http://med-sci.cn/cgzcx/en/contents_list.asp?issue=201206 zh-cn An RSS feed for Chinese Journal of Magnetic Resonance Imaging http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.001 500 examinations) radiologists applying previously published descriptors. The kNN was used for differential diagnosis of malignant vs. benign lesions: First, Recursive Feature Elimination was applied to identify importance of individual descriptors. Accordingly, categories of most important descriptors were created (“top-3”, “top-7” and “top-12”, “all”). Corresponding descriptors were used as input data and the four resulting kNN were quantified, independently (4-fold cross validation; AUC: Area under the ROC-curve) followed by AUC-comparison. Results: Histopathology revealed 196 benign and 347 malignant lesions. Highest AUC was 0.940 (“all” descriptors). It decreased slightly to 0.928 if the “top-12” descriptors were used (P=0.23). Further reduction of input-dimensionality significantly decreased (P<0.05) accuracy of the kNN (“top-7”: AUC=0.895; “top-3”: AUC=0.816). Conclusion: The kNN showed high diagnostic accuracy for prediction of malignancy on unknown data (AUC=0.940). For this approach application of detailed descriptors (n≥12) is useful, demonstrating the benefit of kNN for the assessment of multidimensional radiological data.]]> Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.002 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.003 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.004 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.005 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.006 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.007 0.05). Conclusion: Application the 3.0 T MRI dynamic contrast-enhanced and DWI scan, can better show lesions form and the strengthen way, combined with morphology characteristics, hemodynamic performance and function characteristics, help to infiltrating ductal carcinoma of preoperative diagnosis.]]> Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.008 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.009 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.010 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.011 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.012 Wed,20 Jun 2012 00:00:00 GMT http://med-sci.cn/cgzcx/en/en_articlexml.asp?doi=10.3969/j.issn.1674-8034.2012.06.013 Wed,20 Jun 2012 00:00:00 GMT