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Keywords:
Gastrointestinal tract, Oncology, CT, CT-Quantitative, Computer Applications-Detection, diagnosis, Genetic defects
Authors:
Y. chai, J. B. Gao; Zhengzhou/CN
DOI:
10.1594/ecr2017/C-2616
Results
Among 552 lymph nodes found in CT images,
338 nodes were positive and 214 were negative.
The results of t test showed that the short diameter,
the ratio of short to long diameter,
the CT number and iodine value in every phase of positive lymph nodes were higher than these of negative lymph nodes.
The area under curve of ROC of the short diameter,
the ratio of short to long diameter,
the CT number in precontrast,
AP and VP,
the iodine value in AP and VP of lymph nodes were 0.600,
0.880,
0.648,
0.832,
0.755,
0.864,
0.835,
respectively.
Taking the ratio of short to long diameter over 7.25 as optimal diagnosis threshold,
the sensitivity was 75.6% and the specificity was 93.5%.
Taking the CT number in AP over 49.75HU,
the sensitivity was 66.9% and the specificity was 88.8%.
Taking the CT number in VP over 59.80HU,
the sensitivity was 69.9% and the specificity was 77.6%.
Taking the iodine value in AP over 9.65(100ug/cm3),
the sensitivity was 80.4% and the specificity was 82.2%.
Taking the iodine value in VP over 15.65(100ug/cm3),
the sensitivity was 69.9% and the specificity was 86.9%.
Combined the ratio of short to long diameter with the iodine value in AP,
the sensitivity was 95.2% and the specificity was 76.9%.