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Photoacoustic Tomography Helps Detect Deep Cancer Cells

By MedImaging International staff writers
Posted on 16 Nov 2015
Image: Deep-tissue in vivo PAT genetic imaging of reversibly switchable BphP1 in a mouse brain (Photo courtesy of WUSTL).
Image: Deep-tissue in vivo PAT genetic imaging of reversibly switchable BphP1 in a mouse brain (Photo courtesy of WUSTL).
Genetically modifying glioblastoma cells with a bacterial phytochrome enables them to be identified as deep as one centimeter inside tissue using photoacoustic tomography (PAT).

Researchers at Washington University (WUSTL; St. Louis, MO, USA) and Albert Einstein College of Medicine (New York, NY, USA) successfully combined deep-penetration, high-resolution PAT with a BphP1, a reversibly switchable, phytochrome derived from Rhodopseudomonas palustris bacterium. Since BphP1 has the ability to differentiate between red and near-infrared (NIR) light-absorption states, the researchers took images of the modified cancerous tissue using the two types of light and compared them to get a highly sensitive, high-resolution image of the cancer cells.

Furthermore, the combined single-wavelength PAT and efficient BphP1 photo-switching between red and NIR states enabled differential imaging with substantially decreased background signals, enhanced detection sensitivity, increased penetration depth, and improved spatial resolution. This allowed the researchers to monitor tumor growth and metastasis with 100-μm resolution at depths approaching 10 mm and image individual cancer cells with a sub-optical diffraction resolution of about 140 nm. The study was published on November 9, 2015, in Nature Methods.

“This technique is extremely useful for cancer imaging. When we first look at the early-stage cancer, cancer tissue does not differ much from the background, healthy tissue; because the abundant blood gives strong signals, the cancer cells don't stand out,” said lead author biomedical engineer Junjie Yao, PhD, of WUSTL. “Now, with this new technology, we can see cancer cells in a tiny bit of tissue when the cancer is small.”

“Genetic encoding of the protein allows us to image and track targeted biological processes deep in tissue. The optical switching property of the protein enables new imaging capability,” said senior author Lihong Wang, PhD, of WUSTL. “This technology provides a promising new tool to biologists for high-resolution, deep imaging of cancer with genetic specificity as well as for drug screening in living tissue.”

PAT of genetically encoded probes allows for imaging of targeted biological processes deep in tissues with high spatial resolution; however, high background signals from blood can limit the achievable detection sensitivity.

Related Links:

Washington University
Albert Einstein College of Medicine


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92 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
93 (31.232833862305): SELECT show_live FROM jos_com_show_setting LIMIT 1
94 (38.14697265625): SELECT show_live FROM jos_com_show_setting LIMIT 1
95 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
96 (35.04753112793): SELECT show_live FROM jos_com_show_setting LIMIT 1
97 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
98 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
99 (27.894973754883): SELECT show_live FROM jos_com_show_setting LIMIT 1
100 (26.941299438477): SELECT show_live FROM jos_com_show_setting LIMIT 1
101 (30.040740966797): SELECT show_live FROM jos_com_show_setting LIMIT 1
102 (27.179718017578): SELECT show_live FROM jos_com_show_setting LIMIT 1
103 (28.133392333984): SELECT show_live FROM jos_com_show_setting LIMIT 1
104 (69.856643676758): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
105 (43.869018554688): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
106 (257.96890258789): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
107 (236.03439331055): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
108 (91.075897216797): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
109 (46.968460083008): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
110 (82.969665527344): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
111 (494.95697021484): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
112 (694.99015808105): 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 (505.92422485352): 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 (92.029571533203): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
115 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
116 (63.896179199219): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
117 (37.908554077148): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
118 (43.153762817383): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
119 (38.862228393555): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
120 (61.988830566406): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
121 (46.014785766602): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
122 (205.03997802734): SELECT * FROM trending_articles WHERE `journal_id` = 10 AND `timestamp` <= NOW() + INTERVAL 7 DAY ORDER BY `order`
123 (!!!!! 45147.895812988): 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 (418.90144348145): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294761348 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294761348 AND type='deeppockets_item' AND published='1' LIMIT 1
125 (!!!!! 29287.099838257): ( 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 (83.92333984375): ( 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 (229.1202545166): 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 (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
129 (149.01161193848): 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 (35.04753112793): 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 (133.99124145508): 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 (446.08116149902): 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 (966.07208251953): 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 (96.08268737793): 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 (499.01008605957): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
136 (612.97416687012): SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
137 (287.05596923828): SELECT name FROM jos_deeppockets WHERE id=215
138 (78.201293945312): SELECT name FROM jos_deeppockets WHERE id=215
139 (!!!!! 1384.973526001): 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((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
140 (531.91184997559): SELECT *, DATE_FORMAT(publish_up,'%d %b %Y') AS date_publish_up, DATE_FORMAT(publish_down,'%d %b %Y') AS date_publish_down FROM jos_events WHERE state=1 AND publish_up > NOW() and extra_info REGEXP '((;)|(^))215((;)|($))' AND catid IN (0,110) ORDER BY publish_up ASC LIMIT 3
141 (163.07830810547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
142 (71.048736572266): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
143 (!!!!! 7034.0633392334): TRUNCATE TABLE jos_trademed_module
144 (398.15902709961): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
145 (758.88633728027): 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=294761348 AND (dp.type='deeppockets_item' OR dp.type='deeppockets_item_link') AND dp.published='1' LIMIT 1
146 (411.9873046875): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
147 (47.922134399414): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND (type='deeppockets_item' OR type='deeppockets_item_link') AND published='1' LIMIT 1
148 (72.956085205078): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
149 (52.928924560547): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
150 (!!!!! 1215.934753418): 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 (66.995620727539): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
152 (42.915344238281): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
153 (32.901763916016): SELECT fid FROM jos_deeppockets WHERE cat=10 AND id=294761348 AND type='deeppockets_item' AND published='1' union SELECT fid FROM jos_deeppockets_archive WHERE cat=10 AND id=294761348 AND type='deeppockets_item' AND published='1' LIMIT 1
154 (34.093856811523): 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 (26.941299438477): 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 (28.848648071289): SELECT livesite FROM jos_dp_categories WHERE id=10 AND published='1' LIMIT 1
157 (56.982040405273): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
158 (41.007995605469): SELECT * FROM jos_deeppockets WHERE 1=1 AND id=294761348 AND published='1' union SELECT * FROM jos_deeppockets_archive WHERE 1=1 AND id=294761348 AND published='1' LIMIT 1
159 (96.797943115234): select jos_twitters.link from jos_twitters where cat=10
160 (29.087066650391): select jos_facebook.link from jos_facebook where cat=10
161 (28.133392333984): select jos_google_plus.link from jos_google_plus where cat=10
162 (355.00526428223): select jos_linkedin.link from jos_linkedin where cat=10
163 (464.91622924805): update jos_bannersmanager_banner set impmade=impmade+1 where id in(14202,14203)
164 (!!!!! 2833.1279754639): insert into jos_banners_delta values (14202,'2025-06-23 02:05:36','216.73.216.120','view'),(14203,'2025-06-23 02:05:36','216.73.216.120','view')