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Computational Imaging Technique Creates 3D Model of Mammal Lung Image

By MedImaging International staff writers
Posted on 16 Oct 2012
Image: Lung maze modeled in 3D (Photo courtesy of Dragos Vasilescu, University of Iowa and the University of British Columbia).
Image: Lung maze modeled in 3D (Photo courtesy of Dragos Vasilescu, University of Iowa and the University of British Columbia).
Scientists are trying to determine more precisely what occurs in the lung’s minuscule, convoluted network of corridors. To accomplish this goal, investigators have created the most detailed, three-dimensional (3D) rendering of the ending of all the pathways in the lung, called the pulmonary acinus.

The computerized model, derived from mice, authentically imitates the curves in this area, including the direction, length, and angles of the respiratory branches that lead to the air sacs called alveoli. “The imaging and image analysis methods described here provide for branch morphometry at the acinar level that has not been available previously,” the researchers, from the University of Iowa (UI; Iowa City, USA), wrote in their article, published in October 2012 in the online early edition of the Proceedings of the National Academy of Sciences of the United States of America (PNAS).

The model is significant because it can help scientists understand where and how lung diseases emerge as well as the role the pulmonary acinus plays in drug delivery, such as those typically administered with inhalers. “These methods allow us to understand where in the lung periphery disease begins and how it progresses,” said Dr. Eric Hoffman, professor in the departments of radiology, medicine, and biomedical engineering at the UI and corresponding author of the article. “How do gases and inhaled substances get there and do they accumulate in one or another acinus? How do they swirl around and clear out? We just don’t have a complete understanding how that happens.”

For instance, Dr. Hoffman reported that the model could be utilized to determine how smoking-induced emphysema begins. “It has been hypothesized recently that it begins with the loss of peripheral airways rather than the lung air sacs,” he said, mentioning ongoing research by Dr. James Hogg at the University of British Columbia (Vancouver, BC, Canada), who was not involved in this study. It also could provide insights and lead to more effective treatment of chronic obstructive pulmonary disease, which causes irreversible damage to the lung, noted Dr. Dragos Vasilescu, first author on the paper who based his thesis on the research while a graduate student at the UI.

The best, up to now, that lung anatomy specialists such as study co-corresponding author Dr. Ewald Weibel, professor emeritus of anatomy at the University of Bern (Switzerland), could do to study specific areas of a lung was to make measurements in two dimensions or create 3D casts of a lung’s air spaces. The techniques, while offering the first clues into a lung’s composition workings, had their limitations. For instance, they did not directly replicate a lung’s structure in real life, and they could not determine how various parts act together as a whole. However, developments in imaging and computer science have enabled researchers to better study how gases and other inhaled substances act in the lung’s farthest recesses.

In this study, the investigators worked with 22 pulmonary acini taken from young and old mice. They then “reconstructed” the acini based on microcomputed tomography (CT) imaging of scanned lungs in mice and extracted from them. The extracted lungs were preserved in a way that kept the anatomy intact--including the tiny air spaces required for effective imaging. From that, the researchers were able to measure an acinus, estimate the number of acini for each mouse lung, and count the alveoli and measure their surface area.

The mouse lung, in its structure and function, is remarkably similar to the human lung. That means researchers can alter the genetics of a mouse and see how those changes affect the peripheral structure of the lung and its performance. The researchers discovered that mouse alveoli increase in number a long past the two weeks that at least one earlier study had indicated. Dr. Hoffman added that more research is required to determine whether if humans also increase the number of air sacs after a specific, predetermined age.

The researcher’s next objective is to utilize the mouse model to more precisely determine how gases interact with the bloodstream within the acini and the alveoli. “Our imaging and image-analysis methodologies enable new ways to investigate the lung’s structure and can now be used to further investigate the normal healthy-lung anatomy in humans and be used to visualize and assess the pathological changes in animal models of specific structural diseases,” said Dr. Vasilescu, who is a postdoctoral research fellow at the University of British Columbia.

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87 (41.007995605469): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (27.179718017578): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (31.948089599609): 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`
90 (65.088272094727): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (63.180923461914): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
105 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
106 (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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (46.014785766602): 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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
109 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
110 (45.061111450195): 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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (399.11270141602): 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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (532.86552429199): 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
113 (311.85150146484): 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
114 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
115 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
116 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
117 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
118 (93.936920166016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
119 (39.100646972656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
120 (291.10908508301): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 20785.093307495): 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
122 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
123 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
124 (385.99967956543): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742960 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742960 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 454684.01908875): ( 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
126 (75.101852416992): ( 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
127 (281.09550476074): 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
128 (87.976455688477): 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
129 (236.98806762695): 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
130 (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
131 (177.86026000977): 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
132 (32.186508178711): 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
133 (451.08795166016): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (339.98489379883): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (192.88063049316): SELECT name FROM jos_deeppockets WHERE id=216
136 (31.948089599609): SELECT name FROM jos_deeppockets WHERE id=216
137 (421.04721069336): 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 '((;)|(^))216((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (384.80758666992): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))216((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
140 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
141 (!!!!! 8941.8888092041): TRUNCATE TABLE jos_trademed_module
142 (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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (55.074691772461): 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=294742960 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (831.12716674805): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
147 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
148 (!!!!! 1510.1432800293): 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
149 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
150 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
151 (57.93571472168): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294742960 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294742960 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (38.862228393555): 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=216 or channel_id is null)
153 (34.093856811523): 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=216 or channel_id is null)
154 (46.014785766602): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (164.98565673828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
156 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294742960 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294742960 AND published='1' LIMIT 1
157 (107.0499420166): select jos_twitters.link from jos_twitters where cat=10
158 (27.894973754883): select jos_facebook.link from jos_facebook where cat=10
159 (34.093856811523): select jos_google_plus.link from jos_google_plus where cat=10
160 (33.140182495117): select jos_linkedin.link from jos_linkedin where cat=10
161 (280.14183044434): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 2023.9353179932): insert into jos_banners_delta values (14615,'2025-06-18 22:25:40','216.73.216.120','view'),(14202,'2025-06-18 22:25:40','216.73.216.120','view'),(14203,'2025-06-18 22:25:40','216.73.216.120','view')