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In this work , X-ray tomography was employed to provide insights into pore closure efficiency by HIP for an intentional and artificially-induced cavity as well as for a range of typical procesB-induced pores ( lack of fusion , keyhole , contour pores , etc .
 X-ray tomography, pore, HIP, as, as, range, pores, fusion, contour
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:
 X-ray tomography, pore, HIP, as, as, range, pores, fusion, contour