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This study presents an automated thresholding method for analyzing and quantifying the internal composition of additive manufacturing ( AM ) parts using computed tomography ( CT ) data .
 concept or principle: composition; manufacturing process: additive manufacturing; manufacturing process: AM; process characterization: computed tomography; enabling technology: CT; concept or principle: data
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: 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} 
 Entities: composition, additive manufacturing, AM, computed tomography, CT, data 
Answer:
 concept or principle: composition; manufacturing process: additive manufacturing; manufacturing process: AM; process characterization: computed tomography; enabling technology: CT; concept or principle: data