A few hints to get you started
What kind of ultrasonic sensor is it?
If it's the type used in medical imaging, there may be a manual describing the data format of its output.
If it's just a simple ultrasonic sensor, then the datasheet for it (if there is one) should show some kind of information about what the output should be also.
Once you know the data format you can work on putting into a format that can later be used for image stuff.
For instance, if each sensor output is a stream of data representing a 2D slice, you'll need to work out how to convert that to a useful format. This may involve splitting the string every X bytes to get a new image "lines".
eg. how to convert an output of abcdefghi to
abc
def
ghi
You may also need to convert it to compatible number bases such as U8 or U16 before trying to convert to an image.
There is an array to image block that can be used to turn arrays of numbers into images. This may be useful for your situation.
Your initial post mentions 3D and 1D
If you have just a single dimension output (such as if you were moving a basic ultrasonic sensor along a path to measure distance), then you could pretty much just plot the cleaned data directly (once it was converted from the actual sensor output if needed).
