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By MedImaging International staff writers Posted on 09 Jan 2019
Image: Professor Robert McLaughlin (R) with the smart needle (Photo courtesy University of Adelaide).
A novel biopsy needle that contains a miniaturized optical coherence tomography (OCT) probe can help surgeons identify and avoid blood vessels during brain surgery.
Developed by researchers at the University of Adelaide (UA; Australia), Sir Charles Gairdner Hospital (Nedlands, Australia), and other institutions, the miniaturized fiber-optic OCT probe is integrated into a standard commercial neurosurgical stereotactic biopsy needle. Brain tissue is illuminated using near-infrared (NIR) light, and the backscattered optical signal from different depths is extracted using low-coherence interferometry and reconstructed into a structural image of the tissue, typically at a spatial resolution of 5-20 μm.
The researchers then tested the probe intraoperatively in eleven patients undergoing craniotomy, using it to detect blood vessels at risk of causing intracranial hemorrhage. The probe successfully detected surface blood vessels with a sensitivity of 91.2% and a specificity of 97.7%, and was also able to detect deep cerebral blood vessels. And as OCT is label free, the researchers did not need a contrast agent, relying on endogenous optical scatterers in the tissue. The study was published on December 19, 2018, in Science Advances.
“The fiber-optic camera, the size of a human hair, shines infrared light onto the brain tissue. And the computer system behind the needle identifies the blood vessel and alerts the surgeon,” said senior author Professor Robert McLaughlin, PhD, chair of Biophotonics at the University of Adelaide. “The imaging needle lets surgeons ‘see’ at-risk blood vessels as they insert the needle, allowing them to avoid causing bleeds. This is the first reported use of such a probe in the human brain during live surgery, and is the first step in the long process required to bring new tools like this into clinical practice.”
OCT is based on low-coherence interferometry, typically using NIR light, a relatively long wavelength that allows it to penetrate into the scattering medium. Depending on the properties of the light source, OCT can achieve sub-micrometer resolution. Despite being an echo imaging method (like ultrasound), it is limited to imaging 1-2 mm below the surface in biological tissue, as at greater depths the proportion of light that escapes without scattering is too small to be detected.
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(40.054321289062): SELECT show_live FROM jos_com_show_setting LIMIT 187
(41.007995605469): SELECT show_live FROM jos_com_show_setting LIMIT 188
(37.908554077148): SELECT show_live FROM jos_com_show_setting LIMIT 189
(41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 190
(41.961669921875): SELECT show_live FROM jos_com_show_setting LIMIT 191
(99.897384643555): SELECT fid FROM jos_deeppockets
WHERE cat=10
AND id=294776428
AND (type='deeppockets_item' OR type='deeppockets_item_link')
AND published='1'
LIMIT 192
(51.975250244141): SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294776428 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 193
(56.028366088867): 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
(65.088272094727): SELECT show_live FROM jos_com_show_setting LIMIT 195
(38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 196
(36.001205444336): SELECT show_live FROM jos_com_show_setting LIMIT 197
(43.153762817383): SELECT show_live FROM jos_com_show_setting LIMIT 198
(32.901763916016): SELECT show_live FROM jos_com_show_setting LIMIT 199
(39.100646972656): SELECT show_live FROM jos_com_show_setting LIMIT 1100
(51.021575927734): SELECT show_live FROM jos_com_show_setting LIMIT 1101
(36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1102
(63.896179199219): SELECT show_live FROM jos_com_show_setting LIMIT 1103
(73.909759521484): SELECT show_live FROM jos_com_show_setting LIMIT 1104
(75.817108154297): SELECT show_live FROM jos_com_show_setting LIMIT 1105
(42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1106
(42.915344238281): SELECT show_live FROM jos_com_show_setting LIMIT 1107
(36.954879760742): SELECT show_live FROM jos_com_show_setting LIMIT 1108
(97.990036010742): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1109
(105.14259338379): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1110
(88.930130004883): 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1111
(76.055526733398): 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1112
(101.08947753906): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1113
(66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1114
(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 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1115
(664.94941711426): 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1116
(650.88272094727): 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 1117
(342.84591674805): 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 1118
