I’m in a class that is discussing the operation of diagnostic ultrasound and I was confused by the colorization.
In: Physics
A blueshift corresponds to an increase in frequency of returning waves. Returning waves are ‘bluer’ as they are higher frequency.
When an ultrasound produces an image, it is because a computer takes those sound waves and records their strength/frequency. This is two numbers, but has no intrinsic color. The computer chooses to translate these two numbers into color and brightness which are then displayed to you. What color represents what frequency shift is totally arbitrary.
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