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Photoacoustic Endoscopy Could Improve Crohn's Treatment

By MedImaging International staff writers
Posted on 07 May 2019
Image: Researchers are working to miniaturize the endoscope so that it could be used in the working channel of a colonoscope; this would allow a surgeon to view photoacoustic images prior to performing treatment (Photo courtesy of Guan Xu, University of Michigan).
Image: Researchers are working to miniaturize the endoscope so that it could be used in the working channel of a colonoscope; this would allow a surgeon to view photoacoustic images prior to performing treatment (Photo courtesy of Guan Xu, University of Michigan).
A new study highlights a prototype photoacoustic (PA) imaging endoscope that could be used to characterize inflammation and fibrosis in Crohn’s disease (CD).

Developed at the University of Michigan (U-M; Ann Arbor, USA) and Heilongjiang University (Harbin, China), the capsule-shaped acoustic resolution PA endoscope, which is just 7X19 millimeters is size, is designed to perform mulitwavelength side-view scanning of the intestinal strictures characteristic of CD. The endoscopic probe delivers near infrared light (NIR) at 1310 nanometers, the wavelength absorbed by collagen protein, which is characteristic of fibrosis. The light absorption causes collagen to expand slightly, leading to a mechanical vibration that can be captured using ultrasound imaging.

The performance of the probe was tested in phantom experiments and an in-vivo rabbit trinitrobenzene sulfonic acid (TNBS) model with acute (inflammatory only) or chronic (mixed fibrotic and inflammatory) colitis. Motion artifacts (such as intestinal peristalsis and respiratory motion) were compensated for to improve image qualities. The probe successfully identified significant PA measurement differences between normal, acute, and chronic intestinal strictures, which were also confirmed by histopathology. The study was published in the May 2019 issue of Biomedical Optics Express.

“Currently, there is no imaging modality that can be used in the intestine to distinguish inflammation from fibrosis. The difficulty in accurately assessing the presence and development of fibrosis in the strictures adds a great deal of complexity to Crohn's disease management decisions,” said senior author Guan Xu, PhD, of U-M. “This new imaging technology could help more accurately plan therapy for each CD patient. This would allow more targeted treatment and help minimize any adverse effects that might result from treatment.”

PA imaging is based on non-ionizing laser pulses fired into biological tissues; some of the laser energy delivered is converted into heat, leading to transient thermoelastic expansion and subsequent wideband ultrasonic emission, which can be detected by ultrasonic transducers and analyzed to produce images. The magnitude of the PA signal is proportional to the local energy deposition, which can be confirmed by optical absorption contrast on the images of the targeted areas.

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97 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (47.922134399414): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
105 (51.975250244141): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
106 (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 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (47.206878662109): 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (114.20249938965): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
109 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
110 (74.863433837891): 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (487.08915710449): 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (538.11073303223): 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 (319.9577331543): 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 (74.863433837891): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
115 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
116 (62.942504882812): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
117 (39.815902709961): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
118 (108.00361633301): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
119 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
120 (244.8558807373): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
121 (!!!!! 18690.10925293): 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
122 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
123 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
124 (433.92181396484): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777890 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777890 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 443773.03123474): ( 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 (138.0443572998): ( 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 (458.0020904541): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
128 (97.036361694336): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800513 LIMIT 1
129 (333.07075500488): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
130 (72.956085205078): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800359 LIMIT 1
131 (278.94973754883): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
132 (61.988830566406): SELECT dp.id, dp.name, dp.title, dp.video, dp.video_source, dp.created FROM jos_deeppockets AS dp WHERE dp.id = 294800361 LIMIT 1
133 (466.10832214355): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
134 (441.07437133789): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
135 (231.02760314941): SELECT name FROM jos_deeppockets WHERE id=215
136 (46.014785766602): SELECT name FROM jos_deeppockets WHERE id=215
137 (528.09715270996): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
138 (395.05958557129): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
139 (79.870223999023): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
140 (48.87580871582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
141 (!!!!! 10141.849517822): TRUNCATE TABLE jos_trademed_module
142 (144.00482177734): 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
143 (91.075897216797): 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=294777890 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
144 (!!!!! 1034.9750518799): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
145 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
146 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
147 (72.002410888672): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
148 (!!!!! 1729.9652099609): 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
149 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
150 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
151 (49.114227294922): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294777890 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294777890 AND type='deeppockets_item' AND published='1' LIMIT 1
152 (30.994415283203): 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)
153 (26.941299438477): 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)
154 (48.87580871582): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
155 (90.122222900391): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
156 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294777890 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294777890 AND published='1' LIMIT 1
157 (154.97207641602): select jos_twitters.link from jos_twitters where cat=10
158 (36.001205444336): select jos_facebook.link from jos_facebook where cat=10
159 (34.093856811523): select jos_google_plus.link from jos_google_plus where cat=10
160 (39.100646972656): select jos_linkedin.link from jos_linkedin where cat=10
161 (429.15344238281): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14615,14202,14203)
162 (!!!!! 1313.9247894287): insert into jos_banners_delta values (14615,'2025-06-19 19:20:58','216.73.216.120','view'),(14202,'2025-06-19 19:20:58','216.73.216.120','view'),(14203,'2025-06-19 19:20:58','216.73.216.120','view')