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乳腺成像术前MR成像乳腺实质背景信号强化率:与导管原位癌病人保乳术后局部复发的关(DOI:10.3874/j.issn.1674—1897.2014.03.10301)Background parenchymal signal enhancement ratio at preoperative MR imaging: association with subsequent local recurrence in patients with ductal carcinoma in situ after br