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Noninvasive Imaging Technique Devised to Map Electrical Activation of the Heart Directly

By MedImaging International staff writers
Posted on 06 Jun 2011
Abnormalities in cardiac conduction, the rate at which the heart conducts electrical impulses to contract and relax, are a major cause of death and disability worldwide. More...
Researchers have been developing a new method, called electromechanical wave imaging (EWI) that is the first noninvasive technique to map the electrical activation of the heart. Based on ultrasound imaging, EWI will enable clinicians to treat arrhythmias more effectively and precisely.

The study's findings were published online in the May 9, 2011, in the journal Proceedings of the [US] National Academy of Sciences. Up until now, other research groups have mostly focused on measuring the electrical activation directly but invasively, through electrode contact, or noninvasively but indirectly, through complex mathematical modeling based on remote measurements. "This is an important breakthrough," said Dr. Elisa Konofagou, who led the research, and is an associate professor of biomedical engineering and radiology at Columbia University's Fu Foundation School of Engineering and Applied Science (New York, NY, USA). "The approach we have chosen--to look at the minute deformations following the electrical activation of the heart--is both direct and noninvasive. Electromechanical Wave Imaging is also eminently translational as it can be incorporated into most ultrasound scanners already available in hospitals and clinics, and can be modified at little or no cost to use our technology."

Using their EWI method, the Columbia engineering team imaged the heart with ultrasound five times faster than standard echocardiography and mapped the local deformations of the heart with their images. The researchers then looked at small regions of the heart (just a few millimeters squared) and measured how much these regions were stretched or compressed every 0.002 seconds. This enabled them to precisely identify at what time each region of the heart began to contract (the electromechanical activation) in all four chambers of the heart. They compared their maps with the electrical activation sequence and found they were closely correlated, at both the natural rhythm of the heart and when the heart was artificially paced.

Arrhythmias occur when the normal electrical activation sequence in the heart is disrupted and their prevalence is expected to rise, as people live longer. In some instances, effective treatments exist. For example, a pacemaker can be surgically placed or a catheter can be brought into the cardiac chambers and used to burn diseased regions of the heart or pacing leads can be implanted in the heart to bypass the diseased conduction system and replace it by artificial electrical activation. However, clinicians cannot always tell where to ablate with a catheter or who will benefit from artificial electrical activation. EWI could help determine in advance which patients can benefit from these treatments or identify with more precision which regions of the heart should be ablated. It could also be used to adapt treatment parameters as the patient's condition evolves.

"Since ultrasound is so safe, portable, and low cost," added Dr. Konofagou, "we can imagine a future where most physicians can carry a portable ultrasound scanner the size of an iPhone and easily get a map of the activation of the heart during a routine visit." Her team has already begun to image patients with arrhythmias and compare their measurements with the gold standard of catheterization and noncontact electrode measurements. If this study is conclusive, they will then move to a larger clinical study.

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Columbia University's Fu Foundation School of Engineering and Applied Science



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86 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (71.048736572266): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (42.915344238281): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (35.04753112793): 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 (77.009201049805): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (66.995620727539): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (46.014785766602): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (82.015991210938): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (46.014785766602): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (120.87821960449): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
106 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
107 (84.877014160156): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (69.141387939453): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
110 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
111 (115.15617370605): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (712.87155151367): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (633.00132751465): 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 (361.91940307617): 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 (117.06352233887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
116 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
117 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
118 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
119 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
120 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
121 (53.882598876953): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
122 (38.14697265625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
123 (308.03680419922): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 23146.867752075): 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 (884.05609130859): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735423 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735423 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 9087.085723877): ( 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 (131.84547424316): ( 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 (118.97087097168): 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 (48.160552978516): 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 (82.015991210938): 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 (41.007995605469): 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 (458.95576477051): 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 (54.836273193359): 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 (51.975250244141): 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 (56.982040405273): 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 (519.0372467041): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (393.86749267578): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (61.988830566406): SELECT name FROM jos_deeppockets WHERE id=214
139 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=214
140 (597.95379638672): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (557.18421936035): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
143 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
144 (!!!!! 9529.1137695312): TRUNCATE TABLE jos_trademed_module
145 (114.91775512695): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (61.03515625): 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=294735423 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (968.93310546875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
150 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
151 (!!!!! 1163.9595031738): 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 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
153 (50.783157348633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
154 (40.054321289062): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735423 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735423 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (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=214 or channel_id is null)
156 (33.140182495117): 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 (68.187713623047): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (77.962875366211): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
159 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735423 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735423 AND published='1' LIMIT 1
160 (40.054321289062): select jos_twitters.link from jos_twitters where cat=10
161 (36.001205444336): select jos_facebook.link from jos_facebook where cat=10
162 (44.107437133789): select jos_google_plus.link from jos_google_plus where cat=10
163 (45.061111450195): select jos_linkedin.link from jos_linkedin where cat=10
164 (286.10229492188): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
165 (!!!!! 1137.9718780518): insert into jos_banners_delta values (14202,'2025-08-12 18:33:45','216.73.216.186','view'),(14203,'2025-08-12 18:33:45','216.73.216.186','view')