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Intravascular Photoacoustic Imaging Technology Designed for Diagnosing Heart Disease

By MedImaging International staff writers
Posted on 17 Nov 2014
Image:  A new type of medical imaging technology could diagnose cardiovascular disease by measuring ultrasound signals from molecules exposed to a fast-pulsing laser. The system, called intravascular photoacoustic imaging, takes precise three-dimensional images of plaques lining arteries and identifies deposits that are likely to rupture and cause heart attacks. This cross-sectional view of an artery shows lipids (green) deposited inside the arterial wall. Black and white indicate contrast showing the cross-sectional geometry (Photo courtesy of Purdue University).
Image: A new type of medical imaging technology could diagnose cardiovascular disease by measuring ultrasound signals from molecules exposed to a fast-pulsing laser. The system, called intravascular photoacoustic imaging, takes precise three-dimensional images of plaques lining arteries and identifies deposits that are likely to rupture and cause heart attacks. This cross-sectional view of an artery shows lipids (green) deposited inside the arterial wall. Black and white indicate contrast showing the cross-sectional geometry (Photo courtesy of Purdue University).
Researchers are close to bringing to market a new type of medical imaging technology that could detect cardiovascular disease by measuring ultrasound signals from molecules exposed to a fast-pulsing laser.

The system captures precise three-dimensional (3D) images of plaques lining arteries and identifies deposits that are prone to rupture and cause heart attacks, according to Ji-Xin Cheng, a professor in Purdue University’s (West Lafayette, IN, USA) Weldon School of biomedical engineering and department of chemistry.

The imaging technique reveals the presence of carbon-hydrogen bonds comprising lipid molecules in arterial plaques that cause heart disease. The research findings were published October 29, 2014, in the Nature journal Scientific Reports. “This allows us to see the exact nature of plaque formation in the walls of arteries so we can define whether plaque is going to rupture,” said Michael Sturek, coauthor of the study, and a professor and chair of the department of cellular and integrative physiology at Indiana University School of Medicine (Indianapolis, IN, USA). “Some plaques are more dangerous than others, but one needs to know the chemical makeup of the blood vessel wall to determine which ones are at risk of rupturing.”

Research in the area has been hampered by the inability to perform high-speed imaging in tissue. The researchers resolved this hurdle by developing a Raman laser using a laser that produces 2,000 pulses per second, each pulse capable of generating an image, representing a 100-fold increase in the imaging speed of the new technology, called intravascular photoacoustic imaging. “This innovation represents a big step toward advancing this technology to the clinical setting,” Dr. Cheng said.

The study was authored by researchers from Purdue, Indiana University School of Medicine, the University of California, Davis (USA), the University of California, Irvine (USA), and startup company Spectral Energy (Dayton, OH USA). The imaging technique is “label-free,” meaning it does not require samples to be marked with dyes, making it appealing for diagnostic applications.

The technology is being marketed by the company Vibronix, Inc. (West Lafayette, IN, USA). The laser, which pulses in the near-infrared range of the spectrum, causes tissue to heat and expand locally, generating pressure waves at the ultrasound frequency that can be captured with a device called a transducer.

The system is small enough to be integrated into an endoscope to place into blood vessels using a catheter, according to Dr. Cheng. The near-infrared laser causes enough heating to generate ultrasound but not enough to damage the tissues. The research was conducted with intact pig tissue and will expand to research with live animals and then clinical studies in humans.

Related Links:

Purdue University
Indiana University School of Medicine
University of California, Davis 


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87 (47.922134399414): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
88 (30.040740966797): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (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`
90 (!!!!! 1641.9887542725): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (58.174133300781): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (32.186508178711): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (128.03077697754): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (!!!!! 1765.0127410889): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (56.982040405273): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (547.88589477539): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (37.908554077148): 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 (197.17216491699): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 3028.1543731689): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
105 (835.89553833008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
106 (!!!!! 1416.9216156006): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (637.05444335938): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 5127.9067993164): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
109 (932.93190002441): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
110 (!!!!! 2130.9852600098): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (749.11117553711): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (681.87713623047): 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 (!!!!! 4642.0097351074): 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 (274.8966217041): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
115 (178.09867858887): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
116 (!!!!! 3487.1101379395): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
117 (118.97087097168): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
118 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
119 (214.81513977051): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
120 (835.18028259277): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
121 (109.91096496582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
122 (818.96781921387): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 50534.009933472): 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 (696.89750671387): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755743 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755743 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 18911.123275757): ( 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 (80.82389831543): ( 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 (797.03330993652): 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 (843.04809570312): 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 (!!!!! 2668.8575744629): 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 (272.03559875488): 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 (554.08477783203): 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 (51.021575927734): 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 (!!!!! 1031.8756103516): 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 (48.160552978516): 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 (!!!!! 7907.8674316406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (!!!!! 7689.9528503418): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (!!!!! 7901.1917114258): SELECT name FROM jos_deeppockets WHERE id=214
138 (!!!!! 8026.123046875): SELECT name FROM jos_deeppockets WHERE id=214
139 (!!!!! 9029.1500091553): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 6922.0066070557): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 8120.7752227783): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
142 (!!!!! 7654.9053192139): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
143 (!!!!! 15068.054199219): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 11310.10055542): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 4018.0683135986): 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=294755743 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 1105.0701141357): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (978.94668579102): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 5364.8948669434): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
149 (806.09321594238): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
150 (!!!!! 4770.9941864014): 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 (!!!!! 3839.9696350098): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
152 (!!!!! 7936.954498291): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
153 (!!!!! 5557.0602416992): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294755743 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294755743 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (!!!!! 5439.0430450439): 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)
155 (!!!!! 1376.1520385742): 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 (622.98774719238): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 1332.9982757568): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
158 (864.02893066406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294755743 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294755743 AND published='1' LIMIT 1
159 (792.02651977539): select jos_twitters.link from jos_twitters where cat=10
160 (50.067901611328): select jos_facebook.link from jos_facebook where cat=10
161 (388.86070251465): select jos_google_plus.link from jos_google_plus where cat=10
162 (45.061111450195): select jos_linkedin.link from jos_linkedin where cat=10