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To characterize the pore morphologies and porosity evolution , the CS Ti6Al4V sample is characterized by optical microscopy and X-ray computed tomography ( XCT ) .
 pore, morphologies, porosity, evolution, Ti6Al4V, sample, optical microscopy, X-ray computed tomography
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:
 pore, morphologies, porosity, evolution, Ti6Al4V, sample, optical microscopy, X-ray computed tomography