Abstract
Purpose
The aim of this study was to investigate the feasibility of quantitative image analysis to differentiate hepatic nodules on gray-scale sonographic images.
Methods
We retrospectively evaluated 35 nodules from 31 patients with hepatocellular carcinoma (HCC), 60 nodules from 58 patients with liver hemangioma, and 22 nodules from 22 patients with liver metastasis. Gray-scale sonographic images were evaluated with subjective judgment and image analysis using ImageJ software. Reviewers classified the shape of nodules as irregular or round, and the surface of nodules as rough or smooth.
Results
Circularity values were lower in the irregular group than in the round group (median 0.823, 0.892; range 0.641–0.915, 0.784–0.932, respectively; P = 3.21 × 10−10). Solidity values were lower in the rough group than in the smooth group (median 0.957, 0.968; range 0.894–0.986, 0.933–0.988, respectively; P = 1.53 × 10−4). The HCC group had higher circularity and solidity values than the hemangioma group. The HCC and liver metastasis groups had lower median, mean, modal, and minimum gray values than the hemangioma group. Multivariate analysis showed circularity [standardized odds ratio (OR), 2.077; 95 % confidential interval (CI) = 1.295–3.331; P = 0.002] and minimum gray value (OR 0.482; 95 % CI = 0.956–0.990; P = 0.001) as factors predictive of malignancy. The combination of subjective judgment and image analysis provided 58.3 % sensitivity and 89.5 % specificity with AUC = 0.739, representing an improvement over subjective judgment alone (68.4 % sensitivity, 75.0 % specificity, AUC = 0.701) (P = 0.008).
Conclusion
Quantitative image analysis for ultrasonic images of hepatic nodules may correlate with subjective judgment in predicting malignancy.
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Conflict of interest
The authors declare that there is no conflict of interest. Naoki Matsumoto has no conflict of interest. Masahiro Ogawa has no conflict of interest. Kentaro Takayasu has no conflict of interest. Midori Hirayama has no conflict of interest. Takao Miura has no conflict of interest. Katsuhiko Shiozawa has no conflict of interest. Masahisa Abe has no conflict of interest. Hiroshi Nakagawara has no conflict of interest. Mitsuhiko Moriyama has no conflict of interest. Seiichi Udagawa has no conflict of interest.
Ethical standard
All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2008. Informed consent was obtained from all patients for being included in the study.
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Matsumoto, N., Ogawa, M., Takayasu, K. et al. Quantitative sonographic image analysis for hepatic nodules: a pilot study. J Med Ultrasonics 42, 505–512 (2015). https://doi.org/10.1007/s10396-015-0627-3
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DOI: https://doi.org/10.1007/s10396-015-0627-3