Computer auxiliary diagnosis technique of detecting cholangiocarcinoma based on medical imaging: A review
Graphical abstract
Section snippets
1. Introduction
As a common tumor, cholangiocarcinoma (CCA) originates from epithelial cells of the bile duct and has a high degree of malignancy [1]. Its location can range anywhere from the capillary bile duct to the common bile duct. As a malignant tumor second only to hepatocellular carcinoma (HCC), there has been a dramatic increase in its incidence rate in the past 40 years [2]. However, in contrast to the biological behavior of HCC, CCA is more likely to infiltrate into the bile duct wall and invade the
2. Publications search strategy and organization of the review
In this review, in order to search the publications relevant to CAD technique of detecting CCA based on medical imaging, we referred research publication databases consisting of SpringerTM, IEEEXploreTM, PubmedTM, ScienceDirectTM, Google ScholarTM, and WANFANG DATATM. These papers were screened against the background of medical imaging findings and artificial intelligence methods.
We applied a four-level screening process to determine the most suitable publications for this review. In the first
3. Imaging of cholangiocarcinoma
In clinical practice, the early-stage diagnosis of CCA is usually completed by medical imaging. CT scanning is the main modality for diagnosis and staging of CCA [17]. MRI can provide a detailed anatomical description of any vascular involvement of the bile duct [18]. Although US cannot be used for accurate staging, it plays an important role in early screening [19].
4. CAD of cholangiocarcinoma
In medical images, the output of a CAD system is obtained by quantitative analysis of the characteristics of relevant image data. Its function is to help radiologists improve the accuracy of diagnosis and the consistency of image and disease interpretation. Although its results can only be used as an auxiliary means, and diseases cannot be completely diagnosed by it, a CAD system can improve the accuracy of doctors' diagnosis. The reason is that, firstly, in traditional diagnostic methods, the
5. Discussion and future research
Medical imaging is increasingly used as an auxiliary method for the detection of CCA. However, currently, the application of AI technology in the auxiliary diagnosis of CCA has made some progress, but there remains a few shortcomings and limitations. In this section, we not only consider the pitfalls of existed CAD methods using medical images for detecting CCA but provide some potential directions to make CAD systems work better for further research.
There are three major subfields that can be
Conclusions
In this paper, we reviewed CAD techniques of detecting CCA based on medical imaging, including CT, MR, and US. We introduced algorithms and techniques used in image preprocessing, feature extraction and selection, classification, and performance estimation of a CAD system. Moreover, further improvement in CAD systems of CCA has a specific scope. We have provided a prediction of future trends, which will be of great significance for researchers in the medical imaging of both CCA and AI.
In
Declaration of Competing Interest
We declare that we do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.
Acknowledgments
This work was supported by the Shanghai Natural Science Foundation of China [Grant No. 19ZR1421500].
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