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AIM: To study the value of oral ferric ammonium citrate(FAC) solution as a negative gastrointestinal contrast agent in MR urography(MRU). 目的：研究枸櫞酸鉄銨作爲(wèi)胃腸道隂性對比劑對改善磁共振尿路成像（MRU）質(zhì)量的價值。