pulse wave doppler questions.

I have two questions
first is about compression of a signal. In ultrasound imaging we increase the compression (in other words decrease the dynamic range) to produce an image with more contrast. What does compression actually do. My understanding is that it merges the signals of very little difference and so the difference between signals of greater difference become more prominent. (for example if there are signals of suppose 1,2,3, 4, 8 intensity, the 1,2 and 3 will be merged and will be shown as single intensity of 2 and now difference between signal of 2 intensity and 4 intensity will be more prominent. Am I right?
2nd question is about Pulse wave doppler which is used to interrogate velocity of a moving object in ultrasound imaging. If PW doppler spectral signal is too big we can increase the scale so that it fits on the display screen. I thought that increasing the scale just changes the display and makes it smaller but i see that increasing the scale also changes the audible sound of PW doppler so my question is what is actually done when we increase the scale. thanks
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Old Dec 10th 2016, 10:02 AM   #2
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There are several different possible interpretations I could dream up for the term "compression" in your post.
However without being familiar with the technicalities of ultrasound imaging, any response I might give would be pretty much guesswork.

Since no-one else has replied to your post, I suspect that the others are in a similar position.

Are there any ultrasound technicians out there who can help us out?

Last edited by Woody; Dec 11th 2016 at 01:37 AM.
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