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New AI Model Based on 3D CT Scans Improves Accuracy of Machine Learning in COVID-19 Diagnosis

By MedImaging International staff writers
Posted on 17 Dec 2021
Illustration
Illustration

Researchers have developed an artificial intelligence (AI) model that can diagnose COVID-19 as well as a panel of professional radiologists, while preserving the privacy of patient data.

An international team of researchers, led by the University of Cambridge (Cambridge, England) and the Huazhong University of Science and Technology (Hubei, China), used a technique called federated learning to build their model. Using federated learning, an AI model in one hospital or country can be independently trained and verified using a dataset from another hospital or country, without data sharing. The researchers based their model on more than 9,000 CT scans from approximately 3,300 patients in 23 hospitals in the UK and China. Their results provide a framework where AI techniques can be made more trustworthy and accurate, especially in areas such as medical diagnosis where privacy is vital.

AI has provided a promising solution for streamlining COVID-19 diagnoses and future public health crises. However, concerns surrounding security and trustworthiness impede the collection of large-scale representative medical data, posing a challenge for training a model that can be used worldwide. In the early days of the COVID-19 pandemic, many AI researchers worked to develop models that could diagnose the disease. However, many of these models were built using low-quality data, ‘Frankenstein’ datasets, and a lack of input from clinicians. Many of the same researchers from the current study highlighted that these earlier models were not fit for clinical use in the spring of 2021.

The international team of researchers used two well-curated external validation datasets of appropriate size to test their model and ensure that it would work well on datasets from different hospitals or countries. The researchers based their framework on three-dimensional CT scans instead of two-dimensional images. CT scans offer a much higher level of detail, resulting in a better model. They used 9,573 CT scans from 3,336 patients collected from 23 hospitals located in China and the UK.

The researchers also had to mitigate for bias caused by the different datasets, and used federated learning to train a better generalized AI model, while preserving the privacy of each data centre in a collaborative setting. For a fair comparison, the researchers validated all the models on the same data, without overlapping with the training data. The team had a panel of radiologists make diagnostic predictions based on the same set of CT scans, and compared the accuracy of the AI models and human professionals. The researchers say their model is useful not just for COVID-19, but for any other diseases that can be diagnosed using a CT scan.

“AI has a lot of limitations when it comes to COVID-19 diagnosis, and we need to carefully screen and curate the data so that we end up with a model that works and is trustworthy,” said co-first author Hanchen Wang from Cambridge’s Department of Engineering.

“Before COVID-19, people didn’t realize just how much data you needed to collect in order to build medical AI applications,” said co-author Dr. Michael Roberts from AstraZeneca and Cambridge’s Department of Applied Mathematics and Theoretical Physics. “Different hospitals, different countries all have their own ways of doing things, so you need the datasets to be as large as possible in order to make something that will be useful to the widest range of clinicians.”

Related Links:
University of Cambridge
Huazhong University of Science and Technology

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90 (38.862228393555): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294790991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
91 (84.161758422852): 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 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (42.200088500977): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
107 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
108 (69.856643676758): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (56.982040405273): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
110 (102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
111 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
112 (430.10711669922): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (460.14785766602): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
114 (69.856643676758): 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=294790986 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (495.19538879395): 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=294790986 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (734.09080505371): 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 (472.06878662109): 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 (133.99124145508): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
119 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
120 (95.844268798828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
121 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
122 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
123 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
124 (375.98609924316): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 34455.060958862): 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 (109.91096496582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
127 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
128 (542.16384887695): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294790991 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294790991 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 735117.91229248): ( 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 (89.883804321289): ( 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 (52.928924560547): 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 (39.100646972656): 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 (54.121017456055): 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 (37.908554077148): 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 (36.954879760742): 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 (36.001205444336): 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 (491.14227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (308.99047851562): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (220.06034851074): SELECT name FROM jos_deeppockets WHERE id=215
140 (43.869018554688): SELECT name FROM jos_deeppockets WHERE id=215
141 (574.11193847656): 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 '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (485.18180847168): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
144 (60.796737670898): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
145 (!!!!! 9891.9868469238): TRUNCATE TABLE jos_trademed_module
146 (123.02398681641): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (69.856643676758): 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=294790991 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (!!!!! 1103.1627655029): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (75.101852416992): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
151 (92.983245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
152 (!!!!! 1398.8018035889): 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 (77.009201049805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
154 (65.803527832031): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
155 (56.028366088867): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294790991 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294790991 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (45.061111450195): 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=0 or channel_id is null)
157 (42.915344238281): 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=0 or channel_id is null)
158 (46.014785766602): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (145.91217041016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
160 (219.10667419434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294790991 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294790991 AND published='1' LIMIT 1
161 (47.922134399414): select jos_twitters.link from jos_twitters where cat=10
162 (35.04753112793): select jos_facebook.link from jos_facebook where cat=10
163 (36.001205444336): select jos_google_plus.link from jos_google_plus where cat=10
164 (34.809112548828): select jos_linkedin.link from jos_linkedin where cat=10
165 (365.9725189209): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 2087.8314971924): insert into jos_banners_delta values (14615,'2025-06-18 01:42:03','216.73.216.120','view'),(14202,'2025-06-18 01:42:03','216.73.216.120','view'),(14203,'2025-06-18 01:42:03','216.73.216.120','view')