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Image processing of x-ray computed tomography ( μCT ) scans of the samples reveals that porosity distribution is affected by powder spreading , and gradients in pore distribution in the sample are largely reduced after sintering .
 Image, x-ray computed tomography, samples, porosity, distribution, powder, pore, distribution, sample, sintering
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:
 Image, x-ray computed tomography, samples, porosity, distribution, powder, pore, distribution, sample, sintering