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George et al. Mini-invasive Surg 2024;8:4  https://dx.doi.org/10.20517/2574-1225.2023.102                                                                             Page 15 of 23


                              Table 5. Table of AI applications in capsule endoscopy for inflammatory bowel disease

                                                                Year of       Study        Study                                                                                     AI
                              Ref.              Application                                             Aim and goals                              Training/Validation dataset              Results
                                                                publication   design       location                                                                                  type
                              Haji-Maghsoudi    Inflammatory    2012          Retrospective Iran        Develop method for the detection of        Stenosis: 45 images               CED    Crohn’s: sensitivity of
                                  [79]
                              et al.            bowel disease                                           lymphangiodysplasia, xanthoma, CD, and     CD: 74 images                            89.32%,
                                                                                                        stenosis in WCE image                      Lymphangiectasia: 32 images              specificity of 65.37%
                                                                                                                                                   Lymphoid hyperplasia: 27 images          Stenosis: sensitivity of
                                                                                                                                                   Xanthoma: 28 images                      91.27%,
                                                                                                                                                                                            specificity of 87.27%
                                                                                                                                                                                            Lymphangiectasia:
                                                                                                                                                                                            sensitivity of 95.45%,
                                                                                                                                                                                            specificity of 94.1%
                                                                                                                                                                                            Lymphoid: sensitivity of
                                                                                                                                                                                            87.01%,
                                                                                                                                                                                            specificity of 79.71%
                                                                                                                                                                                            Xanthoma: sensitivity of
                                                                                                                                                                                            97%,
                                                                                                                                                                                            specificity of 97.13%
                                        [78]
                              Kumar et al.      Inflammatory    2012          Retrospective United States  Constructing classifier cascade for classifying   Training: 355 images    SVM    Sensitivity over 90% was
                                                bowel disease                              of America   CD lesions into normal, mild, and severe   Testing: 212 normal images, 213 mild,    found
                                                                                                                                                   108 severe images

                              Charisis and      Inflammatory    2016          Retrospective Greece      Utilise novel feature extraction method for   Database of 466 normal images and   SVM  Sensitivity of 95.2%,
                              Hadjileontiadis [80]  bowel disease                                       detecting CD lesions                       436 CD images                            specificity of 92.4%
                              de Maissin        Inflammatory    2018          Retrospective France      Develop CNN for automatic detection of SB CD   Training: 589 images          CNN    Sensitivity of 62.18%,
                                  [82]
                              et al.            bowel disease                                           lesions                                    Testing: 73 images                       specificity of 66.81%
                                       [83]
                              Klang et al.      Inflammatory    2019          Retrospective Israel      Utilise CNN for CD monitoring and diagnosis by  Training: 1,090 images       CNN    Sensitivity of 96.9%,
                                                bowel disease                                           SB ulcer detection                         Testing: 273 images                      specificity of 96.6%
                                        [81]
                              Barash et al.     Inflammatory    2020          Retrospective Israel      Automatic severity grading of CD ulcers into   Training: 1,242 images        CNN    Sensitivity of 71%,
                                                bowel disease                                           grades 1 to 3                              Testing: 248 images                      specificity of 34%
                                       [84]
                              Klang et al.      Inflammatory    2020          Retrospective Israel      Construction of CNN to differentiate normal and  Training: 14,112 images     CNN    Sensitivity of 97.1%,
                                                bowel disease                                           ulcerated mucosa                           Testing: 3,528 images                    specificity of 96%
                              de Maissin        Inflammatory    2021          Retrospective France      Assessing importance of annotation quality on   Database of 3,498 images was   RANN Sensitivity of 93%,
                                  [85]
                              et al.            bowel disease                                           CNN                                        annotated by different readers for       specificity of 95%
                                                                                                                                                   different trials
                                                Inflammatory    2021          Retrospective Israel      Identify intestinal strictures on CE images from   Database of 1,942 stricture images,   CNN  Sensitivity of 92%,
                                       [86]
                              Klang et al.      bowel disease                                           CD patients                                14,266 normal mucosa images,             specificity of 89%
                                                                                                                                                   7,075 mild ulcer images,
                                                                                                                                                   2,386 moderate ulcer images,
                                                                                                                                                   2,223 severe ulcer images used for
                                                                                                                                                   training and testing
                                       [87]
                              Klang et al.      Inflammatory    2021          Retrospective Israel      Identify NSAID ulcers, which are common    Training: 7,391 CD mucosal ulcer   CNN   Sensitivity of 92%,
                                                bowel disease                                           differentials for CD ulcers on CE images   images,                                  specificity of 95%
                                                                                                                                                   10,249 normal mucosa
                                                                                                                                                   Testing: 980 NSAIDs ulcer images,
   47   48   49   50   51   52   53   54   55   56   57