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Functional Ultrasound Imaging Records Brain Activity through Transparent Skull Implant

By MedImaging International staff writers
Posted on 30 May 2024

Functional brain imaging, which captures brain activity data by measuring changes in blood flow or electrical impulses, provides crucial insights into brain function for both healthy individuals and those with neurological disorders. More...

However, existing techniques like functional magnetic resonance imaging (fMRI) and intracranial electroencephalography (EEG) have limitations, including low resolution, lack of portability, and the requirement for invasive surgery. Functional ultrasound imaging (fUSI) is now emerging as a sensitive and precise alternative that could address these issues.

In the first study of its kind led by the Keck School of Medicine of USC (Los Angeles, CA, USA) and the California Institute of Technology (Caltech, Pasadena, CA, USA), researchers have designed and implanted a transparent window into the skull of a patient. This was followed by the use of fUSI to gather high-resolution brain imaging data through this window. Preliminary results indicate that this non-invasive method could revolutionize patient monitoring, clinical research, and our understanding of brain function.

Building on earlier work where the team developed specialized ultrasound sequences for measuring brain function and optimizing brain-computer interfaces, they tested various transparent skull implants on rats. A thin window made of polymethyl methacrylate (PMMA), similar to plexiglass, provided the best imaging clarity. Subsequently, a custom implant was created to explore the potential of fUSI in a research participant recovering from a traumatic brain injury (TBI).

Prior to the reconstructive surgery, the researchers fine-tuned fUSI parameters using a phantom (a device used to test medical imaging equipment) and animal models. They then monitored the patient’s brain activity through fUSI during tasks performed both pre-surgery and post-implantation of the clear window. fUSI not only offered sharper resolution than fMRI but, unlike intracranial EEG, it avoids the need for internal brain electrodes. It also costs less than these methods and could provide clinical benefits over opaque skull implants.

The novel technique also holds promise for broader studies on TBI and other neurological conditions, as well as the ability to observe the healthy brain's management of cognitive, sensory, motor, and autonomic functions. Although fUSI and the clear implant remain experimental pending clinical trials, the research team is actively working to refine their fUSI techniques to enhance imaging resolution further. They plan future studies involving more participants to better establish the connection between specific brain functions and fUSI data.

“This is the first time anyone had applied functional ultrasound imaging through a skull replacement in an awake, behaving human performing a task,” said Charles Liu, MD, PhD, a professor of clinical neurological surgery, urology and surgery at the Keck School of Medicine and director of the USC Neurorestoration Center. “The ability to extract this type of information noninvasively through a window is pretty significant, particularly since many of the patients who require skull repair have or will develop neurological disabilities. In addition, ‘windows’ can be surgically implanted in patients with intact skulls if functional information can help with diagnosis and treatment.”

Related Links:
Keck School of Medicine of USC
Caltech


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88 (51.975250244141): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
89 (38.14697265625): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
90 (44.822692871094): 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 (60.081481933594): SELECT show_live FROM jos_com_show_setting LIMIT 1
92 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (31.948089599609): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (34.093856811523): SELECT show_live FROM jos_com_show_setting LIMIT 1
105 (101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
106 (59.843063354492): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
107 (66.041946411133): 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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (65.088272094727): 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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
109 (118.01719665527): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
110 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
111 (66.995620727539): 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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (702.1427154541): 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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
113 (739.09759521484): 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 (482.79762268066): 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 (155.21049499512): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
116 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
117 (70.095062255859): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
118 (54.121017456055): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
119 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
120 (49.114227294922): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
121 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
122 (50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
123 (398.87428283691): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
124 (!!!!! 29479.026794434): 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 (639.91546630859): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801353 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801353 AND type='deeppockets_item' AND published='1' LIMIT 1
126 (!!!!! 10394.096374512): ( 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 (101.08947753906): ( 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 (46.014785766602): 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 (55.074691772461): 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 (65.088272094727): 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 (36.954879760742): 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 (393.15223693848): 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 (41.961669921875): 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 (37.908554077148): 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 (36.001205444336): 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 (680.92346191406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (454.18739318848): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
138 (50.783157348633): SELECT name FROM jos_deeppockets WHERE id=214
139 (36.001205444336): SELECT name FROM jos_deeppockets WHERE id=214
140 (746.9654083252): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (614.88151550293): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))214((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
142 (97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
143 (66.041946411133): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
144 (!!!!! 30435.085296631): TRUNCATE TABLE jos_trademed_module
145 (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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (77.009201049805): 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=294801353 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
147 (!!!!! 1075.0293731689): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (84.877014160156): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
149 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
150 (68.902969360352): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
151 (!!!!! 1568.078994751): 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 (83.92333984375): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
153 (60.081481933594): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
154 (42.200088500977): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294801353 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294801353 AND type='deeppockets_item' AND published='1' LIMIT 1
155 (40.054321289062): 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 (36.001205444336): 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 (46.014785766602): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
158 (87.976455688477): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
159 (59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294801353 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294801353 AND published='1' LIMIT 1
160 (41.961669921875): select jos_twitters.link from jos_twitters where cat=10
161 (37.193298339844): select jos_facebook.link from jos_facebook where cat=10
162 (36.001205444336): select jos_google_plus.link from jos_google_plus where cat=10
163 (36.954879760742): select jos_linkedin.link from jos_linkedin where cat=10
164 (329.97131347656): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
165 (!!!!! 2334.1178894043): insert into jos_banners_delta values (14202,'2025-08-02 15:08:19','216.73.216.210','view'),(14203,'2025-08-02 15:08:19','216.73.216.210','view')