(73.909759521484): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1119
(55.074691772461): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1120
(132.79914855957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1121
(45.061111450195): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1122
(81.062316894531): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1123
(59.127807617188): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1124
(320.9114074707): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`125
(!!!!! 22371.053695679): 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
7126
(102.04315185547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1127
(69.141387939453): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1128
(503.0632019043): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294776428 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294776428 AND type='deeppockets_item' AND published='1' LIMIT 1129
(!!!!! 481269.83642578): (
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
3130
(70.095062255859): (
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
3131
(61.03515625): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800513
LIMIT 1132
(40.054321289062): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800513
LIMIT 1133
(49.114227294922): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800359
LIMIT 1134
(43.153762817383): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800359
LIMIT 1135
(36.954879760742): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800361
LIMIT 1136
(29.087066650391): SELECT
dp.id,
dp.name,
dp.title,
dp.video,
dp.video_source,
dp.created
FROM
jos_deeppockets AS dp
WHERE
dp.id = 294800361
LIMIT 1137
(583.17184448242): SELECT *
FROM jos_deeppockets
WHERE 1=1
AND id=294776428
AND (type='deeppockets_item' OR type='deeppockets_item_link')
AND published='1'
LIMIT 1138
(581.02607727051): SELECT *
FROM jos_deeppockets_archive
WHERE 1=1
AND id=294776428
AND (type='deeppockets_item' OR type='deeppockets_item_link')
AND published='1'
LIMIT 1139
(306.84471130371): SELECT name FROM jos_deeppockets WHERE id=215140
(43.869018554688): SELECT name FROM jos_deeppockets WHERE id=215141
(555.99212646484): 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((;)|($))' AND catid IN (0,110)
ORDER BY publish_up ASC LIMIT 3142
(502.8247833252): SELECT *,
DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up,
DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down
FROM jos_events
WHERE state=1
AND publish_up > NOW()
and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110)
ORDER BY publish_up ASC LIMIT 3143
(82.969665527344): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1144
(52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1145
(!!!!! 10653.018951416): TRUNCATE TABLE jos_trademed_module146
(131.13021850586): 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1147
(72.956085205078): 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=294776428
AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link')
AND dp.published='1' LIMIT 1148
(956.05850219727): SELECT *
FROM jos_deeppockets
WHERE 1=1
AND id=294776428
AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1149
(122.0703125): SELECT *
FROM jos_deeppockets
WHERE 1=1
AND id=294776428
AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1150
(98.943710327148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1151
(82.015991210938): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1152
(!!!!! 1142.0249938965): 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 6153
(79.870223999023): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1154
(50.067901611328): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1155
(46.014785766602): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294776428 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294776428 AND type='deeppockets_item' AND published='1' LIMIT 1156
(555.03845214844): 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)157
(56.028366088867): 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)158
(45.061111450195): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1159
(67.949295043945): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1160
(46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294776428 AND published='1'
union
SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294776428 AND published='1'
LIMIT 1161
(38.14697265625): select jos_twitters.link from jos_twitters where cat=10162
(30.994415283203): select jos_facebook.link from jos_facebook where cat=10163
(38.862228393555): select jos_google_plus.link from jos_google_plus where cat=10164
(30.994415283203): select jos_linkedin.link from jos_linkedin where cat=10165
(294.92378234863): update jos_bannersmanager_banner
set impmade=impmade+1
where id in(14615,14202,14203)166
(!!!!! 1421.9284057617): insert into jos_banners_delta values (14615,'2025-05-09 18:35:14','3.133.100.195','view'),(14202,'2025-05-09 18:35:14','3.133.100.195','view'),(14203,'2025-05-09 18:35:14','3.133.100.195','view')
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