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Ventilation Percussion Improves Cardiac MRI Accuracy

By MedImaging International staff writers
Posted on 09 Jun 2016
Image: Three-dimensional steady-state free precession acquisition of cardiac structures acquired during 6.2 minutes of apnea with PV (Photo courtesy of CHUV).
Image: Three-dimensional steady-state free precession acquisition of cardiac structures acquired during 6.2 minutes of apnea with PV (Photo courtesy of CHUV).
A novel ventilation technique allows cardiac magnetic resonance (CMR) imaging to be performed in virtual lack of motion.

Developed at University Hospital Lausanne (CHUV; Switzerland), the percussive ventilation (VP) technique involves the patients wearing a mask over their mouth, which is connected to a ventilator that delivers small volumes of air (percussions). Instead of the 10-15 large breaths patients would take naturally per minute, air is provided in 300-500 small VP pulses per minute. The air volumes inhaled are so small the chest does not move, allowing acquisition of higher quality images in less time.

In a study designed to test the feasibility and tolerability of high frequency PV during CMR, the researchers recruited two patients, one healthy volunteer and one patient with a thymic lesion. The procedure was well tolerated, and there was no need to correct for respiratory motion. Lung volumes were "frozen" in full inspiration, allowing the researchers to see both coronary arteries and pulmonary vessels. The study was presented at EuroCMR, held during May 2016 in Florence, Italy.

“The possibilities with high frequency PV are huge. You could run all the CMR sequences in one batch, which would be much faster; data could be acquired constantly with fewer artifacts,” said lead author and study presenter Professor Juerg Schwitter, MD, director of the CHUV CMR Centre. “We might be able to use this technique for diagnosis of sicker patients, who find breath holding difficult and need the imaging to be done quickly.”

"This technique would help us to collect high resolution images where we want millimetric precision, for example to localize scar in the myocardium or to see the anatomy of coronary arteries or valves and malformations,” added Professor Schwitter. “We could even imagine that if the patient is not breathing for 20 minutes, or even longer, this technique could give a precise 3D representation of cardiac structures and help guide electrophysiology procedures such as ablation."

CMR is a medical imaging technology for the non-invasive assessment of the function and structure of the cardiovascular system that is based on the same basic principles as magnetic resonance imaging (MRI), with optimizations that use rapid imaging sequences. As a result, CMR images are currently acquired in steps. Patients breathe in and then hold their breath for each image, then recover before repeating the process for the next image. PV could offer the potential to acquire all images in one go, with no need to correct for respiratory motion.

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98 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (29.802322387695): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (!!!!! 2820.0149536133): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (96.08268737793): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 4223.8235473633): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
105 (82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
106 (79.870223999023): 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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (656.1279296875): 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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 3296.8521118164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
109 (88.930130004883): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
110 (112.05673217773): 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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1317.024230957): 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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (788.92707824707): 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 (586.98654174805): 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 (769.85359191895): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
115 (674.96299743652): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
116 (!!!!! 2157.9265594482): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
117 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
118 (385.04600524902): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
119 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
120 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
121 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
122 (!!!!! 4737.8540039062): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 68199.872970581): 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
124 (!!!!! 1005.1727294922): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294764534 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294764534 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 18216.848373413): ( 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 (55.074691772461): ( 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 (689.02969360352): 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
128 (55.074691772461): 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 (383.13865661621): 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
130 (173.80714416504): 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 (336.1701965332): 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
132 (133.03756713867): 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 (591.03965759277): 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
134 (36.954879760742): 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 (!!!!! 1199.0070343018): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (704.05006408691): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (52.928924560547): SELECT name FROM jos_deeppockets WHERE id=212
138 (31.948089599609): SELECT name FROM jos_deeppockets WHERE id=212
139 (541.92543029785): 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 '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (416.99409484863): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))212((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 4288.1965637207): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
142 (!!!!! 4901.1707305908): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
143 (!!!!! 5872.9648590088): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 5959.9876403809): 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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (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=294764534 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1135.1108551025): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (387.90702819824): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
149 (224.11346435547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
150 (!!!!! 10658.025741577): 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
151 (136.8522644043): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
152 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
153 (605.82160949707): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294764534 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294764534 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (73.19450378418): 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=212 or channel_id is null)
155 (41.007995605469): 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=212 or channel_id is null)
156 (466.10832214355): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1762.866973877): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
158 (98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294764534 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294764534 AND published='1' LIMIT 1
159 (82.015991210938): select jos_twitters.link from jos_twitters where cat=10
160 (43.869018554688): select jos_facebook.link from jos_facebook where cat=10
161 (35.04753112793): select jos_google_plus.link from jos_google_plus where cat=10
162 (30.040740966797): select jos_linkedin.link from jos_linkedin where cat=10