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Optical Coherence Tomography Used to Image Pain Management in Labor and Diabetic Retinopathy and Glaucoma

By MedImaging International staff writers
Posted on 19 Jun 2014
Researchers are using established imaging technology called optical coherence tomography (OCT) and integrating it with other devices for cutting-edge imaging of women in labor and individuals with diabetic retinopathy and glaucoma.

The research was presented at CLEO 2014, the Conference on Lasers and Electro-Optics, which was held June 8–13, 2014, in San Jose (CA, USA). OCT uses scattered “echoes” or reflections of light waves to create high-resolution images of biologic tissues, similar to ultrasound imaging but with one order of magnitude improvement in the resolution. Ophthalmologists have long been using OCT to study the retina. More recently, OCT has been applied to a range of other clinical specialties, including cardiology, where it is used to examine the formation of plaques in coronary arteries in situ, and oncology for early cancer detection and staging in the gastrointestinal and urogenital tract.

Bioengineer Dr. Yu Chen, from the University of Maryland (College Park, USA), and his colleagues have developed a way to integrate an OCT device with an 18-gauge epidural needle. Epidural administration, Dr. Chen noted, is traditionally performed blindly, using anatomic landmarks. However, the investigators newly miniaturized handheld device lets anesthesiologists see tissue from the perspective of the tip of the epidural needle, which could help doctors to deliver spinal anesthetic to patients with less pain and fewer complications.

“Due to lack of visual feedback, failure rates are often high, leading to multiple needle insertions,” Dr. Chen said. Side effects of these failures can include trauma to blood vessels and punctures in the dura, the outermost membrane surrounding the brain and spinal cord. “An OCT forward-imaging probe can provide anesthesiologists with real-time visualization of the microarchitecture of tissues and important landmarks, and thus could significantly improve the accuracy and the safety of the needle-based procedure,” Dr. Chen said.

The researchers have been successful in testing needle-guidance research on pig swine samples and hope to conduct a preclinical study of the device by 2015.

In another study presented at the conference June 12, investigators from the University of California, Davis (UC Davis; USA), led by biomedical engineer Dr. Vivek Srinivasan, have shown how OCT can simultaneously measure blood flow and blood oxygenation in vessels, without the need for contrast agents.

OCT, similar to ultrasound, can provide structural information, but it can also be used to determine flow rates and for angiography, visualizing the interior of blood vessels, according to Shau Poh Chong, a postdoctoral researcher in the Srinivasan lab. “Conventional pulse oximetry measures oxygen saturation using transmitted light,” Dr. Chong stated. “Performing these measurements quantitatively with reflected light has traditionally been difficult due to the unknown distance traveled by the light through scattering tissue.”

OCT directly determines the distance that light travels. Until now, however, it was challenging to use OCT to gauge oxygen saturation in blood, due to additional modeling errors introduced by light scattering. At visible wavelengths, scattering is much lower relative to blood absorption than at infrared wavelengths, where OCT is typically performed. The OCT system developed in the Srinivasan lab uses broadband visible light to measure the amounts of both oxygenated and deoxygenated hemoglobin, the oxygen-carrying protein of blood, thus revealing oxygen saturation levels. In addition, the team developed new methods to further reduce modeling errors caused by light scattering.

“The broad set of measurements provided by the system, including angiography, oximetry, and red blood cell flow rates enables the direct assessment of tissue oxygen metabolism, which is essential for understanding the evolution of oxygen supply and demand in numerous disease models,” Dr. Chong concluded. “In the future, these techniques could be applied to study metabolic changes in diseases that affect the human retina, such as diabetic retinopathy and glaucoma.”

Related Links:

University of Maryland
University of California, Davis


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89 (61.988830566406): 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 (73.909759521484): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (33.855438232422): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (33.140182495117): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
105 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
106 (59.127807617188): 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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (79.154968261719): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
109 (48.160552978516): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
110 (73.909759521484): 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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (698.08959960938): 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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (679.01611328125): 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 (408.88786315918): 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 (85.115432739258): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
115 (64.13459777832): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
116 (109.91096496582): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
117 (49.829483032227): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
118 (51.021575927734): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
119 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
120 (61.03515625): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
121 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
122 (391.00646972656): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 22994.995117188): 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 (813.00735473633): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294753102 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294753102 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 8793.830871582): ( 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 (81.062316894531): ( 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 (41.007995605469): 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 (30.040740966797): 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 (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
130 (38.862228393555): 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 (440.12069702148): 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 (57.93571472168): 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 (61.03515625): 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 (44.107437133789): 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 (498.05641174316): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (481.12869262695): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (61.03515625): SELECT name FROM jos_deeppockets WHERE id=215
138 (41.961669921875): SELECT name FROM jos_deeppockets WHERE id=215
139 (850.91590881348): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (713.10997009277): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (119.92454528809): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
142 (73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
143 (!!!!! 9893.8941955566): TRUNCATE TABLE jos_trademed_module
144 (107.0499420166): 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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (85.115432739258): 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=294753102 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (454.90264892578): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
149 (75.817108154297): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
150 (!!!!! 1348.9723205566): 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 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
152 (58.889389038086): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
153 (62.942504882812): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294753102 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294753102 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (52.928924560547): 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 (44.107437133789): 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 (60.081481933594): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (185.96649169922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
158 (107.0499420166): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294753102 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294753102 AND published='1' LIMIT 1
159 (67.949295043945): select jos_twitters.link from jos_twitters where cat=10
160 (45.061111450195): select jos_facebook.link from jos_facebook where cat=10
161 (36.001205444336): select jos_google_plus.link from jos_google_plus where cat=10
162 (29.087066650391): select jos_linkedin.link from jos_linkedin where cat=10
163 (410.07995605469): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (!!!!! 1035.9287261963): insert into jos_banners_delta values (14202,'2025-06-23 11:52:03','216.73.216.120','view'),(14203,'2025-06-23 11:52:03','216.73.216.120','view')