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This paper demonstrates a novel examination method of acetabular hip prosthesis cups based on X-ray computed tomography ( CT ) and image processing .
 hip prosthesis, X-ray computed tomography, CT, image
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: manufacturing standard, machanical property, manufacturing process, material, engineering feature, process parameter, machine or equipment, application, process characterization, enabling technology, biomedical, concept or principle 
Text: {0} 
Answer:
 hip prosthesis, X-ray computed tomography, CT, image