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Promising New Imaging Technology for Diagnosis of Cardiovascular Disease, Diabetes

By MedImaging International staff writers
Posted on 05 Jul 2011
Image: A "vibrational photoacoustic" image showing the plaque in an arterial wall (Photo courtesy of Purdue University Weldon School of Biomedical Engineering image/Han-Wei Wang and Ji-Xin Cheng).
Image: A "vibrational photoacoustic" image showing the plaque in an arterial wall (Photo courtesy of Purdue University Weldon School of Biomedical Engineering image/Han-Wei Wang and Ji-Xin Cheng).
Researchers have developed a new type of imaging technology to diagnose cardiovascular disease and other disorders by measuring ultrasound signals from molecules exposed to a fast-pulsing laser.

The new method could be used to take precise three-dimensional (3D) images of plaques lining arteries, according to Dr. Ji-Xin Cheng, an associate professor of biomedical engineering and chemistry at Purdue University (West Lafayette, IN, USA). Other imaging modalities that provide molecular data are unable to penetrate tissue deep enough to reveal the three-dimensional structure of the plaques, but being able to do so would make better diagnoses possible, he said. "You would have to cut a cross section of an artery to really see the three-dimensional structure of the plaque," Dr. Cheng said. "Obviously, that can't be used for living patients."

The imaging reveals the presence of carbon-hydrogen bonds comprising lipid molecules in arterial plaques that cause heart disease. The method also might be used to detect fat molecules in muscles to diagnose diabetes and for other lipid-related disorders, including neurologic disorders and brain trauma. The technique also reveals nitrogen-hydrogen bonds making up proteins, meaning the imaging tool also might be useful for diagnosing other diseases and to study collagen's role in scar formation. "Being able to key on specific chemical bonds is expected to open a completely new direction for the field," Dr. Cheng said

Findings are detailed in an article published June 17, 2011, in the journal Physical Review Letters. The findings represent the culmination of four years of research led by Dr. Cheng and doctoral student Han-Wei Wang.

The new technique uses nanosecond laser pulses in the near-infrared range of the spectrum. The laser generates molecular "overtone" vibrations, or wavelengths that are not absorbed by the blood. The pulsed laser causes tissue to heat and expand locally, generating pressure waves at the ultrasound frequency that can be picked up with a device called a transducer. "We are working to miniaturize the system so that we can build an endoscope to put into blood vessels using a catheter," Dr. Cheng said. "This would enable us to see the exact nature of plaque formation in the walls of arteries to better quantify and diagnose cardiovascular disease."

Dr. Lihong Wang, a professor of biomedical engineering at Washington University in St. Louis (MO, USA), is a pioneer of using the photoacoustic imaging of blood vessels based on the absorption of light by the electrons in hemoglobin.

The Purdue researchers are the first to show that a strong photoacoustic signal can arise from the absorption of light by the chemical bonds in molecules. The near-infrared laser causes enough heating to generate ultrasound but not enough to damage tissue. "You can measure the time delay between the laser and the ultrasound waves, and this gives you a precise distance, which enables you to image layers of the tissues for three-dimensional pictures," Dr. Cheng said. "You do one scan and get all the cross sections. Our initial target is cardiovascular disease, but there are other potential applications, including diabetes and neurological conditions."

The approach represents a major improvement over another imaging technique, called coherent anti-Stokes Raman scattering (CARS), which has been used by the Purdue-based lab to study 3D plaque formation in arteries.

The study's findings are based on research with pig tissues in laboratory samples and also with live fruit flies. "You can see fat inside fly larvae, representing the potential to study how obesity affects physiology in humans," Dr. Cheng noted.

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89 (!!!!! 2651.9298553467): 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 (94.890594482422): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (39.815902709961): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (!!!!! 2153.1581878662): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (56.028366088867): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (72.002410888672): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (54.836273193359): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (51.975250244141): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (42.200088500977): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (!!!!! 2516.9849395752): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
105 (198.8410949707): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
106 (282.04917907715): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (!!!!! 3193.1400299072): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (!!!!! 3089.9047851562): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
109 (203.13262939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
110 (!!!!! 4108.190536499): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (!!!!! 1017.8089141846): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (!!!!! 1168.966293335): 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 (!!!!! 1125.0972747803): 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 (476.12190246582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
115 (218.15299987793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
116 (!!!!! 2927.0648956299): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
117 (155.92575073242): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
118 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
119 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
120 (696.18225097656): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
121 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
122 (452.04162597656): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 48348.903656006): 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 (!!!!! 1084.0892791748): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735887 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735887 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 21795.988082886): ( 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 (89.883804321289): ( 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 (751.01852416992): 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 (!!!!! 1086.950302124): 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 (!!!!! 1312.9711151123): 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 (72.002410888672): 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 (!!!!! 2807.8556060791): 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 (66.995620727539): 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 (37.193298339844): 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 (33.140182495117): 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 (!!!!! 1693.9640045166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (623.94142150879): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (800.13275146484): SELECT name FROM jos_deeppockets WHERE id=215
138 (170.94612121582): SELECT name FROM jos_deeppockets WHERE id=215
139 (!!!!! 3766.0598754883): 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 '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (!!!!! 7905.9600830078): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (!!!!! 7657.0510864258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
142 (!!!!! 7967.9489135742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
143 (!!!!! 10058.879852295): TRUNCATE TABLE jos_trademed_module
144 (!!!!! 5451.2023925781): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (!!!!! 8017.0631408691): 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=294735887 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (!!!!! 4090.0707244873): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (!!!!! 7470.1309204102): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (!!!!! 7982.9692840576): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
149 (!!!!! 7615.0894165039): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
150 (!!!!! 7347.1069335938): 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 (!!!!! 7712.8410339355): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
152 (!!!!! 8515.8348083496): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
153 (!!!!! 7736.9213104248): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294735887 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294735887 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (!!!!! 5120.9926605225): 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=215 or channel_id is null)
155 (!!!!! 6941.7953491211): 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=215 or channel_id is null)
156 (!!!!! 11620.998382568): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (!!!!! 6392.9557800293): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
158 (!!!!! 6754.8751831055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294735887 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294735887 AND published='1' LIMIT 1
159 (50.067901611328): select jos_twitters.link from jos_twitters where cat=10
160 (30.040740966797): select jos_facebook.link from jos_facebook where cat=10
161 (28.848648071289): select jos_google_plus.link from jos_google_plus where cat=10
162 (!!!!! 1569.0326690674): select jos_linkedin.link from jos_linkedin where cat=10