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Novel Method Combines Optical Measurements with Ultrasound for Monitoring ‘Engine’ of Pregnancy

By MedImaging International staff writers
Posted on 17 Aug 2022

The placenta, considered as the “engine” of pregnancy, is an organ that plays a crucial role in delivering nutrients and oxygen to the fetus. More...

Placental dysfunction can lead to complications such as fetal growth restriction, preeclampsia, and stillbirth. Now, researchers developing tools to assess human placental structure and function in real time, including optical devices, have come up with a novel method for imaging the placenta in pregnant patients. By combining optical measurements with ultrasound, the team has demonstrated how oxygen levels in the placenta can be monitored noninvasively, providing a new way to generate a better understanding of this complex, crucial organ.

For three years, researchers at the University of Pennsylvania (Philadelphia, PA, USA) and the Children’s Hospital of Philadelphia (CHOP, (Philadelphia, PA, USA) optimized the design of their instrument and tested it in preclinical settings. The process involved integrating optical fibers with ultrasound probes, exploring various ultrasound transducers, and improving the multimodal technology so that measurements were stable, accurate, and reproducible while collecting data at the bedside. The resulting instrumentation now enables researchers to study the anatomy of the placenta while also collecting detailed functional information about placenta blood flow and oxygenation, capabilities that existing commercially devices do not have, the researchers say.

Because the placenta is located far below the body’s surface, one of the key technical challenges addressed by the researchers was reducing background noise in the opto-electronic system. Light is scattered and absorbed when it travels through thick tissues, and the key for success was to reduce background interference so that the small amount of light that penetrates deep into the placenta and then returns is still large enough for a high-quality measurement.

In a pilot clinical study conducted by the researchers, 24 pregnant patients in their third trimester were given supplemental oxygen for a short time period, creating placental hyperoxia. Using the device, the team collected measurements of the placenta’s oxygenated and deoxygenated blood concentrations before and during hyperoxia; the results demonstrated that the device could be used to study placental function in real time. The research also provided new insights into the relationship between blood flow and maternal vascular malperfusion, which occurs when blood flow into the placenta is impeded.

While the device is still in development, the researchers are currently refining their instrument to make it more user-friendly and to allow it to collect data faster. The team is also currently working on larger studies, including recently data from patients during their second trimester, and they are also interested in studying different regions of the placenta. And because there are many unanswered clinical questions about the placenta, the biggest potential of this work for the researchers is in providing a way to start answering those questions.

“What was exciting is that, not only did we get an instrument to probe deeper than commercial devices, but we also obtained an early signal that hyperoxygenation experiments can differentiate a healthy placenta from a diseased placenta,” said Nadav Schwartz from the University of Pennsylvania. “Without being able to study the placenta directly, we are relying on very indirect science. This is a tool that helps us study the underlying physiology of pregnancy so we can more strategically study interventions that can help support good pregnancy outcomes.”

Related Links:
University of Pennsylvania
CHOP 


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88 (59.127807617188): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (82.015991210938): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (50.067901611328): 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`
91 (54.121017456055): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (30.994415283203): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (43.869018554688): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (56.028366088867): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (89.883804321289): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
106 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
107 (64.849853515625): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (51.021575927734): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (103.95050048828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
110 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
111 (64.849853515625): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (577.92663574219): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (678.06243896484): 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 (391.96014404297): 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
115 (138.99803161621): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
116 (67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
117 (95.844268798828): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
118 (47.206878662109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
119 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
120 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
121 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
122 (36.001205444336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
123 (308.03680419922): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 23368.120193481): 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
125 (607.96737670898): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294794276 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294794276 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 8135.0803375244): ( 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 (143.05114746094): ( 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
128 (51.975250244141): 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 (30.994415283203): 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
130 (60.081481933594): 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 (42.915344238281): 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
132 (370.97930908203): 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 (40.054321289062): 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
134 (32.901763916016): 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 (27.894973754883): 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
136 (490.90385437012): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (328.06396484375): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (41.007995605469): SELECT name FROM jos_deeppockets WHERE id=214
139 (30.040740966797): SELECT name FROM jos_deeppockets WHERE id=214
140 (689.98336791992): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (658.03527832031): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (94.890594482422): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
143 (56.028366088867): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
144 (!!!!! 8893.9666748047): TRUNCATE TABLE jos_trademed_module
145 (201.94053649902): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (80.82389831543): 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=294794276 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (411.03363037109): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
150 (44.107437133789): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
151 (!!!!! 1641.0350799561): 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
152 (!!!!! 1055.9558868408): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
153 (97.036361694336): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
154 (58.889389038086): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294794276 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294794276 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (!!!!! 1630.7830810547): 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 (51.975250244141): 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)
157 (62.942504882812): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (241.99485778809): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
159 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294794276 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294794276 AND published='1' LIMIT 1
160 (785.11238098145): select jos_twitters.link from jos_twitters where cat=10
161 (51.975250244141): select jos_facebook.link from jos_facebook where cat=10
162 (!!!!! 1465.0821685791): select jos_google_plus.link from jos_google_plus where cat=10
163 (61.988830566406): select jos_linkedin.link from jos_linkedin where cat=10