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New Model Detects Long-COVID’s Effects Using Simple, 2D Chest X-Rays

By MedImaging International staff writers
Posted on 03 Nov 2022

For patients dealing with lingering respiratory symptoms from the novel coronavirus, a chest X-ray can reveal only so much. The two-dimensional (2D) scans simply cannot distinguish compromised lung function. For that diagnosis, a more expensive, three-dimensional (3D) technique called a CT scan is necessary. Yet many medical clinics do not have CT scanning equipment, leaving so-called long-COVID patients with little information about their lung function. But that may change. Researchers have developed what is called a contrastive learning model that “learns” from composite 2D images constructed from 3D CT images to detect compromised lung function in long-COVID patients. Another technique, called transfer learning, then conveys lung diagnostic information from a CT scan to a chest X-ray, thus allowing chest X-ray equipment to detect abnormalities the same as if those patients had used a CT scan.

In the study, the researchers at the University of Iowa (Iowa City, IA, USA) showed how their contrastive learning model could be applied to detect small airways disease, which is an early stage of compromised lung function in long-COVID patients. Of the long-COVID patients, the models were advanced enough to distinguish the severity of the compromised lung function, separating those with small airways disease from those with more advanced respiratory issues.

The researchers based their modeling on CT scans of 100 people who were infected with the original COVID strain and went for diagnosis for breathing problems between June and December 2020. Many of these long-COVID patients had small airways disease, which affects a network of more than 10,000 tubes at the nexus in the lung where oxygenated air mixes with blood to be carried throughout the body. People with small airways disease have many of these vessels constricted, thus limiting the oxygen-blood exchange in the lungs, and impeding breathing overall.

The researchers collected data points at two intervals in the CT lung scans - when the patient inhaled and when the patient exhaled. The researchers compared their results with a control group that had not contracted the virus as they created the contrastive learning model. The researchers also advanced the model so it could separate patients with small airways disease from those with more advanced complications, such as emphysema. The researchers note the study is limited, in part because the sample size is small, and the patients are from a single medical facility. A larger sample size, they write, may uncover more variations in lung function stemming from long COVID.

“The study demonstrated in an independent way that patients with post-COVID have two types of lung injuries (small airway disease and lung parenchyma fibrosis/inflammation) that are persistent after having recovered from their initial SARS CoV-2 infection,” said Alejandro Comellas, clinical professor of internal medicine–pulmonary, critical care, and occupational medicine, and a co-author on this study.

“The new element to the model is taking information from 3D CT scans showing lung volume and transferring that information to a model that will show these same characteristics in 2D images,” said Ching-Long Lin, Edward M. Mielnik and Samuel R. Harding professor and chair of the Department of Mechanical Engineering in the College of Engineering at Iowa. “Clinicians would be able to use chest X-rays to detect these outcomes. That’s the bigger perspective.”

“Chest X-rays are accessible, while CT scans are more expensive and not as accessible,” Lin added. “Our model can be further improved, and I believe there is potential for it to be used at all clinics without having to buy expensive imaging equipment, such as CT scanners.”

Related Links:
University of Iowa 

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83 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
84 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
85 (39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1
86 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
89 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
90 (73.909759521484): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (61.988830566406): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
92 (40.054321289062): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
93 (41.007995605469): 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 (211.00044250488): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (82.015991210938): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (106.8115234375): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (124.93133544922): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (55.789947509766): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (69.856643676758): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (58.174133300781): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (63.180923461914): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (90.122222900391): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (82.969665527344): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (70.810317993164): SELECT show_live FROM jos_com_show_setting LIMIT 1
107 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
108 (509.97734069824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
109 (109.19570922852): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
110 (137.0906829834): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (57.93571472168): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 3676.176071167): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
113 (113.96408081055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
114 (68.902969360352): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (498.05641174316): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (889.06288146973): 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 (559.09156799316): 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 (114.91775512695): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
119 (86.069107055664): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
120 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
121 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
122 (95.844268798828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
123 (95.129013061523): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
124 (446.08116149902): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
125 (!!!!! 76618.909835815): 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 (274.8966217041): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
127 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
128 (!!!!! 3857.8510284424): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294795164 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294795164 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 749936.1038208): ( 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 (100.13580322266): ( 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 (393.15223693848): 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 (45.061111450195): 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 (287.05596923828): 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 (39.100646972656): 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 (191.92695617676): 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 (79.154968261719): 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 (519.99092102051): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (360.96572875977): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
139 (263.92936706543): SELECT name FROM jos_deeppockets WHERE id=211
140 (34.809112548828): SELECT name FROM jos_deeppockets WHERE id=211
141 (534.0576171875): 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 '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (487.08915710449): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))211((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
143 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
144 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
145 (!!!!! 8871.0784912109): TRUNCATE TABLE jos_trademed_module
146 (151.15737915039): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (66.995620727539): 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=294795164 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
148 (482.08236694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
150 (57.93571472168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
151 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
152 (!!!!! 1239.0613555908): 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 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
154 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
155 (90.122222900391): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294795164 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294795164 AND type='deeppockets_item' AND published='1' LIMIT 1
156 (40.054321289062): 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=211 or channel_id is null)
157 (31.948089599609): 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=211 or channel_id is null)
158 (56.982040405273): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
159 (131.13021850586): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
160 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294795164 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294795164 AND published='1' LIMIT 1
161 (122.0703125): select jos_twitters.link from jos_twitters where cat=10
162 (33.140182495117): 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 (37.908554077148): select jos_linkedin.link from jos_linkedin where cat=10
165 (319.00405883789): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
166 (!!!!! 1470.0889587402): insert into jos_banners_delta values (14615,'2025-04-30 07:48:14','18.118.187.83','view'),(14202,'2025-04-30 07:48:14','18.118.187.83','view'),(14203,'2025-04-30 07:48:14','18.118.187.83','view')