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Ultrasound Offers New Approach to Measure Lung Fluid

By MedImaging International staff writers
Posted on 01 Jun 2017
A new study suggests that ultrasound may offer a noninvasive way to track and monitor pulmonary edema, which often affects patients with congestive heart failure (CHF).

Developed by researchers at North Carolina State University and the University of North Carolina, the new technique uses ultrasound multiple scattering and exploits the complexity of ultrasound propagation in the lung structure in order to characterize the micro-architecture of the lung parenchyma. More...
The experimental setup consisted of a linear transducer array with an 8-MHz central frequency, which was placed in contact with the lung surface.

When conventional ultrasound waves hit air, the energy is scattered; this occurs multiple times in alveoli, resulting in an amorphous grey image with little useful information. This reflection process means that it takes an ultrasound’s echo much longer to return back to the ultrasound machine. But since no two ultrasound waves take the same path, their echoes take different amounts of time to return to the scanner. By examining all of the returning echoes and how they change over time, the extent to which the space between the alveoli is filled with fluid can be measured.

To test their approach, the researchers conducted two sets of experiments using rats. In the first set, the researchers used lung tissue that had been injected with saline solution to mimic fluid-filled lungs. The new approach allowed the researchers to quantify the amount of lung fluid to within one milliliter. In the second set, the researchers measured the mean distance between two ultrasound scattering events. They found that in fluid-filled lungs, the mean distance was 1,040 micrometers, whereas the mean distance in healthy lungs was only 332 micrometers. The study was published on March 18, 2017, in Ultrasound in Medicine and Biology.

“Historically, it has been difficult to use ultrasound to collect quantitative information on the lung, because ultrasound waves don’t travel through air– and the lung is full of air,” said senior author mechanical engineer Marie Muller, PhD, of NCSU. “However, we’ve been able to use the reflective nature of air pockets in the lung to calculate the amount of fluid in the lung. This is important, because one could potentially track this mean distance value as a way of determining how well pulmonary edema treatment is working.”

Pulmonary edema is fluid accumulation in the tissue and air spaces of the lungs, and is a cardinal feature of CHF. It leads to impaired gas exchange and may cause respiratory failure. It is due to either failure of the left ventricle of the heart to remove blood adequately from the pulmonary circulation (cardiogenic pulmonary edema), or an injury to the lung parenchyma or vasculature of the lung (noncardiogenic pulmonary edema). Treatment is focused on three aspects: improving respiratory function, treating the underlying cause, and avoiding further damage to the lung.


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90 (50.067901611328): 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`
91 (61.03515625): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (74.148178100586): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (34.809112548828): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
106 (78.916549682617): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
107 (77.009201049805): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (67.949295043945): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
110 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
111 (71.048736572266): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (808.0005645752): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (713.82522583008): 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 (478.98292541504): 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 (154.97207641602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
116 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
117 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
118 (55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
119 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
120 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
121 (54.836273193359): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
122 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
123 (391.96014404297): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 30002.117156982): 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
125 (628.94821166992): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294769448 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294769448 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 10481.119155884): ( 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 (138.99803161621): ( 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 (49.829483032227): 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
129 (40.054321289062): 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 (56.982040405273): 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
131 (39.815902709961): 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 (401.02005004883): 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
133 (83.92333984375): 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 AS dp WHERE dp.id = 294802958 LIMIT 1
135 (37.908554077148): 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 (602.00691223145): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (469.92301940918): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (48.160552978516): SELECT name FROM jos_deeppockets WHERE id=214
139 (37.908554077148): SELECT name FROM jos_deeppockets WHERE id=214
140 (720.97778320312): 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 '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (650.88272094727): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
143 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
144 (!!!!! 10486.841201782): TRUNCATE TABLE jos_trademed_module
145 (128.03077697754): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (75.817108154297): 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=294769448 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (!!!!! 1157.0453643799): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (75.817108154297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
150 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
151 (!!!!! 1561.8801116943): 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
152 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
153 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
154 (47.922134399414): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294769448 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294769448 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (43.869018554688): 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=214 or channel_id is null)
156 (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=214 or channel_id is null)
157 (42.915344238281): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (102.99682617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
159 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294769448 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294769448 AND published='1' LIMIT 1
160 (46.968460083008): select jos_twitters.link from jos_twitters where cat=10
161 (38.14697265625): select jos_facebook.link from jos_facebook where cat=10
162 (37.908554077148): select jos_google_plus.link from jos_google_plus where cat=10
163 (38.14697265625): select jos_linkedin.link from jos_linkedin where cat=10