1008
From our own investigations on phantoms , the smallest signal - to - noise ratio ( delta S min / delta R ) was obtained which determines the minimal contrast , given the film properties ( film response S , film gradient gamma ) and the amount of scatter .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
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