Ultrasound standoff deformation validation test

[SteFan89]

Hello

I am using a polyvinylchloride standoff for encapsulating the ultrasound probe while scanning.

In order, to measure its accuracy on deformation related to specific forces, I need to do a validation test to assess its accuracy in deformation under known volume.

In that essence, I am using different pin sizes (e.g. 2.5mm, 3.5mm, 5.0mm) in diameter and I apply force while compressing the standoff upon those pins. The standoff gets deformed. Less force, less deformation and the reverse.

I now have the data in an excel file. I need to estimate how, the pin size in the ultrasound image is deviating from the original pin size. For instance, if I measure the 2.5mm pin size, and I am able to measure 2.5 mm in the ultrasound image, then I can say that I have an ideal deformation of the standoff with no error at all.

I am confused of how to implement it. I am thinking of taking a small margin area in the ultrasound image where the pin peak is, and measure the maximum pin height that can be depicted in the ultrasound image. I'll do this procedure for several pixel columns and then I will calculate the standard deviation among the pixel columns. Finally, I will subtract the standard deviation from the original pin size to estimate the error.

Is my procedure correct? Is something that I miss, can you suggest me a better method?

Thank you

 

[Compositepro]

Posting a question in multiple forums is against site rules. It leads to bifurcated discussions on the same topic. Your question does not seem to have anything to do with rubber or with plastic really. It is about how to calibrate your ultrasonic instrument. I have used c-scans before and do not see how you get your attached image by using a pin in air. You have told us almost nothing about your instrument. There is a measurement and instrumentation forum that would be more appropriate for your question.

 

[SteFan89]

No, its not about calibration. The pin is not in the air. It is on the table. Above the pin is the standoff material which is plastic (polymer). Can you please answer now to my question? It is a polymer and rubber material as well.

 

[SteFan89]

Roughly, what I want to find are the specificity and sensitivity criteria of the pin images, so I can estimate the accuracy of the standoff deformation