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New AI Algorithm Enhances Polyp Detection in Colonoscopy Procedures

By MedImaging International staff writers
Posted on 23 Nov 2018
Researchers at Shanghai Wision AI Co., Ltd. More...
(Shanghai, China), a developer of computer-aided diagnostic algorithms and systems to improve the accuracy and effectiveness of diagnostic imaging, have announced results of a study validating a novel machine-learning algorithm that improves detection of adenomatous polyps during colonoscopy. The AI algorithm is built on the same network architecture that is used to develop self-driving cars and is designed to enable “self-driving” in colonoscopy procedures.

The Wision AI algorithm was validated on large, prospectively developed datasets collected independently from the training dataset that were several-fold larger than the training dataset. This more rigorous validation approach utilized by Wision AI is meant to increase the performance of the algorithm in real-world clinical settings.

The algorithm was developed using 5,545 images (65.5% containing polyps and 34.5% without polyps) from the colonoscopy reports of 1,290 patients. Experienced endoscopists annotated the presence of polyps in all images used in the development dataset, and the algorithm was then validated on four independent datasets: two sets for image analysis (A and B) and two sets for video analysis (C and D). According to the study’s key findings, validation on dataset A, which included 27,113 images from patients undergoing colonoscopy at the Endoscopy Center of Sichuan Provincial People’s Hospital, found a per-image-sensitivity of 94.4% and a per-image-specificity of 95.9%. The per-image-sensitivity in a subset of 1,280 images with polyps that are typically hard to detect was 91.7%.

Validation on dataset B, based on a public database of 612 colonoscopy images acquired from the Hospital Clinic of Barcelona, found a per-image-sensitivity of 88.2%. The use of this dataset allowed for generalization of the validation data to a broader patient population. Validation on dataset C included a series of colonoscopy videos containing 138 polyps, found a per-image sensitivity of 91.6% among 60,914 frames of video, and a per-polyp sensitivity of 100%. Validation on dataset D, which contained 54 colonoscopy videos without any polyps, found a per-image-specificity of 95.4% among 1,072,483 frames. The total processing time for each image frame was 76.8 milliseconds, including preprocessing and displaying times before and after execution of the deep-learning algorithm. Implementation in a real-time system resulted in a processing rate of 30 frames per second with Nvidia Titan X GPUs.

Based on these findings, the researchers concluded that the automatic polyp-detection system based on deep learning has a high overall performance in both colonoscopy images and real-time videos.

“The results of this study demonstrate the power of our rigorous approach to developing deep-learning algorithms, which utilizes distinct datasets for training and validation and results in high levels of specificity and sensitivity that have the potential to improve diagnostic screening methods that are known to reduce disease risk, improve health outcomes and save lives,” said JingJia Liu, CEO at Wision AI.

