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Wearable Ultrasound Patch Continuously Monitors Cerebral Blood Flow

By MedImaging International staff writers
Posted on 24 May 2024
Image: This soft and stretchy ultrasound patch can be worn on the temple to provide continuous monitoring of blood flow in the brain (Photo courtesy of David Baillot/UC San Diego Jacobs School of Engineering)
Image: This soft and stretchy ultrasound patch can be worn on the temple to provide continuous monitoring of blood flow in the brain (Photo courtesy of David Baillot/UC San Diego Jacobs School of Engineering)

The standard clinical method for monitoring cerebral blood flow, transcranial Doppler ultrasound, depends on a skilled technician holding an ultrasound probe against the patient’s head. This method, however, has limitations. It is operator-dependent, which means the accuracy of the readings can vary with the operator's skill. Moreover, it is not suitable for continuous monitoring, as cerebral blood flow is usually checked only at specific times during the day, which may not capture fluctuations occurring at other times. Now, a wearable ultrasound patch overcomes these hurdles by offering a hands-free, consistent, and comfortable solution for monitoring cerebral blood flow that patients can wear continuously throughout their hospital stay.

Developed by engineers at the University of California San Diego (La Jolla, CA, USA), this wearable ultrasound patch allows for the continuous, non-invasive monitoring of cerebral blood flow. The patch, which is soft, stretchy, and worn on the temple, provides three-dimensional blood flow data, a first for wearable technology. This innovation is particularly beneficial for patients undergoing or recovering from brain surgery, representing a significant advancement over traditional transcranial Doppler ultrasound. The patch is about the size of a postage stamp and is made from a silicone elastomer containing several layers of stretchy electronics. It includes an array of small piezoelectric transducers that emit and receive ultrasound waves to measure blood flow.

Another essential feature of the patch is a copper mesh layer made of spring-shaped wires that enhance signal quality by reducing interference from the body and external environment. Additional layers include stretchable electrodes that support the patch’s functionality. For operation, the patch connects via cables to a power source and a computer. The system utilizes ultrafast ultrasound imaging to perform 3D monitoring. Unlike conventional ultrasound, which captures around 30 images per second, ultrafast imaging captures thousands, crucial for collecting detailed data from the piezoelectric transducers, which could otherwise be diminished by the strong reflection from the skull. Data are then processed using specialized algorithms to reconstruct three-dimensional details such as the size, angle, and position of the major brain arteries.

Researchers tested the ultrasound patch on 36 healthy volunteers to assess its ability to measure blood flow velocities—peak systolic, mean flow, and end-diastolic velocities—in the brain’s major arteries. The study participants undertook activities that affected blood flow, such as hand-gripping, breath-holding, and reading. The measurements of the ultrasound patch were almost similar to those obtained using a conventional ultrasound probe. The researchers will now collaborate with clinicians at UC San Diego School of Medicine to test the ultrasound patch on patients suffering from neurological conditions that affect cerebral blood flow.

“The continuous monitoring capability of the patch addresses a critical gap in current clinical practices,” said study co-first author Sai Zhou.

“The cerebral vasculature is a complex structure with multiple branching vessels. You need a device capable of capturing this three-dimensional information to get the whole picture and obtain more accurate measurements,” added Xinyi Yang, another co-first author of this study.

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86 (29.087066650391): SELECT show_live FROM jos_com_show_setting LIMIT 1
87 (!!!!! 3262.996673584): SELECT show_live FROM jos_com_show_setting LIMIT 1
88 (98.228454589844): SELECT show_live FROM jos_com_show_setting LIMIT 1
89 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
90 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
91 (409.12628173828): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
92 (47.922134399414): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
93 (!!!!! 1187.0861053467): 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`
94 (103.95050048828): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (49.114227294922): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (56.028366088867): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (28.848648071289): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (44.107437133789): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
106 (46.014785766602): SELECT show_live FROM jos_com_show_setting LIMIT 1
107 (38.862228393555): SELECT show_live FROM jos_com_show_setting LIMIT 1
108 (!!!!! 11620.998382568): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
109 (150.91896057129): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
110 (560.99891662598): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (544.07119750977): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (929.83245849609): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
113 (76.055526733398): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
114 (463.00888061523): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
115 (!!!!! 2563.9533996582): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
116 (887.87078857422): 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
117 (606.06002807617): 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
118 (!!!!! 1596.9276428223): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
119 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
120 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
121 (45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
122 (82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
123 (41.961669921875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
124 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
125 (40.054321289062): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
126 (303.03001403809): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
127 (!!!!! 50214.052200317): 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
128 (547.17063903809): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801288 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801288 AND type='deeppockets_item' AND published='1' LIMIT 1
129 (!!!!! 17076.015472412): ( 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
130 (!!!!! 4857.063293457): ( 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
131 (396.9669342041): 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
132 (54.121017456055): 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
133 (257.01522827148): 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
134 (58.174133300781): 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
135 (309.94415283203): 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
136 (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
137 (190.97328186035): 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
138 (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
139 (304.9373626709): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
140 (!!!!! 4884.0045928955): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
141 (442.0280456543): SELECT name FROM jos_deeppockets WHERE id=214
142 (56.982040405273): SELECT name FROM jos_deeppockets WHERE id=214
143 (694.03648376465): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
144 (723.12355041504): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
145 (111.10305786133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
146 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
147 (!!!!! 9227.0374298096): TRUNCATE TABLE jos_trademed_module
148 (!!!!! 1534.9388122559): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
149 (564.8136138916): 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=294801288 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
150 (!!!!! 1194.953918457): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
151 (96.08268737793): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
152 (!!!!! 2392.053604126): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
153 (498.05641174316): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
154 (!!!!! 1904.9644470215): 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
155 (!!!!! 2372.9801177979): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
156 (100.85105895996): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
157 (440.12069702148): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801288 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801288 AND type='deeppockets_item' AND published='1' LIMIT 1
158 (!!!!! 2346.9924926758): 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)
159 (65.088272094727): 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)
160 (351.90582275391): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
161 (671.8635559082): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
162 (65.088272094727): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801288 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801288 AND published='1' LIMIT 1
163 (329.01763916016): select jos_twitters.link from jos_twitters where cat=10
164 (150.91896057129): select jos_facebook.link from jos_facebook where cat=10
165 (195.02639770508): select jos_google_plus.link from jos_google_plus where cat=10
166 (42.200088500977): select jos_linkedin.link from jos_linkedin where cat=10
167 (!!!!! 1054.048538208): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
168 (!!!!! 1260.9958648682): insert into jos_banners_delta values (14202,'2025-08-01 22:23:40','216.73.216.210','view'),(14203,'2025-08-01 22:23:40','216.73.216.210','view')