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Self-Learning Algorithms Could Improve AI-Based Evaluation of Medical Imaging Data

By MedImaging International staff writers
Posted on 22 Dec 2020
Scientists have presented a new method for configuring self-learning algorithms for a large number of different imaging datasets – without the need for specialist knowledge or very significant computing power.

In the evaluation of medical imaging data, artificial intelligence (AI) promises to provide support to physicians and help relieve their workload, particularly in the field of oncology. Yet regardless of whether the size of a brain tumor needs to be measured in order to plan treatment or the regression of lung metastases needs to be documented during the course of radiotherapy, computers first have to learn how to interpret the three-dimensional imaging datasets from computed tomography (CT) or magnetic resonance imaging (MRI). They must be able to decide which pixels belong to the tumor and which do not.

AI experts refer to the process of distinguishing between the two as 'semantic segmentation'. For each individual task – for example recognizing a renal carcinoma on CT images or breast cancer on MRI images – scientists need to develop special algorithms that can distinguish between tumor and non-tumor tissue and can make predictions. Imaging datasets for which physicians have already labeled tumors, healthy tissue, and other important anatomical structures by hand are used as training material for machine learning. It takes experience and specialized knowledge to develop segmentation algorithms such as these.

Scientists from the German Cancer Research Center (DKFZ; Heidelberg, Germany) have now developed a method that adapts dynamically and completely automatically to any kind of imaging datasets, thus allowing even researchers with limited prior expertise to configure self-learning algorithms for specific tasks. The method, known as nnU-Net, can deal with a broad range of imaging data: in addition to conventional imaging methods such as CT and MRI, it can also process images from electron and fluorescence microscopy. Using nnU-Net, the DKFZ researchers obtained the best results in 33 out of 53 different segmentation tasks in international competitions, despite competing against highly specific algorithms developed by experts for specific individual questions. The team is making nnU-Net available as an open source tool to be downloaded free of charge.

So far, AI-based evaluation of medical imaging data has mainly been applied in research contexts and has not yet been broadly used in the routine clinical care of cancer patients. However, medical informatics specialists and physicians see considerable potential for its use, for example for highly repetitive tasks, such as those that often need to be performed as part of large-scale clinical studies. nnU-Net can help harness this potential, according to the scientists.

"nnU-Net can be used immediately, can be trained using imaging datasets, and can perform special tasks – without requiring any special expertise in computer science or any particularly significant computing power," explained Klaus Maier-Hein.


Related Links:
German Cancer Research Center (DKFZ)


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90 (52.928924560547): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (82.969665527344): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
92 (42.915344238281): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
93 (48.160552978516): 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`
94 (76.055526733398): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (25.033950805664): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (23.841857910156): SELECT show_live FROM jos_com_show_setting LIMIT 1
107 (25.98762512207): SELECT show_live FROM jos_com_show_setting LIMIT 1
108 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
109 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
110 (54.836273193359): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (47.922134399414): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (179.05235290527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
113 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
114 (49.114227294922): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (420.80879211426): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (607.96737670898): 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
117 (335.2165222168): 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
118 (113.01040649414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
119 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
120 (185.96649169922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
121 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
122 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
123 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
124 (256.06155395508): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 44651.031494141): 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 (231.98127746582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
127 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
128 (!!!!! 1055.0022125244): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294786250 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294786250 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 863815.06919861): ( 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
130 (98.943710327148): ( 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
131 (53.167343139648): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
132 (36.954879760742): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
133 (56.982040405273): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
134 (37.193298339844): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
135 (33.855438232422): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
136 (62.942504882812): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
137 (669.00253295898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (416.99409484863): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (262.02201843262): SELECT name FROM jos_deeppockets WHERE id=217
140 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=217
141 (489.95018005371): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (478.98292541504): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))217((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (64.849853515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
144 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
145 (!!!!! 9354.1145324707): TRUNCATE TABLE jos_trademed_module
146 (119.20928955078): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (58.174133300781): 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=294786250 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (963.92631530762): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (85.830688476562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
151 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
152 (!!!!! 1186.8476867676): 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 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
154 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
155 (46.968460083008): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294786250 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294786250 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (36.001205444336): 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 (32.186508178711): 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 (32.901763916016): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (148.05793762207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
160 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294786250 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294786250 AND published='1' LIMIT 1
161 (54.836273193359): select jos_twitters.link from jos_twitters where cat=10
162 (39.815902709961): select jos_facebook.link from jos_facebook where cat=10
163 (40.054321289062): select jos_google_plus.link from jos_google_plus where cat=10
164 (31.948089599609): select jos_linkedin.link from jos_linkedin where cat=10
165 (255.10787963867): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 1460.075378418): insert into jos_banners_delta values (14615,'2025-05-01 03:14:26','13.58.25.33','view'),(14202,'2025-05-01 03:14:26','13.58.25.33','view'),(14203,'2025-05-01 03:14:26','13.58.25.33','view')