Related Links:
Shanghai Wision AI


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89 (45.061111450195): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (30.040740966797): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
91 (35.04753112793): SELECT id,name,title FROM jos_deeppockets WHERE cat=10 AND TYPE='file_folder' AND published=1 AND id != 294743300 AND id != 294743301 AND id != 294743302 AND id != 294743303 AND id != 294743304 AND id != 294743305 AND id != 294743306 AND id != 294743307 AND id != 294743308 AND id != 294743309 AND id != 294743310 AND metakey != 'aacc' ORDER BY `ordering`
92 (49.114227294922): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
107 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
108 (51.021575927734): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (46.968460083008): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (70.810317993164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
111 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
112 (46.968460083008): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (569.10514831543): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (527.85873413086): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
115 (313.04359436035): SELECT dp.name, dp.id, dp2.name as channel, ex.name as author_name, ex.specialization, ex.images FROM jos_deeppockets as dp LEFT JOIN jos_experts as ex ON ex.id = dp.author LEFT JOIN jos_deeppockets as dp2 ON dp2.id = dp.fid WHERE dp.author != 0 AND dp.cat = 10 AND dp.published = 1 AND ( (dp.fid = 294743300) OR (dp.fid = 294743301) OR (dp.fid = 294743302) OR (dp.fid = 294743303) OR (dp.fid = 294743304) OR (dp.fid = 294743305) OR (dp.fid = 294743306) OR (dp.fid = 294743307) OR (dp.fid = 294743308) OR (dp.fid = 294743309) OR (dp.fid = 294743310) ) ORDER BY RAND() LIMIT 1
116 (111.81831359863): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
117 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
118 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
119 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
120 (44.822692871094): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
121 (35.04753112793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
122 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
123 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
124 (316.14303588867): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 20596.027374268): SELECT * FROM jos_deeppockets WHERE jos_deeppockets.cat = 10 AND jos_deeppockets.type = 'deeppockets_item' AND jos_deeppockets.published = 1 AND jos_deeppockets.created + INTERVAL 14 DAY >= NOW() ORDER BY jos_deeppockets.hits DESC LIMIT 7
126 (552.89268493652): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294775820 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294775820 AND type='deeppockets_item' AND published='1' LIMIT 1
127 (!!!!! 7272.9587554932): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
128 (72.956085205078): ( SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.video != '' AND dp.video_source != '' AND dp.cat = 10 AND dp.published = 1 AND dp.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) UNION ( SELECT dpa.id, dpa.name, dpa.title, dpa.video, dpa.video_source, dpa.created FROM jos_deeppockets_archive AS dpa WHERE dpa.video != '' AND dpa.video_source != '' AND dpa.cat = 10 AND dpa.published = 1 AND dpa.type != 'deeppockets_item_link' ORDER BY created DESC LIMIT 3 ) ORDER BY created DESC LIMIT 3
129 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
130 (29.087066650391): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803337 LIMIT 1
131 (44.107437133789): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
132 (29.087066650391): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294803276 LIMIT 1
133 (375.03242492676): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
134 (46.014785766602): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets_archive AS dp WHERE dp.id = 294803276 LIMIT 1
135 (36.954879760742): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
136 (28.848648071289): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294802958 LIMIT 1
137 (672.81723022461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (498.05641174316): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (62.942504882812): SELECT name FROM jos_deeppockets WHERE id=217
140 (41.961669921875): SELECT name FROM jos_deeppockets WHERE id=217
141 (!!!!! 1399.040222168): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))217((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (728.84559631348): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))217((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
144 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
145 (!!!!! 9881.9732666016): TRUNCATE TABLE jos_trademed_module
146 (137.8059387207): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (85.830688476562): SELECT dp.*, ch.title as channel, exp.name as author_name, exp.specialization as author_specialization, exp.images as author_photo FROM jos_deeppockets_archive as dp LEFT JOIN jos_experts as exp ON exp.id = dp.author LEFT JOIN jos_deeppockets as ch ON dp.fid = ch.id WHERE 1=1 AND dp.cat=10 AND dp.id=294775820 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (788.92707824707): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (94.175338745117): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
151 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
152 (!!!!! 1619.1005706787): SELECT jos_item.* FROM jos_item INNER JOIN jos_number ON jos_item.numberID=jos_number.id WHERE 1=1 AND (jos_item.imgMini<>'') AND jos_item.type='L' AND jos_item.numberID= ( SELECT jos_number.id FROM jos_number WHERE jos_number.journalID IN (10) and jos_number.id in (select distinct jos_number.id from jos_number join jos_item on jos_item.numberid=jos_number.id where jos_item.type='P') ORDER BY (CONVERT(SUBSTRING(issue,1,2),SIGNED) + (CONVERT(SUBSTRING(issue,3,2),SIGNED)*100)) DESC LIMIT 0,1 ) ORDER BY RAND() DESC LIMIT 6
153 (97.036361694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
154 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
155 (60.081481933594): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294775820 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294775820 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (82.969665527344): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=217 or channel_id is null)
157 (49.114227294922): select distinct links.* from jos_textlinks links join jos_textlinks_placement placement on links.id=placement.link_id where journal_id=(10) and (channel_id=217 or channel_id is null)
158 (54.121017456055): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
160 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294775820 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294775820 AND published='1' LIMIT 1
161 (71.048736572266): select jos_twitters.link from jos_twitters where cat=10
162 (46.968460083008): select jos_facebook.link from jos_facebook where cat=10
163 (41.961669921875): select jos_google_plus.link from jos_google_plus where cat=10
164 (39.100646972656): select jos_linkedin.link from jos_linkedin where cat=10